java - 如何将二维数组打印为矩阵格式

Question

到目前为止我的代码如下......

int [][] out = readGrayscaleImage("robbie_robot.jpg");
    for (int x = 0; x < out.length; x++) {
            System.out.println();
            for (int y = 0; y < out[0].length; y++) {
                System.out.print(out[x][y]);
                System.out.print(", ");
            }
    }

输出为:

255, 255, 255, 255, 255, 254, 255, 255, 255, 255, 
255, 255, 255, 255, 156, 156, 255, 255, 255, 255, 
255, 254, 244, 0, 88, 88, 0, 244, 255, 255, 
255, 255, 255, 208, 39, 39, 184, 255, 255, 255, 
254, 255, 254, 197, 40, 36, 197, 255, 255, 255,

但我需要它看起来像这样......

{255, 255, 255, 255, 255, 254, 255, 255, 255, 255}, 
{255, 255, 255, 255, 156, 156, 255, 255, 255, 255}, 
{255, 254, 244, 0, 88, 88, 0, 244, 255, 255}.
{255, 255, 255, 208, 39, 39, 184, 255, 255, 255}, 
{254, 255, 254, 197, 40, 36, 197, 255, 255, 255}

我该如何解决这个问题？

Answer 1

您可以尝试添加一些打印语句:

int[][] out = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };

for (int x = 0; x < out.length; x++) {
    System.out.print("{");
    for (int y = 0; y < out[0].length; y++) {
        System.out.print(out[x][y] + ",");
    }
    if (x != out.length - 1) {
        System.out.println("},");
    } else {
        System.out.println("}");
    }
}

演示:

{1,2,3,},
{4,5,6,},
{7,8,9,}

注意:您还可以使用StringBuilder:

int[][] out = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
StringBuilder sb = new StringBuilder();

for (int x = 0; x < out.length; x++) {
    sb.append("{");
    for (int y = 0; y < out[0].length; y++) {
        sb.append(out[x][y]).append(",");
    }
    sb.append("},\n");
}
sb.deleteCharAt(sb.length() - 1).deleteCharAt(sb.length() - 1);

System.out.println(sb.toString());