java/W8/Pair.java

package com.example.W8;

// 文件名：Pair.java
 public class Pair<K, V> {
    private K key;
    private V value;

    // 构造方法
    public Pair(K key, V value) {
        this.key = key;
        this.value = value;
    }

    // getter & setter
    public K getKey() {
        return key;
    }

    public void setKey(K key) {
        this.key = key;
    }

    public V getValue() {
        return value;
    }

    public void setValue(V value) {
        this.value = value;
    }

    // 交换两个Pair
    public static <K, V> void swap(Pair<K, V> p1, Pair<K, V> p2) {
        K tempKey = p1.key;
        V tempValue = p1.value;

        p1.setKey(p2.getKey());
        p1.setValue(p2.getValue());

        p2.setKey(tempKey);
        p2.setValue(tempValue);
    }

    // 打印用
    @Override
    public String toString() {
        return "Pair{key=" + key + ", value=" + value + "}";
    }
}