java 等腰三角形 直角三角形 九九乘法表 关键代码

等腰三角形:
                Scanner input = new Scanner(System.in);
                int row=0;
		System.out.print("请输入直角三角形的行数：");
		int row = input.nextInt();
		for (int i = 1; i <= row; i++) {
			for (int k = 1; k <= row - i; k++) {
				System.out.print(" ");
			}
			for (int j = 1; j <= 2 * i - 1; j++) {
				System.out.print("*");
			}
			System.out.print("\n")

 12345直角三角形:
               Scanner input = new Scanner(System.in);
		int rows = 0;
		System.out.println("请输入行数:");
		rows = input.nextInt();		
		for (int i = 1; i <=rows; i++) {
			for (int k = 1; k<=i; k++) {
				System.out.print(k);
			}
			System.out.print("\n");
		}

 九九乘法表:

                 Scanner input =new Scanner(System.in);
		int row=9;
		for(int i=1;i<=row;i++){
			for(int k=1;k<=i;k++){
				System.out.print(k+"*"+i+"="+k*i+"   ");
			}System.out.print("\n");
		}