diff --git a/core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java b/core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java index 71ec5b147f..57d9d8347b 100644 --- a/core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java +++ b/core-java-8/src/test/java/com/baeldung/java8/Java8SortUnitTest.java @@ -124,11 +124,44 @@ public class Java8SortUnitTest { @Test public final void givenStreamCustomOrdering_whenSortingEntitiesByName_thenCorrectlySorted() { - final List humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12)); final Comparator nameComparator = (h1, h2) -> h1.getName().compareTo(h2.getName()); final List sortedHumans = humans.stream().sorted(nameComparator).collect(Collectors.toList()); Assert.assertThat(sortedHumans.get(0), equalTo(new Human("Jack", 12))); } + + @Test + public final void givenStreamComparatorOrdering_whenSortingEntitiesByName_thenCorrectlySorted() { + final List humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12)); + + final List sortedHumans = humans.stream().sorted(Comparator.comparing(Human::getName)).collect(Collectors.toList()); + Assert.assertThat(sortedHumans.get(0), equalTo(new Human("Jack", 12))); + } + + @Test + public final void givenStreamNaturalOrdering_whenSortingEntitiesByNameReversed_thenCorrectlySorted() { + final List letters = Lists.newArrayList("B", "A", "C"); + + final List reverseSortedLetters = letters.stream().sorted(Comparator.reverseOrder()).collect(Collectors.toList()); + Assert.assertThat(reverseSortedLetters.get(0), equalTo("C")); + } + + @Test + public final void givenStreamCustomOrdering_whenSortingEntitiesByNameReversed_thenCorrectlySorted() { + final List humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12)); + final Comparator reverseNameComparator = (h1, h2) -> h2.getName().compareTo(h1.getName()); + + final List reverseSortedHumans = humans.stream().sorted(reverseNameComparator).collect(Collectors.toList()); + Assert.assertThat(reverseSortedHumans.get(0), equalTo(new Human("Sarah", 10))); + } + + @Test + public final void givenStreamComparatorOrdering_whenSortingEntitiesByNameReversed_thenCorrectlySorted() { + final List humans = Lists.newArrayList(new Human("Sarah", 10), new Human("Jack", 12)); + + final List reverseSortedHumans = humans.stream().sorted(Comparator.comparing(Human::getName, Comparator.reverseOrder())).collect(Collectors.toList()); + Assert.assertThat(reverseSortedHumans.get(0), equalTo(new Human("Sarah", 10))); + } + }