生成4位网站验证码(要求用数组)

import java.util.*;
class Test2 
{
public static void main(String []args)
{
Random  r = new Random(); 
int []arr = {51,52,53,54,55,56,57,58,
65,66,67,68,69,70,71,72,73,74,75,77,78,80,81,82,83,84,85,86,87,88,89,
97,98,99,100,101,102,104,105,106,107,109,110,112,113,114,115,116,117,118,119,120,121,122};
int []arr1 = new int[4];
int count = 0;
while(count<4)
{
int n=r.nextInt(52)+1;  
if(isHave(arr1,arr[n]))
{  
  arr1[count]=arr[n];  
  count++;  
}  
}


for(int i=0;i<4;i++)
{
System.out.print((char)arr1[i]+" ");
}
}




public static boolean isHave(int [] arr,int b)
{
for(int i=0;i<arr.length;i++)
if(arr[i]==b)
return false;
return true;
}
}