W8

W8/Pair.java

@@ -0,0 +1,26 @@
+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 和 Setter
+    public K getKey() { return key; }
+    public V getValue() { return value; }
+    public void setKey(K key) { this.key = key; }
+    public void setValue(V value) { this.value = value; }
+
+    @Override
+    public String toString() {
+        return "(" + key + ", " + value + ")";
+    }
+
+    // 静态交换方法
+    public static <T, U> Pair<U, T> swap(Pair<T, U> p) {
+        return new Pair<>(p.getValue(), p.getKey());
+    }
+}