1.2.3.4 組成無重複的三位數

isNumRepeat

package com.example.myapplication3.app;

import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;



public class Test {

    public static void main(String[] args) {

        List<Integer> temp = new ArrayList<Integer>();
        for (int i = 1; i <=4 ; i++) {
            for (int j = 1; j <=4 ; j++) {
                for (int k = 1; k <=4 ; k++) {
                    temp.add(i*100+j*10+k);

                }

            }
        }
        for (int a : temp) {
            if (isRepeat(Integer.toString(a))){

                System.out.println(a);

            }
        }

    }

    public static boolean isRepeat(String inPut){

        int s1 = Integer.parseInt(inPut.substring(0,1));
        int s2 = Integer.parseInt(inPut.substring(1,2));
        int s3 = Integer.parseInt(inPut.substring(2,3));


        if (s1 == s2 || s2 == s3 || s1 == s3) {
            return false;
        }else {
            return true;
        }
    }

}