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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.lang;

import cn.hutool.core.clone.CloneSupport;

import java.io.Serializable;
import java.util.Objects;

/**
 * 键值对对象，只能在构造时传入键值
 *
 * @param  键类型
 * @param  值类型
 * @author looly
 * @since 4.1.5
 */
public class Pair extends CloneSupport> implements Serializable {
	private static final long serialVersionUID = 1L;

	protected K key;
	protected V value;

	/**
	 * 构建{@code Pair}对象
	 *
	 * @param    键类型
	 * @param    值类型
	 * @param key   键
	 * @param value 值
	 * @return {@code Pair}
	 * @since 5.4.3
	 */
	public static  Pair of(K key, V value) {
		return new Pair<>(key, value);
	}

	/**
	 * 构造
	 *
	 * @param key   键
	 * @param value 值
	 */
	public Pair(K key, V value) {
		this.key = key;
		this.value = value;
	}

	/**
	 * 获取键
	 *
	 * @return 键
	 */
	public K getKey() {
		return this.key;
	}

	/**
	 * 获取值
	 *
	 * @return 值
	 */
	public V getValue() {
		return this.value;
	}

	@Override
	public String toString() {
		return "Pair [key=" + key + ", value=" + value + "]";
	}

	@Override
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o instanceof Pair) {
			Pair pair = (Pair) o;
			return Objects.equals(getKey(), pair.getKey()) &&
					Objects.equals(getValue(), pair.getValue());
		}
		return false;
	}

	@Override
	public int hashCode() {
		//copy from 1.8 HashMap.Node
		return Objects.hashCode(key) ^ Objects.hashCode(value);
	}
}