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33 lines
751 B
33 lines
751 B
public class Pair<K, V> {
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private final K key;
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private final V value;
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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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public K getKey() {
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return 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 Pair<V, K> swap() {
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return new Pair<>(this.value, this.key);
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}
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@Override
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public String toString() {
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return "Pair{" + key + " -> " + value + "}";
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}
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public static void main(String[] args) {
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Pair<String, Integer> p1 = new Pair<>("age", 25);
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System.out.println("原始: " + p1);
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Pair<Integer, String> p2 = p1.swap();
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System.out.println("交换后: " + p2);
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}
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}
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