Question

How to convert a matrix of numbers to a string in Java

Answer 1

import java.util.Arrays;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        int[][] matrix = {
            {4, 7, 9, 18, 29, 0},
            {1, 9, 18, 99, 4, 3},
            {9, 17, 89, 2, 7, 5},
            {19, 49, 6, 1, 9, 8},
            {29, 4, 7, 9, 18, 6}
        };

        String matrixString = Arrays.stream(matrix)
            .map(row -> Arrays.stream(row)
                .mapToObj(Integer::toString)
                .collect(Collectors.joining(" ")))
            .collect(Collectors.joining(" "));

        System.out.println(matrixString);
    }
}



/*
run:

4 7 9 18 29 0 1 9 18 99 4 3 9 17 89 2 7 5 19 49 6 1 9 8 29 4 7 9 18 6

*/

 

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