1、九九乘法表

/*乘法口诀表*/
        for (int i = 1;i<=9;i++){
            for ( int j = 1;j < i;j++){
                System.out.print(j + "*" + i + "="+(i*j) + "\t");
            }
            System.out.println();
        }
    }

2、打印三角形

/*打印三角形*/
        //定义总行数
        int line = 5;
        for (int x = 0;x < line; x++){
            for (int y = 0;y < line - x;y++){
                System.out.print("  ");
            }
            for (int y = 0;y <= x;y++){
                System.out.print("* ");
            }
            System.out.println();
        }