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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.map;

import cn.hutool.core.util.ReferenceUtil;

import java.lang.ref.Reference;
import java.util.concurrent.ConcurrentMap;

/**
 * 线程安全的WeakMap实现

 * 参考：jdk.management.resource.internal.WeakKeyConcurrentHashMap
 *
 * @param  键类型
 * @param  值类型
 * @author looly
 * @since 5.8.0
 */
public class WeakConcurrentMap extends ReferenceConcurrentMap {

	/**
	 * 构造
	 */
	public WeakConcurrentMap() {
		this(new SafeConcurrentHashMap<>());
	}

	/**
	 * 构造
	 *
	 * @param raw {@link ConcurrentMap}实现
	 */
	public WeakConcurrentMap(ConcurrentMap, V> raw) {
		super(raw, ReferenceUtil.ReferenceType.WEAK);
	}
}