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Hutool核心，包括集合、字符串、Bean等工具

There is a newer version: 5.8.33

package cn.hutool.core.map;

import java.util.Map;

/**
 * 自定义键的Map，默认HashMap实现
 *
 * @param  键类型
 * @param  值类型
 * @author Looly
 * @since 4.0.7
 */
public abstract class CustomKeyMap extends TransMap {
	private static final long serialVersionUID = 4043263744224569870L;

	/**
	 * 构造

	 * 通过传入一个Map从而确定Map的类型，子类需创建一个空的Map，而非传入一个已有Map，否则值可能会被修改
	 *
	 * @param emptyMap Map 被包装的Map，必须为空Map，否则自定义key会无效
	 * @since 3.1.2
	 */
	public CustomKeyMap(Map emptyMap) {
		super(emptyMap);
	}

	@Override
	protected V customValue(Object value) {
		//noinspection unchecked
		return (V)value;
	}
}