Delete core-java-modules/core-java-arrays-guides/src/test/java/com/baeldung/print2DArrays directory
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package com.baeldung.print2DArrays;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import java.util.Arrays;
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import uk.org.webcompere.systemstubs.jupiter.SystemStub;
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import uk.org.webcompere.systemstubs.stream.SystemOut;
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import uk.org.webcompere.systemstubs.jupiter.SystemStubsExtension;
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@ExtendWith(SystemStubsExtension.class)
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public class Print2DArraysUnitTest {
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@SystemStub
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private SystemOut systemOut;
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@Test
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void whenPrint2D_thenUseNested() {
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int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
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for (int i = 0; i < myArray.length; i++) {
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for (int j = 0; j < myArray[i].length; j++) {
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System.out.print(myArray[i][j] + " ");
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}
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System.out.println();
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}
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String expectedOutput = "1 2 3 \n4 5 6 \n7 8 9 \n";
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assertThat(systemOut.getLines()).containsExactly(expectedOutput);
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}
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@Test
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public void whenPrint2D_thenUseStream() {
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int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
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Arrays.stream(myArray) .flatMapToInt(Arrays::stream) .forEach(num -> System.out.print(num + " "));
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String expectedOutput = "1 2 3 4 5 6 7 8 9";
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assertThat(systemOut.getLines()).containsExactly(expectedOutput);
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}
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@Test
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public void whenPrint2D_thenUseDeepToString() {
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int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
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System.out.println(Arrays.deepToString(myArray));
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String expectedOutput = "[[1, 2, 3], [4, 5, 6], [7, 8, 9]]";
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assertThat(systemOut.getLines()).containsExactly(expectedOutput);
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}
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@Test
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public void whenPrint2D_thenUseArrayToString() {
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int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
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for (int[] row : myArray) {
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System.out.println(Arrays.toString(row));
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}
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String expectedOutput = "[1, 2, 3]\n[4, 5, 6]\n[7, 8, 9]\n";
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assertThat(systemOut.getLines()).containsExactly(expectedOutput);
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}
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}
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