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BAEL-7960: Finding minimum and maximum in a 2D array in Java #16640

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May 18, 2024
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BAEL-7960: Finding minimum and maximum in a 2D array in Java #16640

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BAEL-7960: Finding minimum and maximum in a 2D array in Java
yabetancourt May 12, 2024
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59 changes: 59 additions & 0 deletions ...rrays-multidimensional/src/test/java/com/baeldung/array/minmax/MinMax2DArrayUnitTest.java
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package com.baeldung.array.minmax;

import org.junit.Test;

import java.util.Arrays;
import java.util.IntSummaryStatistics;

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

public class MinMax2DArrayUnitTest {

@Test
public void givenArray2DWhenFindMinAndMaxUsingForLoopsThenCorrect() {
int[][] array = {{8, 4, 1}, {2, 5, 7}, {3, 6, 9}};

int min = array[0][0];
int max = array[0][0];
for (int[] row : array) {
for (int currentValue : row) {
if (currentValue < min) {
min = currentValue;
} else if (currentValue > max) {
max = currentValue;
}
}
}

assertEquals(1, min);
assertEquals(9, max);
}

@Test
public void givenArray2DWhenFindMinAndMaxUsingStreamThenCorrect() {
int[][] array = {{8, 4, 1}, {2, 5, 7}, {3, 6, 9}};

IntSummaryStatistics stats = Arrays
.stream(array)
.flatMapToInt(Arrays::stream)
.summaryStatistics();

assertEquals(1, stats.getMin());
assertEquals(9, stats.getMax());
}

@Test
public void givenArray2DWhenFindMinAndMaxUsingParallelStreamThenCorrect() {
int[][] array = {{8, 4, 1}, {2, 5, 7}, {3, 6, 9}};

IntSummaryStatistics stats = Arrays
.stream(array)
.parallel()
.flatMapToInt(Arrays::stream)
.summaryStatistics();

assertEquals(1, stats.getMin());
assertEquals(9, stats.getMax());
}

}