diff --git a/W8/491f1ccd3fae491259a53efeebf91af4.png b/W8/491f1ccd3fae491259a53efeebf91af4.png
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diff --git a/W8/Cache.java b/W8/Cache.java
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+++ b/W8/Cache.java
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+import java.util.HashMap;
+import java.util.Map;
+
+public class Cache<K, V> {
+    private Map<K, V> cache = new HashMap<>();
+
+    public void put(K key, V value) {
+        cache.put(key, value);
+    }
+
+    public V get(K key) {
+        return cache.get(key);
+    }
+
+    public void remove(K key) {
+        cache.remove(key);
+    }
+
+    public void clear() {
+        cache.clear();
+    }
+
+    public int size() {
+        return cache.size();
+    }
+
+    public boolean containsKey(K key) {
+        return cache.containsKey(key);
+    }
+}
diff --git a/W8/Pair.java b/W8/Pair.java
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+++ b/W8/Pair.java
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+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 void swap() {
+        K tempKey = key ;
+    }
+    @Override
+    public String toString() {
+        return "(" + key+  "," + value + ")" ;
+    }
+}
diff --git a/W8/TestCache.java b/W8/TestCache.java
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+++ b/W8/TestCache.java
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+public class TestCache {
+    public static void main(String[] args) {
+        Cache<String, Integer> cache = new Cache<>();
+
+        cache.put("张三", 85);
+        cache.put("李四", 90);
+        cache.put("王五", 78);
+
+        System.out.println("张三的分数：" + cache.get("张三"));
+        System.out.println("李四的分数：" + cache.get("李四"));
+
+        cache.remove("王五");
+        System.out.println("王五的分数：" + cache.get("王五"));
+
+
+        System.out.println("是否包含张三：" + cache.containsKey("张三"));
+        System.out.println("缓存大小：" + cache.size());
+
+        cache.clear();
+        System.out.println("清空后大小：" + cache.size());  
+    }
+}