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[slicingArrays] Slicing Arrays in Java (#12957)

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Kai Yuan 2022-11-04 02:59:33 +01:00 committed by GitHub
parent 90812f01ee
commit 0e244ce133
1 changed files with 43 additions and 0 deletions
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core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arrayslicing/SlicingArrayUnitTest.java Normal file
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package com.baeldung.arrayslicing;
import org.apache.commons.lang3.ArrayUtils;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
public class SlicingArrayUnitTest {
private static final String[] LANGUAGES = new String[] { "Python", "Java", "Kotlin", "Scala", "Ruby", "Go", "Rust" };
private static final String[] JVM_LANGUAGES = new String[] { "Java", "Kotlin", "Scala" };
@Test
void givenAnArray_whenSlicingUsingStream_shouldGetExpectedResult() {
String[] result = Arrays.stream(LANGUAGES, 1, 4).toArray(String[]::new);
assertArrayEquals(JVM_LANGUAGES, result);
}
@Test
void givenAnArray_whenSlicingUsingArraysCopyOfRange_shouldGetExpectedResult() {
String[] result = Arrays.copyOfRange(LANGUAGES, 1, 4);
assertArrayEquals(JVM_LANGUAGES, result);
}
@Test
void givenAnArray_whenSlicingUsingSystemArraycopy_shouldGetExpectedResult() {
String[] result = new String[3];
System.arraycopy(LANGUAGES, 1, result, 0, 3);
assertArrayEquals(JVM_LANGUAGES, result);
String[] result2 = new String[] { "value one", "value two", "value three", "value four", "value five", "value six", "value seven" };
System.arraycopy(LANGUAGES, 1, result2, 2, 3);
assertArrayEquals(new String[] { "value one", "value two", "Java", "Kotlin", "Scala", "value six", "value seven" }, result2);
}
@Test
void givenAnArray_whenSlicingUsingArrayUtils_shouldGetExpectedResult() {
String[] result = ArrayUtils.subarray(LANGUAGES, 1, 4);
assertArrayEquals(JVM_LANGUAGES, result);
}
}