java固定大小map_固定长度的Map，求优化代码

package org.nutz.dao;

import java.util.AbstractMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.LinkedList;

import java.util.Map;

import java.util.Queue;

import java.util.Set;

/**

* The PooledMap is used to cache some Objects in a certain count.

*

* @param

* @param

*/

public class PooledMap extends AbstractMap{

private int maxCount = 10000;

private Queue queue = new LinkedList();

/**

* The Entry for this Map.

* @author Andy Han

*

*/

private class Entry implements Map.Entry{

private Key key;

private Value value;

public Entry(Key key, Value value){

this.key = key;

this.value = value;

}

@Override

public Strin