上传文件至 'w8'

w8/Pair.java

@@ -0,0 +1,42 @@
+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 V getValue() {
+        return value;
+    }
+
+    public void setKey(K key) {
+        this.key = key;
+    }
+
+    public void setValue(V value) {
+        this.value = value;
+    }
+
+    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) {
+        Pair<String, Integer> original = new Pair<>("age", 25);
+        System.out.println("Original: " + original);
+        
+        Pair<Integer, String> swapped = Pair.swap(original);
+        System.out.println("Swapped: " + swapped);
+    }
+}