Java基础学习1--HashMap

import java.util.*;
public class HashMapTest2 {

public static void main(String[] args){
HashMap h1=new HashMap();
Random r1=new Random();
for(int i=0;i<1000;i++){
Integer t=new Integer(r1.nextInt(20));
if(h1.containsKey(t))
((Ctime)h1.get(t)).count++;
else
h1.put(t, new Ctime());
}
System.out.println(h1);
}

}

class Ctime{
int count=1;
public String toString(){
return Integer.toString(count);
}
}