W8-徐景旺-202414010701

W8/Cache.java

@@ -0,0 +1,31 @@
+import java.util.HashMap;
+import java.util.Map;
+public class Cache<K, V> {
+    // 使用 HashMap 作为底层存储容器
+    private Map<K, V> storage = new HashMap<>();
+    public void put(K key, V value) {
+        storage.put(key, value);
+    }
+    public V get(K key) {
+        return storage.get(key);
+    }
+    public void remove(K key) {
+        storage.remove(key);
+    }
+    public boolean containsKey(K key) {
+        return storage.containsKey(key);
+    }
+    public int size() {
+        return storage.size();
+    }
+    public static void main(String[] args) {
+        Cache<String, String> userCache = new Cache<>();
+        userCache.put("user:1001", "Alice");
+        userCache.put("user:1002", "Bob");
+        String user1 = userCache.get("user:1001");
+        System.out.println("获取到的用户: " + user1);
+        if (userCache.containsKey("user:1002")) {
+            System.out.println("用户 1002 在缓存中");
+        }
+    }
+}

W8/Pair.java

@@ -0,0 +1,37 @@
+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;
+    }
+    public Pair<V, K> swap() {
+        return new Pair<>(this.value, this.key);
+    }
+    @Override
+    public String toString() {
+        return "(" + key + ", " + value + ")";
+    }
+    public static void main(String[] args) {
+        Pair<String, Integer> original = new Pair<>("Age", 25);
+        System.out.println("原始 Pair: " + original);
+
+        // 调用 swap 方法
+        Pair<Integer, String> swapped = original.swap();
+        System.out.println("交换后 Pair: " + swapped);
+    }
+}