Java经典练习题11

/*
题目：有1、2、3、4四个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？
*/

import java.util.*;

public class Class11 {

public static void main(String[] args) {
int count = 0;
int num;
char[] ch = null;
System.out.println("请输入数字:");
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
ch = s.toCharArray();
System.out.println("不重复的三位数字如下所示:");
for(int i = 0; i < ch.length; i++){
for(int j = 0; j < ch.length; j++){
for(int t = 0; t < ch.length; t++){
if((i == j) || (i == t) || (j == t)){
continue;
}else{
int a = Integer.parseInt(String.valueOf(ch[i]));
int b = Integer.parseInt(String.valueOf(ch[j]));
int c = Integer.parseInt(String.valueOf(ch[t]));
num = a * 100 + b * 10 + c;
count++;
System.out.println(num);
}
}
}
}
System.out.println("总数如下所示:");
System.out.println(count);
}
}