W9-李思彤-202506050313

Cache.java

@@ -0,0 +1,32 @@
+package com.homework;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Cache<K, V> {
+    private final Map<K, V> map;
+
+    public Cache() {
+        map = new HashMap<>();
+    }
+
+    public void put(K key, V value) {
+        map.put(key, value);
+    }
+
+    public V get(K key) {
+        return map.get(key);
+    }
+
+    public void remove(K key) {
+        map.remove(key);
+    }
+
+    public void clear() {
+        map.clear();
+    }
+
+    public boolean containsKey(K key) {
+        return map.containsKey(key);
+    }
+}

Pair.java

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+package com.homework;
+
+public class Pair<K, V> {
+    private K key;
+    private V value;
+
+    public Pair(K key, V value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    public void swap() {
+        K temp = key;
+        key = (K) value;
+        value = (V) temp;
+    }
+
+    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;
+    }
+
+    @Override
+    public String toString() {
+        return "key: " + key + ", value: " + value;
+    }
+}

TestMain.java

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+package com.homework;
+
+public class TestMain {
+    public static void main(String[] args) {
+        Pair<String, Integer> pair = new Pair<>("年龄", 20);
+        System.out.println("交换前：" + pair);
+        pair.swap();
+        System.out.println("交换后：" + pair);
+
+        Cache<String, String> cache = new Cache<>();
+        cache.put("name", "张三");
+        cache.put("id", "20260001");
+        System.out.println("缓存获取name：" + cache.get("name"));
+        System.out.println("缓存是否包含id：" + cache.containsKey("id"));
+    }
+}