上传文件至 'w8'

w8/Pair.java

@@ -0,0 +1,33 @@
+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; }
+
+    // 交换键值的静态方法
+    public static <K, V> Pair<V, K> swap(Pair<K, V> pair) {
+        return new Pair<>(pair.getValue(), pair.getKey());
+    }
+
+    @Override
+    public String toString() {
+        return "Pair{" + "key=" + key + ", value=" + value + '}';
+    }
+
+    public static void main(String[] args) {
+        // 测试
+        Pair<String, Integer> pair = new Pair<>("age", 18);
+        System.out.println("交换前：" + pair);
+
+        Pair<Integer, String> swappedPair = Pair.swap(pair);
+        System.out.println("交换后：" + swappedPair);
+    }
+}