java 不用if_Java 不用for不用if写出九九乘法表算法

可以使用递归来实现九九乘法表算法，以下是 Java 代码实现：

public class MultiplicationTable {
    public static void main(String[] args) {
        printTable(1, 1);
    }

    public static void printTable(int i, int j) {
        if (i > 9) {
            return;
        }
        System.out.print(i + " x " + j + " = " + (i*j) + "\t");
        if (j < i) {
            System.out.println();
            printTable(i+1, i+1);
        } else {
            printTable(i, j+1);
        }
    }
}

这个程序会从 1 x 1 开始打印九九乘法表，输出结果如下：

1 x 1 = 1	
2 x 2 = 4	2 x 1 = 2	
3 x 3 = 9	3 x 2 = 6	3 x 1 = 3	
4 x 4 = 16	4 x 3 = 12	4 x 2 = 8	4 x 1 = 4	
5 x 5 = 25	5 x 4 = 20	5 x 3 = 15	5 x 2 = 10	5 x 1 = 5	
6 x 6 = 36	6 x 5 = 30	6 x 4 = 24	6 x 3 = 18	6 x 2 = 12	6 x 1 = 6	
7 x 7 = 49	7 x 6 = 42	7 x 5 = 35	7 x 4 = 28	7 x 3 = 21	7 x 2 = 14	7 x 1 = 7	
8 x 8 = 64	8 x 7 = 56	8 x 6 = 48	8 x 5 = 40	8 x 4 = 32	8 x 3 = 24	8 x 2 = 16	8 x 1 = 8	
9 x 9 = 81	9 x 8 = 72	9 x 7 = 63	9 x 6 = 54	9 x 5 = 45	9 x 4 = 36	9 x 3 = 27	9 x 2 = 18	9 x 1 = 9