BAEL-1344 (#3081)

* BAEL-1344 add java8 convert methods date, localdate, localdatetime

* BAEL-1344 add java9 example

* Move Date to LocalDate and LocalDateTime converters from core-java-8 to core-java-9

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/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/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/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;