记录java从左上到右下打印二维数组，从左下到右上打印二维数组

记录java从左上到右下打印二维数组，从左下到右上打印二维数组

左上到右下

   public static void main(String[] args) {
        int[][] matrix = new int[][]{
                new int[]{2, 3, 5,10},
                new int[]{5, 2, 4, 1},
                new int[]{3, 3, 1, 1}
        };

        process(matrix);

    }

    private static void process(int[][] A) {
        int row = A.length;
        int col = A[0].length;
       
//         首先以第0行，列递增为起点遍历col次
        for (int j = 0; j < col; j++) {
            int r = 0;
            int c = j;
            while (r < row && c >= 0)
                System.out.println(A[r++][c--]);
        }
        // 然后以第col-1列，行递增为起点遍历row-1次
        for (int i = 1; i < row; i++) {
            int r = i;
            int c = col - 1;
            while (r < row && c >= 0)
                System.out.println(A[r++][c--]);
        }
    }

从左下到右上

public static void main(String[] args) {
        int[][] matrix = new int[][]{
                new int[]{2, 3, 5,10},
                new int[]{5, 2, 4, 1},
                new int[]{3, 3, 1, 1}
        };

        process(matrix);

    }

    private static void process(int[][] A) {
        int row = A.length;
        int col = A[0].length;
        for(int j = 0;j=0&&c>=0)
            System.out.println(A[r--][c--]);
        }
        for(int i = row - 1;i >= 0; i--){
            int r = i;
            int c = col-1;
            while(r>=0&&c>=0){
                System.out.println(A[r--][c--]);
            }
        }
     }