上传文件至 'W8'

W8/Pair.java

@@ -0,0 +1,48 @@
+package com.example.W8;
+
+// 文件名：Pair.java
+ 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 & setter
+    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;
+    }
+
+    // 交换两个Pair
+    public static <K, V> void swap(Pair<K, V> p1, Pair<K, V> p2) {
+        K tempKey = p1.key;
+        V tempValue = p1.value;
+
+        p1.setKey(p2.getKey());
+        p1.setValue(p2.getValue());
+
+        p2.setKey(tempKey);
+        p2.setValue(tempValue);
+    }
+
+    // 打印用
+    @Override
+    public String toString() {
+        return "Pair{key=" + key + ", value=" + value + "}";
+    }
+}

W8/PairTest.java

@@ -0,0 +1,21 @@
+package com.example.W8;
+
+// 导入Pair类
+import com.example.W8.Pair;
+
+public class PairTest {
+    public static void main(String[] args) {
+        Pair<String, Integer> p1 = new Pair<>("小明", 18);
+        Pair<String, Integer> p2 = new Pair<>("小红", 19);
+
+        System.out.println("交换前：");
+        System.out.println("p1 = " + p1);
+        System.out.println("p2 = " + p2);
+
+        Pair.swap(p1, p2);
+
+        System.out.println("\n交换后：");
+        System.out.println("p1 = " + p1);
+        System.out.println("p2 = " + p2);
+    }
+}