用java生成5个不同的随机数

import java.util.Random;

class RandomTest
{
public static void main(String[] args)
{
Random r = new Random();

int[] arr = new int[5];

int i = 1;
//包含0，不包含10
arr[0] = r.nextInt(10);

while(i<5){
int a = r.nextInt(10);
if(unContains(arr,a))
arr[i++] = a;
}

for(int k=0;k<arr.length;k++){
System.out.println(arr[k]);
}
}

public static boolean unContains(int[] arr,int a){
for(int i=0;i<5;i++){
if(arr[i]==a){
return false;
}
}

return true;
}
}