Here you can find the source of matrix_toString(int[][] matrix)
public static String matrix_toString(int[][] matrix)
//package com.java2s; //<div>Icons made by <a href="http://www.flaticon.com/authors/freepik" title="Freepik">Freepik</a> from <a href="http://www.flaticon.com" title="Flaticon">www.flaticon.com</a> is licensed by <a href="http://creativecommons.org/licenses/by/3.0/" title="Creative Commons BY 3.0" target="_blank">CC 3.0 BY</a></div> public class Main { public static String matrix_toString(int[][] matrix) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < matrix.length; i++) { sb.append("[ "); for (int j = 0; j < matrix[0].length; j++) { sb.append(matrix[i][j] + " "); }/*from w w w. ja v a 2s.co m*/ sb.append("]\n"); } return sb.toString(); } }