package com.xiaowu.demo;/** * 有1、2、3、4个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？ *  *  * @author WQ * */public class Demo11 {    public static void main(String[] args) {        number();    }    public static void number() {        int count = 0;        for (int x = 1; x < 5; x++) {            for (int y = 1; y < 5; y++) {                for (int z = 1; z < 5; z++) {                    if (x != y && y != z && x != z) {                        int number = x * 100 + y * 10 + z;                        System.out.print(number + "\t");                        count++;                        if (count % 10 == 0) {                            System.out.println();                        }                    }                }            }        }        System.out.println("\n共有" + count + "个三位数");    }}