pair

W8/Pair.java

@@ -0,0 +1,47 @@
+public class Pair<K, V> {
+    private K key;
+    private V value;
+
+    public Pair(K key, V value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    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;
+    }
+
+    // swap 方法：交换 key 和 value
+    public Pair<V, K> swap() {
+        return new Pair<>(this.value, this.key);
+    }
+
+    @Override
+    public String toString() {
+        return "Pair{" +
+                "key=" + key +
+                ", value=" + value +
+                '}';
+    }
+
+    // 测试主方法
+    public static void main(String[] args) {
+        Pair<String, Integer> pair = new Pair<>("年龄", 20);
+        System.out.println("原对象：" + pair);
+
+        Pair<Integer, String> swapped = pair.swap();
+        System.out.println("交换后：" + swapped);
+    }
+}