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BAEL-8298 Java 8 Stream anyMatch() vs. findAny() #17608

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merged 2 commits into from
Sep 16, 2024
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BAEL-8298 Java 8 Stream anyMatch() vs. findAny() #17608

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BAEL-8298 Java 8 Stream anyMatch() vs. findAny()
yabetancourt Sep 15, 2024
a2108db
BAEL-8298 renamed test names
yabetancourt Sep 16, 2024
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83 changes: 83 additions & 0 deletions ...reams-6/src/test/java/com/baeldung/streams/findanyvsanymatch/FindAnyAnyMatchUnitTest.java
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package com.baeldung.streams.findanyvsanymatch;

import org.junit.jupiter.api.Test;

import java.util.Arrays;
import java.util.List;

import static org.junit.jupiter.api.Assertions.*;

public class FindAnyAnyMatchUnitTest {

@Test
public void whenFilterStreamUsingFindAny_thenOK() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

Integer result = numbers.stream()
.filter(n -> n % 2 == 0)
.findAny()
.orElse(null);

assertNotNull(result);
assertTrue(Arrays.asList(2, 4, 6, 8, 10).contains(result));
}

@Test
public void whenParallelStreamUsingFindAny_thenOK() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

Integer result = numbers.parallelStream()
.filter(n -> n % 2 == 0)
.findAny()
.orElse(null);

assertNotNull(result);
assertTrue(Arrays.asList(2, 4, 6, 8, 10).contains(result));
}


@Test
public void whenFilterStreamUsingAnyMatch_thenOK() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

boolean result = numbers.parallelStream()
.anyMatch(n -> n % 2 == 0);

assertTrue(result);
}

@Test
public void whenFilterStreamUsingFindFirst_thenOK() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

Integer result = numbers.stream()
.filter(n -> n % 2 == 0)
.findFirst()
.orElse(null);

assertNotNull(result);
assertEquals(2, result);
}

@Test
public void whenCountingElementsInStream_thenOK() {
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

long count = numbers.stream()
.filter(n -> n % 2 == 0)
.count();

assertEquals(5, count);
}

@Test
public void whenCheckingAllMatch_thenOK() {
List<Integer> numbers = Arrays.asList(2, 4, 6, 8, 10);

boolean allEven = numbers.stream()
.allMatch(n -> n % 2 == 0);

assertTrue(allEven);
}

}