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51 lines
1.2 KiB
51 lines
1.2 KiB
package com.homework; // 你的包声明，必须和你的目录结构一致
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public class Pair<K, V> {
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private K key;
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private V value;
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// 构造方法
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public Pair(K key, V value) {
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this.key = key;
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this.value = value;
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}
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// Getter & Setter
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public K getKey() {
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return key;
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}
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public void setKey(K key) {
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this.key = key;
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}
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public V getValue() {
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return value;
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}
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public void setValue(V value) {
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this.value = value;
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}
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// 作业要求的 swap 方法：交换 key 和 value
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public Pair<V, K> swap() {
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return new Pair<>(this.value, this.key);
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}
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// 重写 toString，方便打印
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@Override
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public String toString() {
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return "key: " + key + ", value: " + value;
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}
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// 主方法：测试用
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public static void main(String[] args) {
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// 测试 Pair<String, Integer>
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Pair<String, Integer> pair = new Pair<>("年龄", 20);
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System.out.println("交换前：" + pair);
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// 调用 swap 方法
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Pair<Integer, String> swappedPair = pair.swap();
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System.out.println("交换后：" + swappedPair);
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}
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}
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