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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.multi;

import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;

/**
 * 值作为集合Set（LinkedHashSet）的Map实现，通过调用putValue可以在相同key时加入多个值，多个值用集合表示
 *
 * @author looly
 *
 * @param  键类型
 * @param  值类型
 * @since 4.3.3
 */
public class SetValueMap extends AbsCollValueMap> {
	private static final long serialVersionUID = 6044017508487827899L;

	// ------------------------------------------------------------------------- Constructor start
	/**
	 * 构造
	 */
	public SetValueMap() {
		this(DEFAULT_INITIAL_CAPACITY);
	}

	/**
	 * 构造
	 *
	 * @param initialCapacity 初始大小
	 */
	public SetValueMap(int initialCapacity) {
		this(initialCapacity, DEFAULT_LOAD_FACTOR);
	}

	/**
	 * 构造
	 *
	 * @param m Map
	 */
	public SetValueMap(Map> m) {
		this(DEFAULT_LOAD_FACTOR, m);
	}

	/**
	 * 构造
	 *
	 * @param loadFactor 加载因子
	 * @param m Map
	 */
	public SetValueMap(float loadFactor, Map> m) {
		this(m.size(), loadFactor);
		this.putAllValues(m);
	}

	/**
	 * 构造
	 *
	 * @param initialCapacity 初始大小
	 * @param loadFactor 加载因子
	 */
	public SetValueMap(int initialCapacity, float loadFactor) {
		super(new HashMap<>(initialCapacity, loadFactor));
	}
	// ------------------------------------------------------------------------- Constructor end

	@Override
	protected Set createCollection() {
		return new LinkedHashSet<>(DEFAULT_COLLECTION_INITIAL_CAPACITY);
	}
}