Merge branch 'master' of https://github.com/eugenp/tutorials

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 Eugen Paraschiv
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,9 +1,14 @@
 
 The "REST with Spring" Classes
 ==============================
+
 After 5 months of work, here's the Master Class of REST With Spring: <br/>
 **[>> THE REST WITH SPRING MASTER CLASS](http://www.baeldung.com/rest-with-spring-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=rws#master-class)**
 
+And here's the Master Class of Learn Spring Security: <br/>
+**[>> LEARN SPRING SECURITY MASTER CLASS](http://www.baeldung.com/learn-spring-security-course?utm_source=github&utm_medium=social&utm_content=tutorials&utm_campaign=lss#master-class)**
+
+
 
 Spring Tutorials
 ================

apache-poi/src/main/java/com/baeldung/poi/powerpoint/PowerPointHelper.java

@@ -0,0 +1,224 @@
+package com.baeldung.poi.powerpoint;
+
+import org.apache.poi.sl.usermodel.AutoNumberingScheme;
+import org.apache.poi.sl.usermodel.PictureData;
+import org.apache.poi.sl.usermodel.TableCell;
+import org.apache.poi.sl.usermodel.TextParagraph;
+import org.apache.poi.util.IOUtils;
+import org.apache.poi.xslf.usermodel.*;
+
+import java.awt.*;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper class for the PowerPoint presentation creation
+ */
+public class PowerPointHelper {
+
+    /**
+     * Read an existing presentation
+     *
+     * @param fileLocation
+     *            File location of the presentation
+     * @return instance of {@link XMLSlideShow}
+     * @throws IOException
+     */
+    public XMLSlideShow readingExistingSlideShow(String fileLocation) throws IOException {
+        return new XMLSlideShow(new FileInputStream(fileLocation));
+    }
+
+    /**
+     * Create a sample presentation
+     *
+     * @param fileLocation
+     *            File location of the presentation
+     * @throws IOException
+     */
+    public void createPresentation(String fileLocation) throws IOException {
+        // Create presentation
+        XMLSlideShow ppt = new XMLSlideShow();
+
+        XSLFSlideMaster defaultMaster = ppt.getSlideMasters().get(0);
+
+        // Retriving the slide layout
+        XSLFSlideLayout layout = defaultMaster.getLayout(SlideLayout.TITLE_ONLY);
+
+        // Creating the 1st slide
+        XSLFSlide slide1 = ppt.createSlide(layout);
+        XSLFTextShape title = slide1.getPlaceholder(0);
+        // Clearing text to remove the predefined one in the template
+        title.clearText();
+        XSLFTextParagraph p = title.addNewTextParagraph();
+
+        XSLFTextRun r1 = p.addNewTextRun();
+        r1.setText("Baeldung");
+        r1.setFontColor(new Color(78, 147, 89));
+        r1.setFontSize(48.);
+
+        // Add Image
+        ClassLoader classLoader = getClass().getClassLoader();
+        byte[] pictureData = IOUtils.toByteArray(new FileInputStream(classLoader.getResource("logo-leaf.png").getFile()));
+
+        XSLFPictureData pd = ppt.addPicture(pictureData, PictureData.PictureType.PNG);
+        XSLFPictureShape picture = slide1.createPicture(pd);
+        picture.setAnchor(new Rectangle(320, 230, 100, 92));
+
+        // Creating 2nd slide
+        layout = defaultMaster.getLayout(SlideLayout.TITLE_AND_CONTENT);
+        XSLFSlide slide2 = ppt.createSlide(layout);
+
+        // setting the tile
+        title = slide2.getPlaceholder(0);
+        title.clearText();
+        XSLFTextRun r = title.addNewTextParagraph().addNewTextRun();
+        r.setText("Baeldung");
+
+        // Adding the link
+        XSLFHyperlink link = r.createHyperlink();
+        link.setAddress("http://www.baeldung.com");
+
+        // setting the content
+        XSLFTextShape content = slide2.getPlaceholder(1);
+        content.clearText(); // unset any existing text
+        content.addNewTextParagraph().addNewTextRun().setText("First paragraph");
+        content.addNewTextParagraph().addNewTextRun().setText("Second paragraph");
+        content.addNewTextParagraph().addNewTextRun().setText("Third paragraph");
+
+        // Creating 3rd slide - List
+        layout = defaultMaster.getLayout(SlideLayout.TITLE_AND_CONTENT);
+        XSLFSlide slide3 = ppt.createSlide(layout);
+        title = slide3.getPlaceholder(0);
+        title.clearText();
+        r = title.addNewTextParagraph().addNewTextRun();
+        r.setText("Lists");
+
+        content = slide3.getPlaceholder(1);
+        content.clearText();
+        XSLFTextParagraph p1 = content.addNewTextParagraph();
+        p1.setIndentLevel(0);
+        p1.setBullet(true);
+        r1 = p1.addNewTextRun();
+        r1.setText("Bullet");
+
+        // the next three paragraphs form an auto-numbered list
+        XSLFTextParagraph p2 = content.addNewTextParagraph();
+        p2.setBulletAutoNumber(AutoNumberingScheme.alphaLcParenRight, 1);
+        p2.setIndentLevel(1);
+        XSLFTextRun r2 = p2.addNewTextRun();
+        r2.setText("Numbered List Item - 1");
+
+        // Creating 4th slide
+        XSLFSlide slide4 = ppt.createSlide();
+        createTable(slide4);
+
+        // Save presentation
+        FileOutputStream out = new FileOutputStream(fileLocation);
+        ppt.write(out);
+        out.close();
+
+        // Closing presentation
+        ppt.close();
+    }
+
+    /**
+     * Delete a slide from the presentation
+     *
+     * @param ppt
+     *            The presentation
+     * @param slideNumber
+     *            The number of the slide to be deleted (0-based)
+     */
+    public void deleteSlide(XMLSlideShow ppt, int slideNumber) {
+        ppt.removeSlide(slideNumber);
+    }
+
+    /**
+     * Re-order the slides inside a presentation
+     *
+     * @param ppt
+     *            The presentation
+     * @param slideNumber
+     *            The number of the slide to move
+     * @param newSlideNumber
+     *            The new position of the slide (0-base)
+     */
+    public void reorderSlide(XMLSlideShow ppt, int slideNumber, int newSlideNumber) {
+        List<XSLFSlide> slides = ppt.getSlides();
+
+        XSLFSlide secondSlide = slides.get(slideNumber);
+        ppt.setSlideOrder(secondSlide, newSlideNumber);
+    }
+
+    /**
+     * Retrieve the placeholder inside a slide
+     * 
+     * @param slide 
+     *          The slide
+     * @return List of placeholder inside a slide
+     */
+    public List<XSLFShape> retrieveTemplatePlaceholders(XSLFSlide slide) {
+        List<XSLFShape> placeholders = new ArrayList<>();
+
+        for (XSLFShape shape : slide.getShapes()) {
+            if (shape instanceof XSLFAutoShape) {
+                placeholders.add(shape);
+            }
+        }
+        return placeholders;
+    }
+
+    /**
+     * Create a table
+     *
+     * @param slide
+     *            Slide
+     */
+    private void createTable(XSLFSlide slide) {
+
+        XSLFTable tbl = slide.createTable();
+        tbl.setAnchor(new Rectangle(50, 50, 450, 300));
+
+        int numColumns = 3;
+        int numRows = 5;
+
+        // header
+        XSLFTableRow headerRow = tbl.addRow();
+        headerRow.setHeight(50);
+        for (int i = 0; i < numColumns; i++) {
+            XSLFTableCell th = headerRow.addCell();
+            XSLFTextParagraph p = th.addNewTextParagraph();
+            p.setTextAlign(TextParagraph.TextAlign.CENTER);
+            XSLFTextRun r = p.addNewTextRun();
+            r.setText("Header " + (i + 1));
+            r.setBold(true);
+            r.setFontColor(Color.white);
+            th.setFillColor(new Color(79, 129, 189));
+            th.setBorderWidth(TableCell.BorderEdge.bottom, 2.0);
+            th.setBorderColor(TableCell.BorderEdge.bottom, Color.white);
+            // all columns are equally sized
+            tbl.setColumnWidth(i, 150);
+        }
+
+        // data
+        for (int rownum = 0; rownum < numRows; rownum++) {
+            XSLFTableRow tr = tbl.addRow();
+            tr.setHeight(50);
+            for (int i = 0; i < numColumns; i++) {
+                XSLFTableCell cell = tr.addCell();
+                XSLFTextParagraph p = cell.addNewTextParagraph();
+                XSLFTextRun r = p.addNewTextRun();
+
+                r.setText("Cell " + (i * rownum + 1));
+                if (rownum % 2 == 0) {
+                    cell.setFillColor(new Color(208, 216, 232));
+                } else {
+                    cell.setFillColor(new Color(233, 247, 244));
+                }
+            }
+        }
+    }
+}

apache-poi/src/test/java/com/baeldung/poi/powerpoint/PowerPointIntegrationTest.java

@@ -0,0 +1,77 @@
+package com.baeldung.poi.powerpoint;
+
+import org.apache.poi.xslf.usermodel.XMLSlideShow;
+import org.apache.poi.xslf.usermodel.XSLFShape;
+import org.apache.poi.xslf.usermodel.XSLFSlide;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.File;
+import java.util.List;
+
+public class PowerPointIntegrationTest {
+
+    private PowerPointHelper pph;
+    private String fileLocation;
+    private static final String FILE_NAME = "presentation.pptx";
+
+    @Before
+    public void setUp() throws Exception {
+        File currDir = new File(".");
+        String path = currDir.getAbsolutePath();
+        fileLocation = path.substring(0, path.length() - 1) + FILE_NAME;
+
+        pph = new PowerPointHelper();
+        pph.createPresentation(fileLocation);
+    }
+
+    @Test
+    public void whenReadingAPresentation_thenOK() throws Exception {
+        XMLSlideShow xmlSlideShow = pph.readingExistingSlideShow(fileLocation);
+
+        Assert.assertNotNull(xmlSlideShow);
+        Assert.assertEquals(4, xmlSlideShow.getSlides().size());
+    }
+
+    @Test
+    public void whenRetrievingThePlaceholdersForEachSlide_thenOK() throws Exception {
+        XMLSlideShow xmlSlideShow = pph.readingExistingSlideShow(fileLocation);
+
+        List<XSLFShape> onlyTitleSlidePlaceholders = pph.retrieveTemplatePlaceholders(xmlSlideShow.getSlides().get(0));
+        List<XSLFShape> titleAndBodySlidePlaceholders = pph.retrieveTemplatePlaceholders(xmlSlideShow.getSlides().get(1));
+        List<XSLFShape> emptySlidePlaceholdes = pph.retrieveTemplatePlaceholders(xmlSlideShow.getSlides().get(3));
+
+        Assert.assertEquals(1, onlyTitleSlidePlaceholders.size());
+        Assert.assertEquals(2, titleAndBodySlidePlaceholders.size());
+        Assert.assertEquals(0, emptySlidePlaceholdes.size());
+
+    }
+
+    @Test
+    public void whenSortingSlides_thenOK() throws Exception {
+        XMLSlideShow xmlSlideShow = pph.readingExistingSlideShow(fileLocation);
+        XSLFSlide slide4 = xmlSlideShow.getSlides().get(3);
+        pph.reorderSlide(xmlSlideShow, 3, 1);
+
+        Assert.assertEquals(slide4, xmlSlideShow.getSlides().get(1));
+    }
+
+    @Test
+    public void givenPresentation_whenDeletingASlide_thenOK() throws Exception {
+        XMLSlideShow xmlSlideShow = pph.readingExistingSlideShow(fileLocation);
+        pph.deleteSlide(xmlSlideShow, 3);
+
+        Assert.assertEquals(3, xmlSlideShow.getSlides().size());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        File testFile = new File(fileLocation);
+        if (testFile.exists()) {
+            testFile.delete();
+        }
+        pph = null;
+    }
+}

bootique/dependency-reduced-pom.xml

@@ -28,8 +28,14 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>3.8.1</version>
+      <version>4.12</version>
       <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <artifactId>hamcrest-core</artifactId>
+          <groupId>org.hamcrest</groupId>
+        </exclusion>
+      </exclusions>
     </dependency>
   </dependencies>
   <dependencyManagement>

cas/cas-secured-app/README.md

@@ -0,0 +1,2 @@
+## Relevant articles:
+- [CAS SSO With Spring Security](http://www.baeldung.com/spring-security-cas-sso)

cas/cas-secured-app/pom.xml

@@ -14,7 +14,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.0.0.BUILD-SNAPSHOT</version>
+		<version>2.0.0.M7</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
@@ -87,14 +87,6 @@
 	</build>
 
 	<repositories>
-		<repository>
-			<id>spring-snapshots</id>
-			<name>Spring Snapshots</name>
-			<url>https://repo.spring.io/snapshot</url>
-			<snapshots>
-				<enabled>true</enabled>
-			</snapshots>
-		</repository>
 		<repository>
 			<id>spring-milestones</id>
 			<name>Spring Milestones</name>
@@ -106,14 +98,6 @@
 	</repositories>
 
 	<pluginRepositories>
-		<pluginRepository>
-			<id>spring-snapshots</id>
-			<name>Spring Snapshots</name>
-			<url>https://repo.spring.io/snapshot</url>
-			<snapshots>
-				<enabled>true</enabled>
-			</snapshots>
-		</pluginRepository>
 		<pluginRepository>
 			<id>spring-milestones</id>
 			<name>Spring Milestones</name>

cas/cas-secured-app/src/main/java/com/baeldung/cassecuredapp/controllers/AuthController.java

@@ -1,6 +1,7 @@
 package com.baeldung.cassecuredapp.controllers;
 
-import org.apache.log4j.Logger;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.security.web.authentication.logout.CookieClearingLogoutHandler;
@@ -15,7 +16,7 @@ import javax.servlet.http.HttpServletResponse;
 @Controller
 public class AuthController {
 
-    private Logger logger = Logger.getLogger(AuthController.class);
+    private Logger logger = LogManager.getLogger(AuthController.class);
 
     @GetMapping("/logout")
     public String logout(

core-java-8/README.md

@@ -30,3 +30,6 @@
 - [The Difference Between map() and flatMap()](http://www.baeldung.com/java-difference-map-and-flatmap)
 - [Merging Streams in Java](http://www.baeldung.com/java-merge-streams)
 - [“Stream has already been operated upon or closed” Exception in Java](http://www.baeldung.com/java-stream-operated-upon-or-closed-exception)
+- [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
+- [Copy a File with Java](http://www.baeldung.com/java-copy-file)
+- [Generating Prime Numbers in Java](http://www.baeldung.com/java-generate-prime-numbers)

core-java-8/pom.xml

@@ -83,6 +83,24 @@
             <scope>test</scope>
         </dependency>
         
+        <dependency>
+		    <groupId>org.openjdk.jmh</groupId>
+		    <artifactId>jmh-core</artifactId>
+		    <version>1.19</version>
+		</dependency>
+		
+		<dependency>
+		    <groupId>org.openjdk.jmh</groupId>
+		    <artifactId>jmh-generator-annprocess</artifactId>
+		    <version>1.19</version>
+		</dependency>
+		
+		<dependency>
+		    <groupId>org.openjdk.jmh</groupId>
+		    <artifactId>jmh-generator-bytecode</artifactId>
+		    <version>1.19</version>
+		</dependency>
+
     </dependencies>
 
     <build>

core-java-8/src/main/java/com/baeldung/annotations/ClassWithAnnotation.java

@@ -0,0 +1,5 @@
+package com.baeldung.annotations;
+
+@Deprecated
+class ClassWithAnnotation {
+}

core-java-8/src/main/java/com/baeldung/annotations/ClassWithDeprecatedMethod.java

@@ -0,0 +1,9 @@
+package com.baeldung.annotations;
+
+class ClassWithDeprecatedMethod {
+
+    @Deprecated
+    static void deprecatedMethod() {
+
+    }
+}

core-java-8/src/main/java/com/baeldung/annotations/ClassWithSafeVarargs.java

@@ -0,0 +1,11 @@
+package com.baeldung.annotations;
+
+class ClassWithSafeVarargs<T> {
+
+    @SafeVarargs
+    final void iterateOverVarargs(T... args) {
+        for (T x : args) {
+            // do stuff with x
+        }
+    }
+}

core-java-8/src/main/java/com/baeldung/annotations/ClassWithSuppressWarnings.java

@@ -0,0 +1,9 @@
+package com.baeldung.annotations;
+
+class ClassWithSuppressWarnings {
+
+    @SuppressWarnings("deprecation")
+    void useDeprecatedMethod() {
+        ClassWithDeprecatedMethod.deprecatedMethod(); // no warning is generated here
+    }
+}

core-java-8/src/main/java/com/baeldung/annotations/IntConsumer.java

@@ -0,0 +1,8 @@
+package com.baeldung.annotations;
+
+@FunctionalInterface
+interface IntConsumer {
+
+    void accept(Integer number);
+
+}

core-java-8/src/main/java/com/baeldung/annotations/Interval.java

@@ -0,0 +1,8 @@
+package com.baeldung.annotations;
+
+import java.lang.annotation.Repeatable;
+
+@Repeatable(Intervals.class)
+@interface Interval {
+    int hour() default 1;
+}

core-java-8/src/main/java/com/baeldung/annotations/IntervalUsage.java

@@ -0,0 +1,9 @@
+package com.baeldung.annotations;
+
+public class IntervalUsage {
+
+    @Interval(hour = 17)
+    @Interval(hour = 13)
+    void doPeriodicCleanup() {
+    }
+}

core-java-8/src/main/java/com/baeldung/annotations/Intervals.java

@@ -0,0 +1,5 @@
+package com.baeldung.annotations;
+
+@interface Intervals {
+    Interval[] value();
+}

core-java-8/src/main/java/com/baeldung/annotations/MyAnnotation.java

@@ -0,0 +1,11 @@
+package com.baeldung.annotations;
+
+import java.lang.annotation.*;
+
+@Inherited
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.LOCAL_VARIABLE, ElementType.FIELD})
+@interface MyAnnotation {
+
+}

core-java-8/src/main/java/com/baeldung/annotations/MyAnnotationTarget.java

@@ -0,0 +1,16 @@
+package com.baeldung.annotations;
+
+class MyAnnotationTarget {
+
+    // this is OK
+    @MyAnnotation
+    String someField;
+
+    // @MyAnnotation <- this is invalid usage!
+    void doSomething() {
+
+        // this also works
+        @MyAnnotation
+        String localVariable;
+    }
+}

core-java-8/src/main/java/com/baeldung/annotations/MyOperation.java

@@ -0,0 +1,6 @@
+package com.baeldung.annotations;
+
+interface MyOperation {
+
+    void perform();
+}

core-java-8/src/main/java/com/baeldung/annotations/MyOperationImpl.java

@@ -0,0 +1,9 @@
+package com.baeldung.annotations;
+
+class MyOperationImpl implements MyOperation {
+
+    @Override
+    public void perform() {
+
+    }
+}

core-java-8/src/main/java/com/baeldung/datetime/DateToLocalDateConverter.java

@@ -1,35 +0,0 @@
-/**
- * 
- */
-package com.baeldung.datetime;
-
-import java.time.Instant;
-import java.time.LocalDate;
-import java.time.ZoneId;
-import java.util.Date;
-
-/**
- * Class which shows different ways of converting java.util.Date into java.time.LocalDate.
- * 
- * @author abialas
- *
- */
-public class DateToLocalDateConverter {
-
-    public static LocalDate convertToLocalDateViaInstant(Date dateToConvert) {
-        return dateToConvert.toInstant()
-            .atZone(ZoneId.systemDefault())
-            .toLocalDate();
-    }
-
-    public static LocalDate convertToLocalDateViaSqlDate(Date dateToConvert) {
-        return new java.sql.Date(dateToConvert.getTime()).toLocalDate();
-    }
-
-    public static LocalDate convertToLocalDateViaMilisecond(Date dateToConvert) {
-        return Instant.ofEpochMilli(dateToConvert.getTime())
-            .atZone(ZoneId.systemDefault())
-            .toLocalDate();
-    }
-
-}

core-java-8/src/main/java/com/baeldung/datetime/DateToLocalDateTimeConverter.java

@@ -1,35 +0,0 @@
-/**
- * 
- */
-package com.baeldung.datetime;
-
-import java.time.Instant;
-import java.time.LocalDateTime;
-import java.time.ZoneId;
-import java.util.Date;
-
-/**
- * Class which shows different ways of converting java.util.Date into java.time.LocalDateTime. 
- * 
- * @author abialas
- *
- */
-public class DateToLocalDateTimeConverter {
-
-    public static LocalDateTime convertToLocalDateTimeViaInstant(Date dateToConvert) {
-        return dateToConvert.toInstant()
-            .atZone(ZoneId.systemDefault())
-            .toLocalDateTime();
-    }
-
-    public static LocalDateTime convertToLocalDateTimeViaSqlTimestamp(Date dateToConvert) {
-        return new java.sql.Timestamp(dateToConvert.getTime()).toLocalDateTime();
-    }
-
-    public static LocalDateTime convertToLocalDateTimeViaMilisecond(Date dateToConvert) {
-        return Instant.ofEpochMilli(dateToConvert.getTime())
-            .atZone(ZoneId.systemDefault())
-            .toLocalDateTime();
-    }
-
-}

core-java-8/src/main/java/com/baeldung/timezonedisplay/TimezoneDisplay.java

@@ -0,0 +1,55 @@
+package com.baeldung.timezonedisplay;
+
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZoneOffset;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class TimezoneDisplay {
+
+    public enum OffsetBase {
+        GMT, UTC
+    }
+
+    public List<String> getTimeZoneList(OffsetBase base) {
+        Set<String> availableZoneIds = ZoneId.getAvailableZoneIds();
+
+        LocalDateTime now = LocalDateTime.now();
+        return availableZoneIds
+          .stream()
+          .map(ZoneId::of)
+          .sorted(new ZoneComparator())
+          .map(id -> String.format("(%s%s) %s", base, getOffset(now, id), id.getId()))
+          .collect(Collectors.toList());
+    }
+
+    private String getOffset(LocalDateTime dateTime, ZoneId id) {
+        return dateTime
+          .atZone(id)
+          .getOffset()
+          .getId()
+          .replace("Z", "+00:00");
+    }
+
+    private class ZoneComparator implements Comparator<ZoneId> {
+
+        @Override
+        public int compare(ZoneId zoneId1, ZoneId zoneId2) {
+            LocalDateTime now = LocalDateTime.now();
+
+            ZoneOffset offset1 = now
+              .atZone(zoneId1)
+              .getOffset();
+
+            ZoneOffset offset2 = now
+              .atZone(zoneId2)
+              .getOffset();
+
+            return offset1.compareTo(offset2);
+        }
+    }
+
+}

core-java-8/src/main/java/com/baeldung/timezonedisplay/TimezoneDisplayApp.java

@@ -0,0 +1,18 @@
+package com.baeldung.timezonedisplay;
+
+import java.util.List;
+
+public class TimezoneDisplayApp {
+
+    public static void main(String... args) {
+        TimezoneDisplay display = new TimezoneDisplay();
+
+        System.out.println("Time zones in UTC:");
+        List<String> utc = display.getTimeZoneList(TimezoneDisplay.OffsetBase.UTC);
+        utc.forEach(System.out::println);
+
+        System.out.println("Time zones in GMT:");
+        List<String> gmt = display.getTimeZoneList(TimezoneDisplay.OffsetBase.GMT);
+        gmt.forEach(System.out::println);
+    }
+}

core-java-8/src/test/java/com/baeldung/counter/CounterStatistics.java

@@ -0,0 +1,45 @@
+package com.baeldung.counter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Mode;
+
+import com.baeldung.counter.CounterUtil.MutableInteger;
+
+@Fork(value = 1, warmups = 3)
+@BenchmarkMode(Mode.All)
+public class CounterStatistics {
+
+    private static final Map<String, Integer> counterMap = new HashMap<>();
+    private static final Map<String, MutableInteger> counterWithMutableIntMap = new HashMap<>();
+    private static final Map<String, int[]> counterWithIntArrayMap = new HashMap<>();
+    private static final Map<String, Long> counterWithLongWrapperMap = new HashMap<>();
+
+    @Benchmark
+    public void wrapperAsCounter() {
+        CounterUtil.counterWithWrapperObject(counterMap);
+    }
+
+    @Benchmark
+    public void lambdaExpressionWithWrapper() {
+        CounterUtil.counterWithLambdaAndWrapper(counterWithLongWrapperMap);
+    }
+
+    @Benchmark
+    public void mutableIntegerAsCounter() {
+        CounterUtil.counterWithMutableInteger(counterWithMutableIntMap);
+    }
+
+    @Benchmark
+    public void primitiveArrayAsCounter() {
+        CounterUtil.counterWithPrimitiveArray(counterWithIntArrayMap);
+    }
+
+    public static void main(String[] args) throws Exception {
+        org.openjdk.jmh.Main.main(args);
+    }
+}

core-java-8/src/test/java/com/baeldung/counter/CounterTest.java

@@ -0,0 +1,53 @@
+package com.baeldung.counter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.baeldung.counter.CounterUtil.MutableInteger;
+
+public class CounterTest {
+
+    @Test
+    public void whenMapWithWrapperAsCounter_runsSuccessfully() {
+        Map<String, Integer> counterMap = new HashMap<>();
+        CounterUtil.counterWithWrapperObject(counterMap);
+
+        assertEquals(3, counterMap.get("China")
+            .intValue());
+        assertEquals(2, counterMap.get("India")
+            .intValue());
+    }
+
+    @Test
+    public void whenMapWithLambdaAndWrapperCounter_runsSuccessfully() {
+        Map<String, Long> counterMap = new HashMap<>();
+        CounterUtil.counterWithLambdaAndWrapper(counterMap);
+
+        assertEquals(3l, counterMap.get("China")
+            .longValue());
+        assertEquals(2l, counterMap.get("India")
+            .longValue());
+    }
+
+    @Test
+    public void whenMapWithMutableIntegerCounter_runsSuccessfully() {
+        Map<String, MutableInteger> counterMap = new HashMap<>();
+        CounterUtil.counterWithMutableInteger(counterMap);
+        assertEquals(3, counterMap.get("China")
+            .getCount());
+        assertEquals(2, counterMap.get("India")
+            .getCount());
+    }
+
+    @Test
+    public void whenMapWithPrimitiveArray_runsSuccessfully() {
+        Map<String, int[]> counterMap = new HashMap<>();
+        CounterUtil.counterWithPrimitiveArray(counterMap);
+        assertEquals(3, counterMap.get("China")[0]);
+        assertEquals(2, counterMap.get("India")[0]);
+    }
+}

core-java-8/src/test/java/com/baeldung/counter/CounterUtil.java

@@ -0,0 +1,61 @@
+package com.baeldung.counter;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CounterUtil {
+
+    private final static String[] COUNTRY_NAMES = { "China", "Australia", "India", "USA", "USSR", "UK", "China", "France", "Poland", "Austria", "India", "USA", "Egypt", "China" };
+
+    public static void counterWithWrapperObject(Map<String, Integer> counterMap) {
+        for (String country : COUNTRY_NAMES) {
+            counterMap.compute(country, (k, v) -> v == null ? 1 : v + 1);
+        }
+    }
+
+    public static void counterWithLambdaAndWrapper(Map<String, Long> counterMap) {
+        counterMap.putAll(Stream.of(COUNTRY_NAMES)
+            .parallel()
+            .collect(Collectors.groupingBy(k -> k, Collectors.counting())));
+    }
+
+    public static class MutableInteger {
+        int count;
+
+        public MutableInteger(int count) {
+            this.count = count;
+        }
+
+        public void increment() {
+            this.count++;
+        }
+
+        public int getCount() {
+            return this.count;
+        }
+    }
+
+    public static void counterWithMutableInteger(Map<String, MutableInteger> counterMap) {
+        for (String country : COUNTRY_NAMES) {
+            MutableInteger oldValue = counterMap.get(country);
+            if (oldValue != null) {
+                oldValue.increment();
+            } else {
+                counterMap.put(country, new MutableInteger(1));
+            }
+        }
+    }
+
+    public static void counterWithPrimitiveArray(Map<String, int[]> counterMap) {
+        for (String country : COUNTRY_NAMES) {
+            int[] oldCounter = counterMap.get(country);
+            if (oldCounter != null) {
+                oldCounter[0] += 1;
+            } else {
+                counterMap.put(country, new int[] { 1 });
+            }
+        }
+    }
+
+}

core-java-8/src/test/java/com/baeldung/datetime/DateToLocalDateConverterTest.java

@@ -1,72 +0,0 @@
-/**
- * 
- */
-package com.baeldung.datetime;
-
-import static org.junit.Assert.assertEquals;
-
-import java.time.LocalDate;
-import java.time.temporal.ChronoField;
-import java.util.Calendar;
-import java.util.Date;
-
-import org.junit.Test;
-
-/**
- * 
- * JUnits for {@link DateToLocalDateConverter} class.
- * 
- * @author abialas
- *
- */
-public class DateToLocalDateConverterTest {
-
-    @Test
-    public void shouldReturn10thNovember2010WhenConvertViaInstant() {
-        // given
-        Calendar calendar = Calendar.getInstance();
-        calendar.set(2010, 10, 10);
-        Date dateToConvert = calendar.getTime();
-
-        // when
-        LocalDate localDate = DateToLocalDateConverter.convertToLocalDateViaInstant(dateToConvert);
-
-        // then
-        assertEquals(2010, localDate.get(ChronoField.YEAR));
-        assertEquals(11, localDate.get(ChronoField.MONTH_OF_YEAR));
-        assertEquals(10, localDate.get(ChronoField.DAY_OF_MONTH));
-    }
-
-    @Test
-    public void shouldReturn10thNovember2010WhenConvertViaMiliseconds() {
-        // given
-        Calendar calendar = Calendar.getInstance();
-        calendar.set(2010, 10, 10);
-        Date dateToConvert = calendar.getTime();
-
-        // when
-        LocalDate localDate = DateToLocalDateConverter.convertToLocalDateViaMilisecond(dateToConvert);
-
-        // then
-        assertEquals(2010, localDate.get(ChronoField.YEAR));
-        assertEquals(11, localDate.get(ChronoField.MONTH_OF_YEAR));
-        assertEquals(10, localDate.get(ChronoField.DAY_OF_MONTH));
-    }
-
-    @Test
-    public void shouldReturn10thNovember2010WhenConvertViaSqlDate() {
-        // given
-        Calendar calendar = Calendar.getInstance();
-        calendar.set(2010, 10, 10);
-        Date dateToConvert = calendar.getTime();
-
-        // when
-        LocalDate localDate = DateToLocalDateConverter.convertToLocalDateViaSqlDate(dateToConvert);
-
-        // then
-        assertEquals(2010, localDate.get(ChronoField.YEAR));
-        assertEquals(11, localDate.get(ChronoField.MONTH_OF_YEAR));
-        assertEquals(10, localDate.get(ChronoField.DAY_OF_MONTH));
-    }
-
-}

core-java-8/src/test/java/com/baeldung/datetime/DateToLocalDateTimeConverterTest.java

@@ -1,78 +0,0 @@
-/**
- * 
- */
-package com.baeldung.datetime;
-
-import static org.junit.Assert.assertEquals;
-
-import java.time.LocalDateTime;
-import java.time.temporal.ChronoField;
-import java.util.Calendar;
-import java.util.Date;
-
-import org.junit.Test;
-
-/**
- * 
- * JUnits for {@link DateToLocalDateTimeConverter} class.
- * 
- * @author abialas
- *
- */
-public class DateToLocalDateTimeConverterTest {
-
-    @Test
-    public void shouldReturn10thNovember2010time8hour20minWhenConvertViaInstant() {
-        // given
-        Calendar calendar = Calendar.getInstance();
-        calendar.set(2010, 10, 10, 8, 20);
-        Date dateToConvert = calendar.getTime();
-
-        // when
-        LocalDateTime localDateTime = DateToLocalDateTimeConverter.convertToLocalDateTimeViaInstant(dateToConvert);
-
-        // then
-        assertEquals(2010, localDateTime.get(ChronoField.YEAR));
-        assertEquals(11, localDateTime.get(ChronoField.MONTH_OF_YEAR));
-        assertEquals(10, localDateTime.get(ChronoField.DAY_OF_MONTH));
-        assertEquals(8, localDateTime.get(ChronoField.HOUR_OF_DAY));
-        assertEquals(20, localDateTime.get(ChronoField.MINUTE_OF_HOUR));
-    }
-
-    @Test
-    public void shouldReturn10thNovember2010time8hour20minWhenConvertViaMiliseconds() {
-        // given
-        Calendar calendar = Calendar.getInstance();
-        calendar.set(2010, 10, 10, 8, 20);
-        Date dateToConvert = calendar.getTime();
-
-        // when
-        LocalDateTime localDateTime = DateToLocalDateTimeConverter.convertToLocalDateTimeViaMilisecond(dateToConvert);
-
-        // then
-        assertEquals(2010, localDateTime.get(ChronoField.YEAR));
-        assertEquals(11, localDateTime.get(ChronoField.MONTH_OF_YEAR));
-        assertEquals(10, localDateTime.get(ChronoField.DAY_OF_MONTH));
-        assertEquals(8, localDateTime.get(ChronoField.HOUR_OF_DAY));
-        assertEquals(20, localDateTime.get(ChronoField.MINUTE_OF_HOUR));
-    }
-
-    @Test
-    public void shouldReturn10thNovember2010time8hour20minWhenConvertViaSqlTimestamp() {
-        // given
-        Calendar calendar = Calendar.getInstance();
-        calendar.set(2010, 10, 10, 8, 20);
-        Date dateToConvert = calendar.getTime();
-
-        // when
-        LocalDateTime localDateTime = DateToLocalDateTimeConverter.convertToLocalDateTimeViaSqlTimestamp(dateToConvert);
-
-        // then
-        assertEquals(2010, localDateTime.get(ChronoField.YEAR));
-        assertEquals(11, localDateTime.get(ChronoField.MONTH_OF_YEAR));
-        assertEquals(10, localDateTime.get(ChronoField.DAY_OF_MONTH));
-        assertEquals(8, localDateTime.get(ChronoField.HOUR_OF_DAY));
-        assertEquals(20, localDateTime.get(ChronoField.MINUTE_OF_HOUR));
-    }
-
-}

core-java-9/README.md

@@ -18,3 +18,4 @@
 - [How to Get All Dates Between Two Dates?](http://www.baeldung.com/java-between-dates)
 - [Java 9 java.util.Objects Additions](http://www.baeldung.com/java-9-objects-new)
 - [Compact Strings in Java 9](http://www.baeldung.com/java-9-compact-string)
+- [Convert Date to LocalDate or LocalDateTime and Back](http://www.baeldung.com/java-date-to-localdate-and-localdatetime)

core-java-9/compile-httpclient.bat

@@ -0,0 +1,3 @@
+javac --module-path mods -d mods/com.baeldung.httpclient^
+ src/modules/com.baeldung.httpclient/module-info.java^
+ src/modules/com.baeldung.httpclient/com/baeldung/httpclient/HttpClientExample.java

core-java-9/run-httpclient.bat

@@ -0,0 +1 @@
+java --module-path mods -m com.baeldung.httpclient/com.baeldung.httpclient.HttpClientExample

core-java-9/src/main/java/com/baeldung/java9/datetime/DateToLocalDateConverter.java

@@ -3,18 +3,35 @@
  */
 package com.baeldung.java9.datetime;
 
+import java.time.Instant;
 import java.time.LocalDate;
 import java.time.ZoneId;
 import java.util.Date;
 
 /**
- * Class which shows a way to convert java.util.Date into java.time.LocalDate with new Java 1.9.
+ * Class which shows a way to convert java.util.Date into java.time.LocalDate.
  * 
  * @author abialas
  *
  */
 public class DateToLocalDateConverter {
 
+    public static LocalDate convertToLocalDateViaInstant(Date dateToConvert) {
+        return dateToConvert.toInstant()
+            .atZone(ZoneId.systemDefault())
+            .toLocalDate();
+    }
+
+    public static LocalDate convertToLocalDateViaSqlDate(Date dateToConvert) {
+        return new java.sql.Date(dateToConvert.getTime()).toLocalDate();
+    }
+
+    public static LocalDate convertToLocalDateViaMilisecond(Date dateToConvert) {
+        return Instant.ofEpochMilli(dateToConvert.getTime())
+            .atZone(ZoneId.systemDefault())
+            .toLocalDate();
+    }
+
     public static LocalDate convertToLocalDate(Date dateToConvert) {
         return LocalDate.ofInstant(dateToConvert.toInstant(), ZoneId.systemDefault());
     }

core-java-9/src/main/java/com/baeldung/java9/datetime/DateToLocalDateTimeConverter.java

@@ -3,18 +3,35 @@
  */
 package com.baeldung.java9.datetime;
 
+import java.time.Instant;
 import java.time.LocalDateTime;
 import java.time.ZoneId;
 import java.util.Date;
 
 /**
- * Class which shows a way to convert java.util.Date into java.time.LocalDateTime with new Java 1.9.
+ * Class which shows a way to convert java.util.Date into java.time.LocalDateTime.
  * 
  * @author abialas
  *
  */
 public class DateToLocalDateTimeConverter {
 
+    public static LocalDateTime convertToLocalDateTimeViaInstant(Date dateToConvert) {
+        return dateToConvert.toInstant()
+            .atZone(ZoneId.systemDefault())
+            .toLocalDateTime();
+    }
+
+    public static LocalDateTime convertToLocalDateTimeViaSqlTimestamp(Date dateToConvert) {
+        return new java.sql.Timestamp(dateToConvert.getTime()).toLocalDateTime();
+    }
+
+    public static LocalDateTime convertToLocalDateTimeViaMilisecond(Date dateToConvert) {
+        return Instant.ofEpochMilli(dateToConvert.getTime())
+            .atZone(ZoneId.systemDefault())
+            .toLocalDateTime();
+    }
+
     public static LocalDateTime convertToLocalDateTime(Date dateToConvert) {
         return LocalDateTime.ofInstant(dateToConvert.toInstant(), ZoneId.systemDefault());
     }

core-java-9/src/main/java/com/baeldung/java9/datetime/LocalDateTimeToDateConverter.java

@@ -1,7 +1,7 @@
 /**
  * 
  */
-package com.baeldung.datetime;
+package com.baeldung.java9.datetime;
 
 import java.time.LocalDateTime;
 import java.time.ZoneId;

core-java-9/src/main/java/com/baeldung/java9/datetime/LocalDateToDateConverter.java

@@ -1,7 +1,7 @@
 /**
  * 
  */
-package com.baeldung.datetime;
+package com.baeldung.java9.datetime;
 
 import java.time.LocalDate;
 import java.time.ZoneId;

core-java-9/src/modules/com.baeldung.httpclient/com/baeldung/httpclient/HttpClientExample.java

@@ -0,0 +1,84 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.httpclient;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+import jdk.incubator.http.HttpClient;
+import jdk.incubator.http.HttpRequest;
+import jdk.incubator.http.HttpRequest.BodyProcessor;
+import jdk.incubator.http.HttpResponse;
+import jdk.incubator.http.HttpResponse.BodyHandler;
+
+/**
+ *
+ * @author pkaria
+ */
+public class HttpClientExample {
+    
+    public static void main(String[] args) throws Exception {
+        httpGetRequest();
+        httpPostRequest();
+        asynchronousRequest();
+        asynchronousMultipleRequests();
+    }
+
+    public static void httpGetRequest() throws URISyntaxException, IOException, InterruptedException {
+        HttpClient client = HttpClient.newHttpClient();
+        URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
+        HttpRequest request = HttpRequest.newBuilder(httpURI).GET()
+          .headers("Accept-Enconding", "gzip, deflate").build();
+        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandler.asString());
+        String responseBody = response.body();
+        int responseStatusCode = response.statusCode();
+        System.out.println(responseBody);
+    }
+
+    public static void httpPostRequest() throws URISyntaxException, IOException, InterruptedException {
+        HttpClient client = HttpClient
+                .newBuilder()
+                .build();
+        HttpRequest request = HttpRequest
+                .newBuilder(new URI("http://jsonplaceholder.typicode.com/posts"))
+                .POST(BodyProcessor.fromString("Sample Post Request"))
+                .build();
+        HttpResponse<String> response
+                = client.send(request, HttpResponse.BodyHandler.asString());
+        String responseBody = response.body();
+        System.out.println(responseBody);
+    }
+
+    public static void asynchronousRequest() throws URISyntaxException {
+        HttpClient client = HttpClient.newHttpClient();
+        URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
+        HttpRequest request = HttpRequest.newBuilder(httpURI).GET().build();
+        CompletableFuture<HttpResponse<String>> futureResponse = client.sendAsync(request,
+                HttpResponse.BodyHandler.asString());
+    }
+
+    public static void asynchronousMultipleRequests() throws URISyntaxException {
+        List<URI> targets = Arrays.asList(new URI("http://jsonplaceholder.typicode.com/posts/1"), new URI("http://jsonplaceholder.typicode.com/posts/2"));
+        HttpClient client = HttpClient.newHttpClient();
+        List<CompletableFuture<File>> futures = targets
+                .stream()
+                .map(target -> client
+                .sendAsync(
+                        HttpRequest.newBuilder(target)
+                                .GET()
+                                .build(),
+                        BodyHandler.asFile(Paths.get("base", target.getPath())))
+                .thenApply(response -> response.body())
+                .thenApply(path -> path.toFile()))
+                .collect(Collectors.toList());
+    }
+}

core-java-9/src/modules/com.baeldung.httpclient/module-info.java

@@ -0,0 +1,3 @@
+module com.baeldung.httpclient {   
+	requires jdk.incubator.httpclient;
+}

core-java-9/src/test/java/com/baeldung/java9/datetime/DateToLocalDateConverterTest.java

@@ -22,6 +22,54 @@ import com.baeldung.java9.datetime.DateToLocalDateConverter;
  */
 public class DateToLocalDateConverterTest {
 
+    @Test
+    public void shouldReturn10thNovember2010WhenConvertViaInstant() {
+        // given
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2010, 10, 10);
+        Date dateToConvert = calendar.getTime();
+
+        // when
+        LocalDate localDate = DateToLocalDateConverter.convertToLocalDateViaInstant(dateToConvert);
+
+        // then
+        assertEquals(2010, localDate.get(ChronoField.YEAR));
+        assertEquals(11, localDate.get(ChronoField.MONTH_OF_YEAR));
+        assertEquals(10, localDate.get(ChronoField.DAY_OF_MONTH));
+    }
+
+    @Test
+    public void shouldReturn10thNovember2010WhenConvertViaMiliseconds() {
+        // given
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2010, 10, 10);
+        Date dateToConvert = calendar.getTime();
+
+        // when
+        LocalDate localDate = DateToLocalDateConverter.convertToLocalDateViaMilisecond(dateToConvert);
+
+        // then
+        assertEquals(2010, localDate.get(ChronoField.YEAR));
+        assertEquals(11, localDate.get(ChronoField.MONTH_OF_YEAR));
+        assertEquals(10, localDate.get(ChronoField.DAY_OF_MONTH));
+    }
+
+    @Test
+    public void shouldReturn10thNovember2010WhenConvertViaSqlDate() {
+        // given
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2010, 10, 10);
+        Date dateToConvert = calendar.getTime();
+
+        // when
+        LocalDate localDate = DateToLocalDateConverter.convertToLocalDateViaSqlDate(dateToConvert);
+
+        // then
+        assertEquals(2010, localDate.get(ChronoField.YEAR));
+        assertEquals(11, localDate.get(ChronoField.MONTH_OF_YEAR));
+        assertEquals(10, localDate.get(ChronoField.DAY_OF_MONTH));
+    }
+
     @Test
     public void shouldReturn10thNovember2010WhenConvertToLocalDate() {
         // given

core-java-9/src/test/java/com/baeldung/java9/datetime/DateToLocalDateTimeConverterTest.java

@@ -29,6 +29,60 @@ public class DateToLocalDateTimeConverterTest {
         calendar.set(2010, 10, 10, 8, 20);
         Date dateToConvert = calendar.getTime();
 
+        // when
+        LocalDateTime localDateTime = DateToLocalDateTimeConverter.convertToLocalDateTimeViaInstant(dateToConvert);
+
+        // then
+        assertEquals(2010, localDateTime.get(ChronoField.YEAR));
+        assertEquals(11, localDateTime.get(ChronoField.MONTH_OF_YEAR));
+        assertEquals(10, localDateTime.get(ChronoField.DAY_OF_MONTH));
+        assertEquals(8, localDateTime.get(ChronoField.HOUR_OF_DAY));
+        assertEquals(20, localDateTime.get(ChronoField.MINUTE_OF_HOUR));
+    }
+
+    @Test
+    public void shouldReturn10thNovember2010time8hour20minWhenConvertViaMiliseconds() {
+        // given
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2010, 10, 10, 8, 20);
+        Date dateToConvert = calendar.getTime();
+
+        // when
+        LocalDateTime localDateTime = DateToLocalDateTimeConverter.convertToLocalDateTimeViaMilisecond(dateToConvert);
+
+        // then
+        assertEquals(2010, localDateTime.get(ChronoField.YEAR));
+        assertEquals(11, localDateTime.get(ChronoField.MONTH_OF_YEAR));
+        assertEquals(10, localDateTime.get(ChronoField.DAY_OF_MONTH));
+        assertEquals(8, localDateTime.get(ChronoField.HOUR_OF_DAY));
+        assertEquals(20, localDateTime.get(ChronoField.MINUTE_OF_HOUR));
+    }
+
+    @Test
+    public void shouldReturn10thNovember2010time8hour20minWhenConvertViaSqlTimestamp() {
+        // given
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2010, 10, 10, 8, 20);
+        Date dateToConvert = calendar.getTime();
+
+        // when
+        LocalDateTime localDateTime = DateToLocalDateTimeConverter.convertToLocalDateTimeViaSqlTimestamp(dateToConvert);
+
+        // then
+        assertEquals(2010, localDateTime.get(ChronoField.YEAR));
+        assertEquals(11, localDateTime.get(ChronoField.MONTH_OF_YEAR));
+        assertEquals(10, localDateTime.get(ChronoField.DAY_OF_MONTH));
+        assertEquals(8, localDateTime.get(ChronoField.HOUR_OF_DAY));
+        assertEquals(20, localDateTime.get(ChronoField.MINUTE_OF_HOUR));
+    }
+
+    @Test
+    public void shouldReturn10thNovember2010time8hour20minWhenConvertToLocalDateTime() {
+        // given
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(2010, 10, 10, 8, 20);
+        Date dateToConvert = calendar.getTime();
+
         // when
         LocalDateTime localDateTime = DateToLocalDateTimeConverter.convertToLocalDateTime(dateToConvert);
 

core-java-9/src/test/java/com/baeldung/java9/datetime/LocalDateTimeToDateConverterTest.java

@@ -1,7 +1,7 @@
 /**
  * 
  */
-package com.baeldung.datetime;
+package com.baeldung.java9.datetime;
 
 import static org.junit.Assert.assertEquals;
 

core-java-9/src/test/java/com/baeldung/java9/datetime/LocalDateToDateConverterTest.java

@@ -1,7 +1,7 @@
 /**
  * 
  */
-package com.baeldung.datetime;
+package com.baeldung.java9.datetime;
 
 import static org.junit.Assert.assertEquals;
 

core-java-concurrency/README.md

@@ -31,3 +31,5 @@
 - [Overview of the java.util.concurrent](http://www.baeldung.com/java-util-concurrent)
 - [Semaphores in Java](http://www.baeldung.com/java-semaphore)
 - [Daemon Threads in Java](http://www.baeldung.com/java-daemon-thread)
+- [Implementing a Runnable vs Extending a Thread](http://www.baeldung.com/java-runnable-vs-extending-thread)
+- [How to Kill a Java Thread](http://www.baeldung.com/java-thread-stop)

core-java-concurrency/src/main/java/com/baeldung/concurrent/daemon/NewThread.java

@@ -3,7 +3,6 @@ package com.baeldung.concurrent.daemon;
 public class NewThread extends Thread {
 
     public void run() {
-    	
     	long startTime = System.currentTimeMillis();
         while (true) {
             for (int i = 0; i < 10; i++) {

core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Data.java

@@ -0,0 +1,33 @@
+package com.baeldung.concurrent.waitandnotify;
+
+public class Data {
+    private String packet;
+    
+    // True if receiver should wait
+    // False if sender should wait
+    private boolean transfer = true;
+ 
+    public synchronized String receive() {
+        while (transfer) {
+            try {
+                wait();
+            } catch (InterruptedException e) {}
+        }
+        transfer = true;
+
+        notifyAll();
+        return packet;
+    }
+ 
+    public synchronized void send(String packet) {
+        while (!transfer) {
+            try { 
+                wait();
+            } catch (InterruptedException e) {}
+        }
+        transfer = false;
+        
+        this.packet = packet;
+        notifyAll();
+    }
+}

core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/NetworkDriver.java

@@ -0,0 +1,12 @@
+package com.baeldung.concurrent.waitandnotify;
+
+public class NetworkDriver {
+    public static void main(String[] args) {
+        Data data = new Data();
+        Thread sender = new Thread(new Sender(data));
+        Thread receiver = new Thread(new Receiver(data));
+        
+        sender.start();
+        receiver.start();
+    }
+}

core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Receiver.java

@@ -0,0 +1,25 @@
+package com.baeldung.concurrent.waitandnotify;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+public class Receiver implements Runnable {
+    private Data load;
+ 
+    public Receiver(Data load) {
+        this.load = load;
+    }
+ 
+    public void run() {
+        for(String receivedMessage = load.receive();
+          !"End".equals(receivedMessage) ;
+          receivedMessage = load.receive()) {
+            
+            System.out.println(receivedMessage);
+
+            //Thread.sleep() to mimic heavy server-side processing
+            try {
+                Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 5000));
+            } catch (InterruptedException e) {}
+        }
+    }
+}

core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Sender.java

@@ -0,0 +1,30 @@
+package com.baeldung.concurrent.waitandnotify;
+
+import java.util.concurrent.ThreadLocalRandom;
+
+public class Sender implements Runnable {
+    private Data data;
+ 
+    public Sender(Data data) {
+        this.data = data;
+    }
+ 
+    public void run() {
+        String packets[] = {
+            "First packet",
+            "Second packet",
+            "Third packet",
+            "Fourth packet",
+            "End"
+        };
+ 
+        for (String packet : packets) {
+            data.send(packet);
+            
+            //Thread.sleep() to mimic heavy server-side processing
+            try {
+                Thread.sleep(ThreadLocalRandom.current().nextInt(1000, 5000));
+            } catch (InterruptedException e) {}
+        }
+    }
+}

core-java-concurrency/src/test/java/com/baeldung/concurrent/executorservice/WaitingForThreadsToFinishTest.java

@@ -9,7 +9,6 @@ import java.util.List;
 import java.util.concurrent.*;
 
 import static junit.framework.TestCase.assertTrue;
-import static org.junit.Assert.fail;
 
 public class WaitingForThreadsToFinishTest {
 
@@ -40,9 +39,7 @@ public class WaitingForThreadsToFinishTest {
             CountDownLatch latch = new CountDownLatch(2);
             
             for (int i = 0; i < 2; i++) {
-                WORKER_THREAD_POOL.submit(new Runnable() {                
+                WORKER_THREAD_POOL.submit(() -> {
-                    @Override
-                    public void run() {
                     try {
                         Thread.sleep(1000);
                         latch.countDown();
@@ -50,7 +47,6 @@ public class WaitingForThreadsToFinishTest {
                         e.printStackTrace();
                         Thread.currentThread().interrupt();
                     }
-                    }
                 });
             }
 
@@ -83,13 +79,9 @@ public class WaitingForThreadsToFinishTest {
             awaitTerminationAfterShutdown(WORKER_THREAD_POOL);
 
             try {
-                WORKER_THREAD_POOL.submit(new Callable<String>() {
+                WORKER_THREAD_POOL.submit((Callable<String>) () -> {
-                    @Override
-                    public String call() throws Exception {
-                        fail("This thread should have been rejected !");
                     Thread.sleep(1000000);
                     return null;
-                    }
                 });
             } catch (RejectedExecutionException ex) {
                 //

core-java-concurrency/src/test/java/com/baeldung/concurrent/stopping/StopThreadTest.java

@@ -1,7 +1,11 @@
 package com.baeldung.concurrent.stopping;
 
+import com.jayway.awaitility.Awaitility;
 import org.junit.Test;
 
+import java.util.concurrent.TimeUnit;
+
+import static com.jayway.awaitility.Awaitility.await;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
@@ -22,11 +26,10 @@ public class StopThreadTest {
 
         // Stop it and make sure the flags have been reversed
         controlSubThread.stop();
-        Thread.sleep(interval);
+        await()
-        assertTrue(controlSubThread.isStopped());
+          .until(() -> assertTrue(controlSubThread.isStopped()));
     }
 
-
     @Test
     public void whenInterruptedThreadIsStopped() throws InterruptedException {
 
@@ -44,7 +47,8 @@ public class StopThreadTest {
         controlSubThread.interrupt();
 
         // Wait less than the time we would normally sleep, and make sure we exited.
-        Thread.sleep(interval/10);
+        Awaitility.await()
-        assertTrue(controlSubThread.isStopped());
+          .atMost(interval/ 10, TimeUnit.MILLISECONDS)
+          .until(controlSubThread::isStopped);
     }
 }

core-java-concurrency/src/test/java/com/baeldung/concurrent/waitandnotify/NetworkIntegrationTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.concurrent.waitandnotify;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class NetworkIntegrationTest {
+
+	private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+	private final ByteArrayOutputStream errContent = new ByteArrayOutputStream();
+	private String expected;
+	
+	@Before
+	public void setUpStreams() {
+	    System.setOut(new PrintStream(outContent));
+	    System.setErr(new PrintStream(errContent));
+	}
+	
+	@Before
+	public void setUpExpectedOutput() {
+		StringWriter expectedStringWriter = new StringWriter();
+		
+		PrintWriter printWriter = new PrintWriter(expectedStringWriter);
+		printWriter.println("First packet");
+		printWriter.println("Second packet");
+		printWriter.println("Third packet");
+		printWriter.println("Fourth packet");
+		printWriter.close();
+		
+		expected = expectedStringWriter.toString();
+	}
+
+	@After
+	public void cleanUpStreams() {
+	    System.setOut(null);
+	    System.setErr(null);
+	}
+	
+	@Test
+	public void givenSenderAndReceiver_whenSendingPackets_thenNetworkSynchronized() {
+        Data data = new Data();
+        Thread sender = new Thread(new Sender(data));
+        Thread receiver = new Thread(new Receiver(data));
+        
+        sender.start();
+        receiver.start();
+        
+        //wait for sender and receiver to finish before we test against expected
+        try {
+			sender.join();
+			receiver.join();
+		} catch (InterruptedException e) {
+			e.printStackTrace();
+		}
+		
+	    assertEquals(expected, outContent.toString());
+	}
+}

core-java-sun/.gitignore

@@ -0,0 +1,26 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+*.txt
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml

core-java-sun/README.md

@@ -0,0 +1,6 @@
+=========
+
+## Core Java Cookbooks and Examples
+
+### Relevant Articles: 
+- [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)

core-java-sun/pom.xml

@@ -0,0 +1,489 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>core-java-sun</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>core-java-sun</name>
+
+    <dependencies>
+
+        <!-- utils -->
+        <dependency>
+            <groupId>net.sourceforge.collections</groupId>
+            <artifactId>collections-generic</artifactId>
+            <version>${collections-generic.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons-io.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-math3</artifactId>
+            <version>${commons-math3.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.decimal4j</groupId>
+            <artifactId>decimal4j</artifactId>
+            <version>${decimal4j.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.bouncycastle</groupId>
+            <artifactId>bcprov-jdk15on</artifactId>
+            <version>${bouncycastle.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.unix4j</groupId>
+            <artifactId>unix4j-command</artifactId>
+            <version>${unix4j.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.googlecode.grep4j</groupId>
+            <artifactId>grep4j</artifactId>
+            <version>${grep4j.version}</version>
+        </dependency>
+        <!-- web -->
+
+        <!-- marshalling -->
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
+        <!-- logging -->
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>1.2.17</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+            <!-- <scope>runtime</scope> -->
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>jcl-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+            <!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
+        </dependency>
+        <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
+            <groupId>org.slf4j</groupId>
+            <artifactId>log4j-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>${lombok.version}</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <!-- test scoped -->
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-core</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.jayway.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+            <version>${avaitility.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>commons-codec</groupId>
+            <artifactId>commons-codec</artifactId>
+            <version>${commons-codec.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.javamoney</groupId>
+            <artifactId>moneta</artifactId>
+            <version>1.1</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.owasp.esapi</groupId>
+            <artifactId>esapi</artifactId>
+            <version>2.1.0.1</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.sun.messaging.mq</groupId>
+            <artifactId>fscontext</artifactId>
+            <version>${fscontext.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.codepoetics</groupId>
+            <artifactId>protonpack</artifactId>
+            <version>${protonpack.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>one.util</groupId>
+            <artifactId>streamex</artifactId>
+            <version>${streamex.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vavr</groupId>
+            <artifactId>vavr</artifactId>
+            <version>${vavr.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>1.19</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>1.19</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-web</artifactId>
+            <version>4.3.4.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun</groupId>
+            <artifactId>tools</artifactId>
+            <version>1.8.0</version>
+            <scope>system</scope>
+            <systemPath>${java.home}/../lib/tools.jar</systemPath>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>**/*LiveTest.java</exclude>
+                        <exclude>**/*IntegrationTest.java</exclude>
+                        <exclude>**/*LongRunningUnitTest.java</exclude>
+                        <exclude>**/*ManualTest.java</exclude>
+                    </excludes>
+
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>copy-dependencies</id>
+                        <phase>prepare-package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}/libs</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <classpathPrefix>libs/</classpathPrefix>
+                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                        <configuration>
+                            <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
+                            <archive>
+                                <manifest>
+                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                                </manifest>
+                            </archive>
+                            <descriptorRefs>
+                                <descriptorRef>jar-with-dependencies</descriptorRef>
+                            </descriptorRefs>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <shadedArtifactAttached>true</shadedArtifactAttached>
+                            <transformers>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>com.jolira</groupId>
+                <artifactId>onejar-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <configuration>
+                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                            <attachToBuild>true</attachToBuild>
+                            <filename>${project.build.finalName}-onejar.${project.packaging}</filename>
+                        </configuration>
+                        <goals>
+                            <goal>one-jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                        <configuration>
+                            <classifier>spring-boot</classifier>
+                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.6.0</version>
+                <configuration>
+                    <executable>java</executable>
+                    <mainClass>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</mainClass>
+                    <arguments>
+                        <argument>-Xmx300m</argument>
+                        <argument>-XX:+UseParallelGC</argument>
+                        <argument>-classpath</argument>
+                        <classpath />
+                        <argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
+                    </arguments>
+                </configuration>
+            </plugin>
+
+
+        </plugins>
+
+    </build>
+
+    <profiles>
+        <profile>
+            <id>integration</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-surefire-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <phase>integration-test</phase>
+                                <goals>
+                                    <goal>test</goal>
+                                </goals>
+                                <configuration>
+                                    <excludes>
+                                        <exclude>**/*ManualTest.java</exclude>
+                                    </excludes>
+                                    <includes>
+                                        <include>**/*IntegrationTest.java</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                        <configuration>
+                            <systemPropertyVariables>
+                                <test.mime>json</test.mime>
+                            </systemPropertyVariables>
+                        </configuration>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.codehaus.mojo</groupId>
+                        <artifactId>exec-maven-plugin</artifactId>
+
+                        <executions>
+                            <execution>
+                                <id>run-benchmarks</id>
+                                <!-- <phase>integration-test</phase> -->
+                                <phase>none</phase>
+                                <goals>
+                                    <goal>exec</goal>
+                                </goals>
+                                <configuration>
+                                    <classpathScope>test</classpathScope>
+                                    <executable>java</executable>
+                                    <arguments>
+                                        <argument>-classpath</argument>
+                                        <classpath />
+                                        <argument>org.openjdk.jmh.Main</argument>
+                                        <argument>.*</argument>
+                                    </arguments>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+    <properties>
+        <!-- marshalling -->
+        <jackson.version>2.8.5</jackson.version>
+
+        <!-- logging -->
+        <org.slf4j.version>1.7.21</org.slf4j.version>
+        <logback.version>1.1.7</logback.version>
+
+        <!-- util -->
+        <guava.version>23.0</guava.version>
+        <commons-lang3.version>3.5</commons-lang3.version>
+        <bouncycastle.version>1.55</bouncycastle.version>
+        <commons-codec.version>1.10</commons-codec.version>
+        <commons-math3.version>3.6.1</commons-math3.version>
+        <decimal4j.version>1.0.3</decimal4j.version>
+        <commons-io.version>2.5</commons-io.version>
+        <commons-collections4.version>4.1</commons-collections4.version>
+        <collections-generic.version>4.01</collections-generic.version>
+        <unix4j.version>0.4</unix4j.version>
+        <grep4j.version>1.8.7</grep4j.version>
+        <lombok.version>1.16.12</lombok.version>
+        <fscontext.version>4.6-b01</fscontext.version>
+        <protonpack.version>1.13</protonpack.version>
+        <streamex.version>0.6.5</streamex.version>
+        <vavr.version>0.9.0</vavr.version>
+
+        <!-- testing -->
+        <org.hamcrest.version>1.3</org.hamcrest.version>
+        <junit.version>4.12</junit.version>
+        <mockito.version>2.8.9</mockito.version>
+        <assertj.version>3.6.1</assertj.version>
+        <avaitility.version>1.7.0</avaitility.version>
+
+        <!-- maven plugins -->
+        <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
+        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+    </properties>
+</project>

core-java-sun/src/main/java/com/baeldung/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [SHA-256 Hashing in Java](http://www.baeldung.com/sha-256-hashing-java)

core-java-sun/src/main/resources/log4j.properties

@@ -0,0 +1,6 @@
+log4j.rootLogger=DEBUG, A1
+
+log4j.appender.A1=org.apache.log4j.ConsoleAppender
+
+log4j.appender.A1.layout=org.apache.log4j.PatternLayout
+log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

core-java/README.md

@@ -117,3 +117,12 @@
 - [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
 - [A Guide to the Static Keyword in Java](http://www.baeldung.com/java-static)
 - [Initializing Arrays in Java](http://www.baeldung.com/java-initialize-array)
+- [Guide to Java String Pool](http://www.baeldung.com/java-string-pool)
+- [Copy a File with Java](http://www.baeldung.com/java-copy-file)
+- [Introduction to Creational Design Patterns](http://www.baeldung.com/creational-design-patterns)
+- [Quick Example - Comparator vs Comparable in Java](http://www.baeldung.com/java-comparator-comparable)
+- [Quick Guide to Java Stack](http://www.baeldung.com/java-stack)
+- [The Java continue and break Keywords](http://www.baeldung.com/java-continue-and-break)
+- [Java – Append Data to a File](http://www.baeldung.com/java-append-to-file)
+- [Introduction to the Java ArrayDeque](http://www.baeldung.com/java-array-deque)
+- [Guide to java.util.Formatter](http://www.baeldung.com/java-string-formatter)

core-java/customers.xml

@@ -0,0 +1,95 @@
+<?xml version="1.0"?>
+<webRowSet xmlns="http://java.sun.com/xml/ns/jdbc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+xsi:schemaLocation="http://java.sun.com/xml/ns/jdbc http://java.sun.com/xml/ns/jdbc/webrowset.xsd">
+  <properties>
+    <command>SELECT * FROM customers</command>
+    <concurrency>1008</concurrency>
+    <datasource><null/></datasource>
+    <escape-processing>true</escape-processing>
+    <fetch-direction>1000</fetch-direction>
+    <fetch-size>0</fetch-size>
+    <isolation-level>2</isolation-level>
+    <key-columns>
+    </key-columns>
+    <map>
+    </map>
+    <max-field-size>0</max-field-size>
+    <max-rows>0</max-rows>
+    <query-timeout>0</query-timeout>
+    <read-only>true</read-only>
+    <rowset-type>ResultSet.TYPE_SCROLL_INSENSITIVE</rowset-type>
+    <show-deleted>false</show-deleted>
+    <table-name>customers</table-name>
+    <url>jdbc:h2:mem:testdb</url>
+    <sync-provider>
+      <sync-provider-name>com.sun.rowset.providers.RIOptimisticProvider</sync-provider-name>
+      <sync-provider-vendor>Oracle Corporation</sync-provider-vendor>
+      <sync-provider-version>1.0</sync-provider-version>
+      <sync-provider-grade>2</sync-provider-grade>
+      <data-source-lock>1</data-source-lock>
+    </sync-provider>
+  </properties>
+  <metadata>
+    <column-count>2</column-count>
+    <column-definition>
+      <column-index>1</column-index>
+      <auto-increment>false</auto-increment>
+      <case-sensitive>true</case-sensitive>
+      <currency>false</currency>
+      <nullable>0</nullable>
+      <signed>true</signed>
+      <searchable>true</searchable>
+      <column-display-size>11</column-display-size>
+      <column-label>ID</column-label>
+      <column-name>ID</column-name>
+      <schema-name>PUBLIC</schema-name>
+      <column-precision>10</column-precision>
+      <column-scale>0</column-scale>
+      <table-name>CUSTOMERS</table-name>
+      <catalog-name>TESTDB</catalog-name>
+      <column-type>4</column-type>
+      <column-type-name>INTEGER</column-type-name>
+    </column-definition>
+    <column-definition>
+      <column-index>2</column-index>
+      <auto-increment>false</auto-increment>
+      <case-sensitive>true</case-sensitive>
+      <currency>false</currency>
+      <nullable>0</nullable>
+      <signed>true</signed>
+      <searchable>true</searchable>
+      <column-display-size>50</column-display-size>
+      <column-label>NAME</column-label>
+      <column-name>NAME</column-name>
+      <schema-name>PUBLIC</schema-name>
+      <column-precision>50</column-precision>
+      <column-scale>0</column-scale>
+      <table-name>CUSTOMERS</table-name>
+      <catalog-name>TESTDB</catalog-name>
+      <column-type>12</column-type>
+      <column-type-name>VARCHAR</column-type-name>
+    </column-definition>
+  </metadata>
+  <data>
+    <currentRow>
+      <columnValue>1</columnValue>
+      <columnValue>Customer1</columnValue>
+    </currentRow>
+    <currentRow>
+      <columnValue>2</columnValue>
+      <columnValue>Customer2</columnValue>
+    </currentRow>
+    <currentRow>
+      <columnValue>3</columnValue>
+      <columnValue>Customer3</columnValue>
+    </currentRow>
+    <currentRow>
+      <columnValue>4</columnValue>
+      <columnValue>Customer4</columnValue>
+    </currentRow>
+    <currentRow>
+      <columnValue>5</columnValue>
+      <columnValue>Customer5</columnValue>
+    </currentRow>
+  </data>
+</webRowSet>

core-java/pom.xml

@@ -180,7 +180,12 @@
 			<artifactId>esapi</artifactId>
 			<version>2.1.0.1</version>
 		</dependency>
-
+		<dependency>
+			<groupId>com.h2database</groupId>
+			<artifactId>h2</artifactId>
+			<version>1.4.196</version>
+			<scope>runtime</scope>
+		</dependency>		
 		<dependency>
 			<groupId>com.sun.messaging.mq</groupId>
 			<artifactId>fscontext</artifactId>
@@ -216,13 +221,13 @@
 			<artifactId>spring-web</artifactId>
 			<version>4.3.4.RELEASE</version>
 		</dependency>
+
 		<dependency>
-            <groupId>com.sun</groupId>
+			<groupId>org.springframework.boot</groupId>
-            <artifactId>tools</artifactId>
+			<artifactId>spring-boot-starter</artifactId>
-            <version>1.8.0</version>
+			<version>1.5.8.RELEASE</version>
-            <scope>system</scope>
-            <systemPath>${java.home}/../lib/tools.jar</systemPath>
 		</dependency>
+
 	</dependencies>
 
 	<build>

core-java/src/main/java/com/baeldung/array/ArrayBenchmarkRunner.java

@@ -0,0 +1,21 @@
+package com.baeldung.array;
+
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+public class ArrayBenchmarkRunner {
+
+  public static void main(String[] args) throws Exception {
+
+    Options options = new OptionsBuilder()
+        .include(SearchArrayTest.class.getSimpleName()).threads(1)
+        .forks(1).shouldFailOnError(true).shouldDoGC(true)
+        .jvmArgs("-server").build();
+
+    new Runner(options).run();
+
+
+  }
+
+}

core-java/src/main/java/com/baeldung/array/ArrayInverter.java

@@ -0,0 +1,41 @@
+package com.baeldung.array;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.IntStream;
+
+import org.apache.commons.lang3.ArrayUtils;
+
+import com.google.common.collect.Lists;
+
+public class ArrayInverter {
+
+    public void invertUsingFor(Object[] array) {
+        for (int i = 0; i < array.length / 2; i++) {
+            Object temp = array[i];
+            array[i] = array[array.length - 1 - i];
+            array[array.length - 1 - i] = temp;
+        }
+    }
+
+    public void invertUsingCollectionsReverse(Object[] array) {
+        List<Object> list = Arrays.asList(array);
+        Collections.reverse(list);
+    }
+
+    public Object[] invertUsingStreams(final Object[] array) {
+        return IntStream.range(1, array.length + 1).mapToObj(i -> array[array.length - i]).toArray();
+    }
+
+    public void invertUsingCommonsLang(Object[] array) {
+        ArrayUtils.reverse(array);
+    }
+
+    public Object[] invertUsingGuava(Object[] array) {
+        List<Object> list = Arrays.asList(array);
+        List<Object> reverted = Lists.reverse(list);
+        return reverted.toArray();
+    }
+
+}

core-java/src/main/java/com/baeldung/array/SearchArrayTest.java

@@ -0,0 +1,115 @@
+package com.baeldung.array;
+
+import org.openjdk.jmh.annotations.*;
+
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@Warmup(iterations = 5)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+public class SearchArrayTest {
+
+    @Benchmark
+    public void searchArrayLoop() {
+
+        int count = 1000;
+        String[] strings = seedArray(count);
+        for (int i = 0; i < count; i++) {
+            searchLoop(strings, "T");
+        }
+    }
+
+    @Benchmark
+    public void searchArrayAllocNewList() {
+
+        int count = 1000;
+        String[] strings = seedArray(count);
+        for (int i = 0; i < count; i++) {
+            searchList(strings, "W");
+        }
+
+    }
+
+    @Benchmark
+    public void searchArrayAllocNewSet() {
+
+        int count = 1000;
+        String[] strings = seedArray(count);
+        for (int i = 0; i < count; i++) {
+            searchSet(strings, "S");
+        }
+    }
+
+
+    @Benchmark
+    public void searchArrayReuseList() {
+
+        int count = 1000;
+        String[] strings = seedArray(count);
+
+        List<String> asList = Arrays.asList(strings);
+
+        for (int i = 0; i < count; i++) {
+            asList.contains("W");
+        }
+    }
+
+
+    @Benchmark
+    public void searchArrayReuseSet() {
+
+        int count = 1000;
+        String[] strings = seedArray(count);
+        Set<String> asSet = new HashSet<>(Arrays.asList(strings));
+        for (int i = 0; i < count; i++) {
+            asSet.contains("S");
+        }
+    }
+
+
+    @Benchmark
+    public void searchArrayBinarySearch() {
+
+        int count = 1000;
+        String[] strings = seedArray(count);
+        Arrays.sort(strings);
+
+        long startTime = System.nanoTime();
+        for (int i = 0; i < count; i++) {
+            Arrays.binarySearch(strings, "A");
+        }
+        long duration = System.nanoTime() - startTime;
+        //System.out.println("Binary search:  " + duration / 10000);
+
+    }
+
+    private boolean searchList(String[] strings, String searchString) {
+      return Arrays.asList(strings).contains(searchString);
+  }
+
+    private boolean searchSet(String[] strings, String searchString) {
+        Set<String> set = new HashSet<>(Arrays.asList(strings));
+        return set.contains(searchString);
+    }
+
+    private boolean searchLoop(String[] strings, String searchString) {
+        for (String s : strings) {
+            if (s.equals(searchString))
+            return true;
+        }
+        return false;
+    }
+
+    private String[] seedArray(int length) {
+
+        String[] strings = new String[length];
+        Random random = new Random();
+        for (int i = 0; i < length; i++)
+        {
+            strings[i] = String.valueOf(random.nextInt());
+        }
+        return strings;
+    }
+
+}

core-java/src/main/java/com/baeldung/comparable/Player.java

@@ -0,0 +1,51 @@
+package com.baeldung.comparable;
+
+public class Player implements Comparable<Player> {
+
+    private int ranking;
+
+    private String name;
+
+    private int age;
+
+    public Player(int ranking, String name, int age) {
+        this.ranking = ranking;
+        this.name = name;
+        this.age = age;
+    }
+
+    public int getRanking() {
+        return ranking;
+    }
+
+    public void setRanking(int ranking) {
+        this.ranking = ranking;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return this.name;
+    }
+
+    @Override
+    public int compareTo(Player otherPlayer) {
+        return (this.getRanking() - otherPlayer.getRanking());
+    }
+
+}

core-java/src/main/java/com/baeldung/comparable/PlayerSorter.java

@@ -0,0 +1,25 @@
+package com.baeldung.comparable;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class PlayerSorter {
+
+    public static void main(String[] args) {
+
+        List<Player> footballTeam = new ArrayList<Player>();
+        Player player1 = new Player(59, "John", 20);
+        Player player2 = new Player(67, "Roger", 22);
+        Player player3 = new Player(45, "Steven", 24);
+        footballTeam.add(player1);
+        footballTeam.add(player2);
+        footballTeam.add(player3);
+
+        System.out.println("Before Sorting : " + footballTeam);
+        Collections.sort(footballTeam);
+        System.out.println("After Sorting : " + footballTeam);
+
+    }
+
+}

core-java/src/main/java/com/baeldung/comparator/Player.java

@@ -0,0 +1,46 @@
+package com.baeldung.comparator;
+
+public class Player {
+
+    private int ranking;
+
+    private String name;
+
+    private int age;
+
+    public Player(int ranking, String name, int age) {
+        this.ranking = ranking;
+        this.name = name;
+        this.age = age;
+    }
+
+    public int getRanking() {
+        return ranking;
+    }
+
+    public void setRanking(int ranking) {
+        this.ranking = ranking;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return this.name;
+    }
+
+}

core-java/src/main/java/com/baeldung/comparator/PlayerAgeComparator.java

@@ -0,0 +1,12 @@
+package com.baeldung.comparator;
+
+import java.util.Comparator;
+
+public class PlayerAgeComparator implements Comparator<Player> {
+
+    @Override
+    public int compare(Player firstPlayer, Player secondPlayer) {
+       return (firstPlayer.getAge() - secondPlayer.getAge());
+    }
+
+}

core-java/src/main/java/com/baeldung/comparator/PlayerAgeSorter.java

@@ -0,0 +1,27 @@
+package com.baeldung.comparator;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class PlayerAgeSorter {
+
+    public static void main(String[] args) {
+        
+        List<Player> footballTeam = new ArrayList<Player>();
+        Player player1 = new Player(59, "John", 22);
+        Player player2 = new Player(67, "Roger", 20);
+        Player player3 = new Player(45, "Steven", 24);
+        footballTeam.add(player1);
+        footballTeam.add(player2);
+        footballTeam.add(player3);
+        
+        System.out.println("Before Sorting : " + footballTeam);
+        //Instance of PlayerAgeComparator
+        PlayerAgeComparator playerComparator = new PlayerAgeComparator();
+        Collections.sort(footballTeam, playerComparator);
+        System.out.println("After Sorting by age : " + footballTeam);
+        
+    }
+
+}

core-java/src/main/java/com/baeldung/comparator/PlayerRankingComparator.java

@@ -0,0 +1,12 @@
+package com.baeldung.comparator;
+
+import java.util.Comparator;
+
+public class PlayerRankingComparator implements Comparator<Player> {
+
+    @Override
+    public int compare(Player firstPlayer, Player secondPlayer) {
+       return (firstPlayer.getRanking() - secondPlayer.getRanking());
+    }
+
+}

core-java/src/main/java/com/baeldung/comparator/PlayerRankingSorter.java

@@ -0,0 +1,27 @@
+package com.baeldung.comparator;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class PlayerRankingSorter {
+
+    public static void main(String[] args) {
+        
+        List<Player> footballTeam = new ArrayList<Player>();
+        Player player1 = new Player(59, "John", 22);
+        Player player2 = new Player(67, "Roger", 20);
+        Player player3 = new Player(45, "Steven", 40);
+        footballTeam.add(player1);
+        footballTeam.add(player2);
+        footballTeam.add(player3);
+        
+        System.out.println("Before Sorting : " + footballTeam);
+        //Instance of PlayerRankingComparator
+        PlayerRankingComparator playerComparator = new PlayerRankingComparator();
+        Collections.sort(footballTeam, playerComparator);
+        System.out.println("After Sorting by ranking : " + footballTeam);
+        
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/AbstractFactory.java

@@ -0,0 +1,6 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public interface AbstractFactory {
+    Animal getAnimal(String toyType) ;
+    Color getColor(String colorType);
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/AbstractPatternDriver.java

@@ -0,0 +1,18 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class AbstractPatternDriver {
+    public static void main(String[] args) {
+        AbstractFactory abstractFactory;
+        
+        //creating a brown toy dog
+        abstractFactory = FactoryProvider.getFactory("Toy");
+        Animal toy = abstractFactory.getAnimal("Dog");
+        
+        abstractFactory = FactoryProvider.getFactory("Color");
+        Color color = abstractFactory.getColor("Brown");
+        
+        String result = "A " + toy.getType() + " with " + color.getColor() + " color " + toy.makeSound();
+        
+        System.out.println(result);
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Animal.java

@@ -0,0 +1,6 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public interface Animal {
+    String getType();
+    String makeSound();
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/AnimalFactory.java

@@ -0,0 +1,21 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class AnimalFactory implements AbstractFactory {
+
+    @Override
+    public Animal getAnimal(String animalType) {
+        if ("Dog".equalsIgnoreCase(animalType)) {
+            return new Dog();
+        } else if ("Duck".equalsIgnoreCase(animalType)) {
+            return new Duck();
+        }
+
+        return null;
+    }
+
+    @Override
+    public Color getColor(String color) {
+        throw new UnsupportedOperationException();
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Brown.java

@@ -0,0 +1,10 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class Brown implements Color {
+
+    @Override
+    public String getColor() {
+        return "brown";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Color.java

@@ -0,0 +1,5 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public interface Color {
+    String getColor();
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/ColorFactory.java

@@ -0,0 +1,21 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class ColorFactory implements AbstractFactory {
+
+    @Override
+    public Color getColor(String colorType) {
+        if ("Brown".equalsIgnoreCase(colorType)) {
+            return new Brown();
+        } else if ("White".equalsIgnoreCase(colorType)) {
+            return new White();
+        }
+
+        return null;
+    }
+
+    @Override
+    public Animal getAnimal(String toyType) {
+        throw new UnsupportedOperationException();
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Dog.java

@@ -0,0 +1,15 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class Dog implements Animal {
+
+    @Override
+    public String getType() {
+        return "Dog";
+    }
+
+    @Override
+    public String makeSound() {
+        return "Barks";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Duck.java

@@ -0,0 +1,15 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class Duck implements Animal {
+
+    @Override
+    public String getType() {
+        return "Duck";
+    }
+
+    @Override
+    public String makeSound() {
+        return "Squeks";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/FactoryProvider.java

@@ -0,0 +1,15 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class FactoryProvider {
+    public static AbstractFactory getFactory(String choice){
+        
+        if("Toy".equalsIgnoreCase(choice)){
+            return new AnimalFactory();
+        }
+        else if("Color".equalsIgnoreCase(choice)){
+            return new ColorFactory();
+        }
+        
+        return null;
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/White.java

@@ -0,0 +1,10 @@
+package com.baeldung.designpatterns.creational.abstractfactory;
+
+public class White implements Color {
+
+    @Override
+    public String getColor() {
+        return "White";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/builder/BankAccount.java

@@ -0,0 +1,64 @@
+package com.baeldung.designpatterns.creational.builder;
+
+public class BankAccount {
+    private String name;
+    private String accountNumber;
+    private String email;
+    private boolean newsletter;
+
+    //The constructor that takes a builder from which it will create object
+    //the access to this is only provided to builder
+    private BankAccount(BankAccountBuilder builder) {
+        this.name = builder.name;
+        this.accountNumber = builder.accountNumber;
+        this.email = builder.email;
+        this.newsletter = builder.newsletter;
+    }
+    
+    public static class BankAccountBuilder {
+        private String name;
+        private String accountNumber;
+        private String email;
+        private boolean newsletter;
+        
+        //All Mandatory parameters goes with this constructor
+        public BankAccountBuilder(String name, String accountNumber) {
+            this.name = name;
+            this.accountNumber = accountNumber;
+        }
+
+        //setters for optional parameters which returns this same builder
+        //to support fluent design
+        public BankAccountBuilder withEmail(String email) {
+            this.email = email;
+            return this;
+        }
+
+        public BankAccountBuilder wantNewsletter(boolean newsletter) {
+            this.newsletter = newsletter;
+            return this;
+        }
+        
+        //the actual build method that prepares and returns a BankAccount object
+        public BankAccount build() {
+            return new BankAccount(this);
+        }
+    }
+
+    //getters
+    public String getName() {
+        return name;
+    }
+
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public boolean isNewsletter() {
+        return newsletter;
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/builder/BuilderPatternDriver.java

@@ -0,0 +1,16 @@
+package com.baeldung.designpatterns.creational.builder;
+
+public class BuilderPatternDriver {
+    public static void main(String[] args) {
+        BankAccount newAccount = new BankAccount
+          .BankAccountBuilder("Jon", "22738022275")
+          .withEmail("jon@example.com")
+          .wantNewsletter(true)
+          .build();
+
+        System.out.println("Name: " + newAccount.getName());
+        System.out.println("AccountNumber:" + newAccount.getAccountNumber());
+        System.out.println("Email: " + newAccount.getEmail());
+        System.out.println("Want News letter?: " + newAccount.isNewsletter());
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/factory/FactoryDriver.java

@@ -0,0 +1,16 @@
+package com.baeldung.designpatterns.creational.factory;
+
+public class FactoryDriver {
+    public static void main(String[] args) {
+        Polygon p;
+        PolygonFactory factory = new PolygonFactory();
+        
+        //get the shape which has 4 sides
+        p = factory.getPolygon(4);
+        System.out.println("The shape with 4 sides is a " + p.getType());
+        
+        //get the shape which has 4 sides
+        p = factory.getPolygon(8);
+        System.out.println("The shape with 8 sides is a " + p.getType());
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Heptagon.java

@@ -0,0 +1,10 @@
+package com.baeldung.designpatterns.creational.factory;
+
+public class Heptagon implements Polygon {
+
+    @Override
+    public String getType() {
+        return "Heptagon";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Octagon.java

@@ -0,0 +1,10 @@
+package com.baeldung.designpatterns.creational.factory;
+
+public class Octagon implements Polygon {
+
+    @Override
+    public String getType() {
+        return "Octagon";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Pentagon.java

@@ -0,0 +1,10 @@
+package com.baeldung.designpatterns.creational.factory;
+
+public class Pentagon implements Polygon {
+
+    @Override
+    public String getType() {
+        return "Pentagon";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Polygon.java

@@ -0,0 +1,5 @@
+package com.baeldung.designpatterns.creational.factory;
+
+public interface Polygon {
+    String getType();
+}