iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[unique-elements-list] Get Unique Values From an ArrayList In Java (#14152)

This commit is contained in:
Kai Yuan 2023-06-06 04:02:36 +02:00 committed by GitHub
parent f265b51841
commit f0124dcca0
1 changed files with 41 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
core-java-modules/core-java-collections-list-5/src/test/java/com/baeldung/java/uniqueelements/UniqueElementsInListUnitTest.java Normal file
View File

@ -0,0 +1,41 @@
package com.baeldung.java.uniqueelements;
import static java.util.stream.Collectors.toList;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import org.junit.jupiter.api.Test;
public class UniqueElementsInListUnitTest {
// @formatter:off
private static final List<String> MY_LIST = Arrays.asList(new String[]{
"Microsoft Windows",
"Mac OS",
"GNU Linux",
"Free BSD",
"GNU Linux",
"Mac OS"});
// @formatter:on
@Test
void whenConvertToSet_thenGetExpectedResult() {
List<String> result = new ArrayList<>(new HashSet<>(MY_LIST));
assertThat(result).containsExactlyInAnyOrder("Free BSD", "Microsoft Windows", "Mac OS", "GNU Linux");
result = new ArrayList<>(new LinkedHashSet<>(MY_LIST));
assertThat(result).containsExactly("Microsoft Windows", "Mac OS", "GNU Linux", "Free BSD");
}
@Test
void whenUsingStream_thenGetExpectedResult() {
List<String> result = MY_LIST.stream()
.distinct()
.collect(toList());
assertThat(result).containsExactly("Microsoft Windows", "Mac OS", "GNU Linux", "Free BSD");
}
}