diff --git a/core-java-9/src/main/java/com/baeldung/java9/rangedates/DatesCollectionIteration.java b/core-java-9/src/main/java/com/baeldung/java9/rangedates/DatesCollectionIteration.java new file mode 100644 index 0000000000..f5ec5d29dc --- /dev/null +++ b/core-java-9/src/main/java/com/baeldung/java9/rangedates/DatesCollectionIteration.java @@ -0,0 +1,24 @@ +package com.baeldung.java9.rangedates; + +import java.util.Collection; +import java.util.Date; + +public class DatesCollectionIteration { + + public void iteratingRangeOfDatesJava7(Collection dates) { + + for (Date date : dates) { + processDate(date); + } + } + + public void iteratingRangeOfDatesJava8(Collection dates) { + dates.stream() + .forEach(this::processDate); + } + + private void processDate(Date date) { + System.out.println(date); + } + +} diff --git a/core-java-9/src/main/java/com/baeldung/java9/rangedates/RangeDatesIteration.java b/core-java-9/src/main/java/com/baeldung/java9/rangedates/RangeDatesIteration.java new file mode 100644 index 0000000000..4972036c91 --- /dev/null +++ b/core-java-9/src/main/java/com/baeldung/java9/rangedates/RangeDatesIteration.java @@ -0,0 +1,43 @@ +package com.baeldung.java9.rangedates; + +import java.time.LocalDate; +import java.util.Calendar; +import java.util.Date; + +public class RangeDatesIteration { + + public void iterateBetweenDatesJava9(LocalDate startDate, LocalDate endDate) { + + startDate.datesUntil(endDate) + .forEach(this::processDate); + } + + public void iterateBetweenDatesJava8(LocalDate start, LocalDate end) { + for (LocalDate date = start; date.isBefore(end); date = date.plusDays(1)) { + processDate(date); + } + } + + public void iterateBetweenDatesJava7(Date start, Date end) { + Date current = start; + + while (current.before(end)) { + processDate(current); + + Calendar calendar = Calendar.getInstance(); + calendar.setTime(current); + + calendar.add(Calendar.DATE, 1); + + current = calendar.getTime(); + } + } + + private void processDate(LocalDate date) { + System.out.println(date); + } + + private void processDate(Date date) { + System.out.println(date); + } +} diff --git a/core-java-9/src/test/java/com/baeldung/java9/rangedates/DatesCollectionIterationUnitTest.java b/core-java-9/src/test/java/com/baeldung/java9/rangedates/DatesCollectionIterationUnitTest.java new file mode 100644 index 0000000000..522b00065e --- /dev/null +++ b/core-java-9/src/test/java/com/baeldung/java9/rangedates/DatesCollectionIterationUnitTest.java @@ -0,0 +1,61 @@ +package com.baeldung.java9.rangedates; + +import java.time.LocalDate; +import java.time.ZoneId; +import java.time.temporal.ChronoUnit; +import java.util.ArrayList; +import java.util.Calendar; +import java.util.Collection; +import java.util.Date; +import java.util.List; +import java.util.stream.Collectors; + +import org.junit.Test; + +public class DatesCollectionIterationUnitTest { + + private Collection localDates = LocalDate.now() + .datesUntil(LocalDate.now() + .plus(10L, ChronoUnit.DAYS)) + .collect(Collectors.toList()); + + private Collection dates = localDates.stream() + .map(localDate -> Date.from(localDate.atStartOfDay(ZoneId.systemDefault()) + .toInstant())) + .collect(Collectors.toList()); + + @Test + public void givenIteratingListOfDatesJava7_WhenStartTodayAndEnding10DaysAhead() { + DatesCollectionIteration iterateInColleciton = new DatesCollectionIteration(); + Calendar today = Calendar.getInstance(); + Calendar next10Ahead = (Calendar) today.clone(); + next10Ahead.add(Calendar.DATE, 10); + + iterateInColleciton.iteratingRangeOfDatesJava7(createRangeDates(today.getTime(), next10Ahead.getTime())); + } + + @Test + public void givenIteratingListOfDatesJava8_WhenStartTodayAndEnd10DaysAhead() { + DatesCollectionIteration iterateInColleciton = new DatesCollectionIteration(); + + iterateInColleciton.iteratingRangeOfDatesJava8(dates); + } + + private List createRangeDates(Date start, Date end) { + + List dates = new ArrayList<>(); + Date current = start; + + while (current.before(end)) { + dates.add(current); + + Calendar calendar = Calendar.getInstance(); + calendar.setTime(current); + calendar.add(Calendar.DATE, 1); + + current = calendar.getTime(); + } + + return dates; + } +} diff --git a/core-java-9/src/test/java/com/baeldung/java9/rangedates/RangeDatesIterationUnitTest.java b/core-java-9/src/test/java/com/baeldung/java9/rangedates/RangeDatesIterationUnitTest.java new file mode 100644 index 0000000000..4f5cd17d98 --- /dev/null +++ b/core-java-9/src/test/java/com/baeldung/java9/rangedates/RangeDatesIterationUnitTest.java @@ -0,0 +1,48 @@ +package com.baeldung.java9.rangedates; + +import java.time.LocalDate; +import java.time.temporal.ChronoUnit; +import java.util.Calendar; +import java.util.Date; + +import org.junit.Test; + +public class RangeDatesIterationUnitTest { + + @Test + public void givenIterateBetweenDatesJava9_WhenStartDateAsTodayAndEndDateAs10DaysAhead() { + LocalDate start = LocalDate.now(); + LocalDate end = start.plus(10L, ChronoUnit.DAYS); + + RangeDatesIteration iteration = new RangeDatesIteration(); + + iteration.iterateBetweenDatesJava9(start, end); + } + + @Test + public void givenIterateBetweenDatesJava8_WhenStartDateAsTodayAndEndDateAs10DaysAhead() { + LocalDate start = LocalDate.now(); + LocalDate end = start.plus(10L, ChronoUnit.DAYS); + + RangeDatesIteration iteration = new RangeDatesIteration(); + + iteration.iterateBetweenDatesJava8(start, end); + } + + @Test + public void givenIterateBetweenDatesJava7_WhenStartDateAsTodayAndEndDateAs10DaysAhead() { + Calendar today = Calendar.getInstance(); + Calendar calendar = Calendar.getInstance(); + calendar.clear(); + calendar.set(today.get(Calendar.YEAR), today.get(Calendar.MONTH), today.get(Calendar.DATE)); + Date start = calendar.getTime(); + + calendar.add(Calendar.DATE, 10); + Date end = calendar.getTime(); + + RangeDatesIteration iteration = new RangeDatesIteration(); + + iteration.iterateBetweenDatesJava7(start, end); + } + +}