谢谢各位大佬了

看不见图片

试试 格式 输出，java有格式化输出

\t    可以设置固定格式

public class Test {

    private static String formatData(final int len,
                                     final String data) {
        return String.format("%"+len+"s",data);
    }

    public static void main(String... args) {

        final int MAX = 10;
        final int LEN = Integer.toString(MAX).length()*2 + 2 + Integer.toString(MAX*MAX).length();

        for (int r = 1; r <= MAX; r++) {
            for (int s = MAX - r + 1; s < MAX; s++) {
                System.out.print(formatData(LEN,"\t"));
            }
            for (int c = r; c <= MAX; c++) {
                final String sData = String.format("%d*%d=%d", r, c, (r * c));
                System.out.print(formatData(LEN,sData));
                System.out.print((c == MAX) ? '\n' : '\t');
            }
        }

    }

}

[此贴子已经被作者于2017-12-21 17:12编辑过]

package com.huawei.test;

public class Test {

    public static void main(String[] args) {
        for(int i = 1; i < 10; i++) {
            for(int j = 1; j < 10; j++) {
                System.out.printf(i <= j ? "%d*%d=%d\t" : "\t", i, j, i*j);
            }    
            System.out.println();
        }
    }
}

public class Test {

    private static String formatData(final int len,
                                     final String data) {
        return String.format("%"+len+"s",data);
    }

    public static void main(String... args) {

        final int MAX = 10;
        final int LEN = Integer.toString(MAX).length()*2 + 2 + Integer.toString(MAX*MAX).length();

        for (int r = 1; r <= MAX; r++) {
            for (int s = MAX - r + 1; s < MAX; s++) {
                System.out.print(formatData(LEN,"\t"));
            }
            for (int c = r; c <= MAX; c++) {
                final String sData = String.format("%d*%d=%d", r, c, (r * c));
                System.out.print(formatData(LEN,sData));
                System.out.print((c == MAX) ? '\n' : '\t');
            }
        }

    }

}

明显不符合要求~~~