今日头条--二维数组矩形输出

Posted 2020-12-31 mlz-2019

public class PrintArrayLoop {

    public static void printArrayForLoopWay(int[][] arr) {
        if (arr == null || arr.length == 0 || arr[0] == null || arr[0].length == 0) {
            return;
        }
        int row = arr.length;
        int column = arr[0].length;
        int number = row > column ? (column - 1) : (row - 1);
        int i = 0, j = 0;
        for (int k = 0; k < number; k++) {
            if (j > column - 1 - k) {
                return;
            }
            for (j = k; j <= column - 1 - k; j++) {
                System.out.printf(arr[i][j] + " ");
            }
            j--;
            i = k + 1;
            if (i > row - k - 1) {
                return;
            }
            for (; i <= row - k - 1; i++) {
                System.out.printf(arr[i][j] + " ");
            }
            i--;
            j = column - k - 2;
            if (j < k) {
                return;
            }
            for (; j >= k; j--) {
                System.out.printf(arr[i][j] + " ");
            }
            j++;
            i = row - 2 - k;
            if (i < k + 1) {
                return;
            }
            for (; i >= k + 1; i--) {
                System.out.printf(arr[i][j] + " ");
            }
            i++;
            j++;
        }
    }

    public static void main(String [] args){
        int[][] arr=
                {{1,2,3,4,5,6},{11,12,13,14,15,16},{21,22,23,24,25,26},{31,32,33,34,35,36},{41,42,43,44,45,46},{51,52,53,54,55,56}};
        printArrayForLoopWay(arr);
    }
}