diff --git a/w8/Cache.java b/w8/Cache.java
new file mode 100644
index 0000000..da48d36
--- /dev/null
+++ b/w8/Cache.java
@@ -0,0 +1,45 @@
+import java.util.HashMap;
+import java.util.Map;
+
+public class Cache<K, V> {
+    private final Map<K, V> map = new HashMap<>();
+
+    // 存入缓存
+    public void put(K key, V value) {
+        map.put(key, value);
+    }
+
+    // 获取缓存
+    public V get(K key) {
+        return map.get(key);
+    }
+
+    // 删除缓存
+    public void remove(K key) {
+        map.remove(key);
+    }
+
+    // 清空缓存
+    public void clear() {
+        map.clear();
+    }
+
+    // 查看大小
+    public int size() {
+        return map.size();
+    }
+
+    // 是否包含某个key
+    public boolean containsKey(K key) {
+        return map.containsKey(key);
+    }
+
+    public static void main(String[] args) {
+        Cache<String, String> cache = new Cache<>();
+        cache.put("user1", "Alice");
+        cache.put("user2", "Bob");
+
+        System.out.println(cache.get("user1"));  // Alice
+        System.out.println(cache.size());        // 2
+    }
+}
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