lambda example

core-java-8/.settings/org.eclipse.jdt.ui.prefs

@@ -1,4 +1,3 @@
-#Sat Jan 21 23:04:06 EET 2012
 eclipse.preferences.version=1
 editor_save_participant_org.eclipse.jdt.ui.postsavelistener.cleanup=true
 sp_cleanup.add_default_serial_version_id=true
@@ -14,6 +13,7 @@ sp_cleanup.always_use_blocks=true
 sp_cleanup.always_use_parentheses_in_expressions=true
 sp_cleanup.always_use_this_for_non_static_field_access=false
 sp_cleanup.always_use_this_for_non_static_method_access=false
+sp_cleanup.convert_functional_interfaces=false
 sp_cleanup.convert_to_enhanced_for_loop=true
 sp_cleanup.correct_indentation=true
 sp_cleanup.format_source_code=true
@@ -46,8 +46,10 @@ sp_cleanup.remove_unused_private_methods=true
 sp_cleanup.remove_unused_private_types=true
 sp_cleanup.sort_members=false
 sp_cleanup.sort_members_all=false
-sp_cleanup.use_blocks=false
+sp_cleanup.use_anonymous_class_creation=false
+sp_cleanup.use_blocks=true
 sp_cleanup.use_blocks_only_for_return_and_throw=false
+sp_cleanup.use_lambda=false
 sp_cleanup.use_parentheses_in_expressions=false
 sp_cleanup.use_this_for_non_static_field_access=true
 sp_cleanup.use_this_for_non_static_field_access_only_if_necessary=true

core-java-8/pom.xml

@@ -1,4 +1,5 @@
-<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">
+<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>org.baeldung</groupId>
 	<artifactId>spring-rest</artifactId>
@@ -13,7 +14,7 @@
 		<dependency>
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
-            <version>15.0</version>
+			<version>16.0-rc1</version>
 		</dependency>
 
 		<dependency>
@@ -22,6 +23,12 @@
 			<version>4.0</version>
 		</dependency>
 
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-lang3</artifactId>
+			<version>3.1</version>
+		</dependency>
+
 		<!-- web -->
 
 		<!-- marshalling -->

core-java-8/src/test/java/org/baeldung/java/CoreJava8UnitTest.java

@@ -1,15 +0,0 @@
-package org.baeldung.java;
-
-import org.junit.Test;
-
-public class CoreJava8UnitTest {
-
-	// tests -
-
-	@Test
-	public final void when_thenCorrect() {
-		final Runnable r2 = () -> System.out.println("Hello world two!");
-		r2.run();
-	}
-
-}

core-java-8/src/test/java/org/baeldung/java/CoreJavaUnitTest.java

@@ -1,52 +0,0 @@
-package org.baeldung.java;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-
-import org.apache.commons.collections4.ListUtils;
-import org.junit.Test;
-
-import com.google.common.collect.ImmutableList;
-
-public class CoreJavaUnitTest {
-
-    // tests -
-
-    @Test
-    public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final List<String> synchronizedList = Collections.synchronizedList(list);
-        System.out.println("Synchronized List is: " + synchronizedList);
-    }
-
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingTheJdk_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final List<String> unmodifiableList = Collections.unmodifiableList(list);
-        unmodifiableList.add("four");
-    }
-
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingGuava_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final List<String> unmodifiableList = ImmutableList.copyOf(list);
-        unmodifiableList.add("four");
-    }
-
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final ImmutableList<Object> unmodifiableList = ImmutableList.builder().addAll(list).build();
-        unmodifiableList.add("four");
-    }
-
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
-        unmodifiableList.add("four");
-    }
-
-}

core-java-8/src/test/java/org/baeldung/java8/Java8ComparatorUnitTest.java

@@ -0,0 +1,24 @@
+package org.baeldung.java8;
+
+import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.baeldung.java8.entity.Human;
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+
+public class Java8ComparatorUnitTest {
+
+    // tests -
+
+    @Test
+    public final void when_thenCorrect() {
+        final List<Human> humans = Lists.newArrayList(new Human(randomAlphabetic(5)), new Human(randomAlphabetic(5)));
+        Collections.sort(humans, (final Human h1, final Human h2) -> h1.getName().compareTo(h2.getName()));
+        System.out.println(humans);
+    }
+
+}

core-java-8/src/test/java/org/baeldung/java8/entity/Human.java

@@ -0,0 +1,64 @@
+package org.baeldung.java8.entity;
+
+public class Human {
+    private String name;
+
+    public Human() {
+        super();
+    }
+
+    public Human(final String name) {
+        super();
+
+        this.name = name;
+    }
+
+    // API
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    //
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final Human other = (Human) obj;
+        if (name == null) {
+            if (other.name != null) {
+                return false;
+            }
+        } else if (!name.equals(other.name)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Human [name=").append(name).append("]");
+        return builder.toString();
+    }
+
+}