Java 随机数 Random类

import java.util.Arrays;
import java.util.Random;

public class Test {
    
    
    public static void main(String[] args) {
    
    
        Random random = new Random();
        int[] a= new int[5];
        for(int i=0;i<a.length;i++){
    
    
            a[i]=-1;
        }
        int index=0;
        while(index<5){
    
    
            int num = random.nextInt(5);
            System.out.println("随机数为："+num);
            if(!(simly(a,num))){
    
    
                a[index++]=num;
            }
        }
        System.out.println(Arrays.toString(a));
    }
    public static boolean simly(int[] a,int num){
    
    
        for(int j=0;j< a.length;j++){
    
    
            if(a[j]==num)
                return true;
        }
        return false;
    }
}