java学习p179

import java.util.Scanner;
public class a1 {
    public static void main(String[] args) {
        Scanner myScanner = new Scanner(System.in);
        int length;
        do {
            System.out.println("请输入二维数组的元素个数");
            length = myScanner.nextInt();
            if (length == 0) {
                System.out.println("你输入的二维数组的元素个数为0，请重新输入");
            }
        }while (length == 0);
        int[][] arr = new int[length][];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = new int[i + 1];
            for (int j = 0; j < i + 1; j++) {
                arr[i][j] = i + 1;
            }
        }
        System.out.println("=====输出结果=====");
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < i + 1; j++) {
                System.out.print(arr[i][j] + "t");
            }
            System.out.println();
        }
    }
}