diff --git a/w8/AI协助记录.txt b/w8/AI协助记录.txt
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+# AI协助学习记录
+1. Java泛型为什么不能使用基本类型
+泛型底层为类型擦除，编译后全部向上转为Object。
+基本数据类型不属于对象，无法转为Object，仅能使用包装类。
+
+2. 泛型擦除后为何反射仍可以获取泛型
+运行时实例化的泛型会被完全擦除。
+书写在类、成员变量、方法上的泛型声明会保留在字节码中。
+依靠反射ParameterizedType即可读取原本泛型。
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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.concurrent.ConcurrentHashMap;
+ import java.util.concurrent.Executors;
+ import java.util.concurrent.ScheduledExecutorService;
+ import java.util.concurrent.TimeUnit;
+ public class Cache {
+     private final ConcurrentHashMap<Object,CacheNode> map;
+     private final long timeOut;
+     private ScheduledExecutorService thread;
+     //无参构造永久不过期
+     public Cache(){
+         this(0);
+     }
+     //有参构造设置过期时间
+     public Cache(long timeOut){
+         map = new ConcurrentHashMap<>();
+         this.timeOut = timeOut;
+         //定时清理过期数据
+         thread = Executors.newSingleThreadScheduledExecutor();
+         thread.scheduleAtFixedRate(this::clearTimeOut,2,2,TimeUnit.SECONDS);
+     }
+     //存入缓存
+     public void put(Object key,Object value){
+         put(key,value,timeOut);
+     }
+     //自定义过期时间存放
+     public void put(Object key,Object value,long ttl){
+         long endTime = ttl == 0 ? Long.MAX_VALUE : System.currentTimeMillis()+ttl;
+         map.put(key,new CacheNode(value,endTime));
+     }
+     //获取缓存
+     public Object get(Object key){
+         CacheNode node = map.get(key);
+         if(node == null){
+             return null;
+         }
+         //判断是否过期
+         if(System.currentTimeMillis()>node.endTime){
+             map.remove(key);
+             return null;
+         }
+         return node.value;
+     }
+     //删除缓存
+     public void remove(Object key){
+         map.remove(key);
+     }
+     //清理过期数据
+     private void clearTimeOut(){
+         map.entrySet().removeIf(e->System.currentTimeMillis()>e.getValue().endTime);
+     }
+     //关闭线程防止资源泄露
+     public void close(){
+         thread.shutdown();
+     }
+     //内部存储节点
+     private static class CacheNode{
+         Object value;
+         long endTime;
+         public CacheNode(Object value,long endTime){
+             this.value = value;
+             this.endTime = endTime;
+         }
+     }
+     //测试运行
+     public static void main(String[] args) throws InterruptedException {
+         //设置5秒过期
+         Cache cache = new Cache(5000);
+         cache.put("学号","2026001");
+         System.out.println("存入立刻获取："+cache.get("学号"));
+         Thread.sleep(6000);
+         System.out.println("6秒后获取（已过期）："+cache.get("学号"));
+         cache.close();
+     }
+ }
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diff --git a/w8/GenericReflect.java b/w8/GenericReflect.java
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+++ b/w8/GenericReflect.java
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+import java.lang.reflect.Field;
+ import java.lang.reflect.ParameterizedType;
+ import java.lang.reflect.Type;
+ import java.util.List;
+ public class GenericReflect {
+     private List<String> list;
+     public static void main(String[] args) throws NoSuchFieldException {
+         //利用反射获取被擦除的泛型
+         Field field = GenericReflect.class.getDeclaredField("list");
+         Type type = field.getGenericType();
+         if(type instanceof ParameterizedType){
+             ParameterizedType parameterizedType = (ParameterizedType) type;
+             System.out.println("获取到的泛型类型："+parameterizedType.getActualTypeArguments()[0]);
+         }
+     }
+ }
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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 {
+     private Object key;
+     private Object value;
+     public Pair(Object key, Object value) {
+         this.key = key;
+         this.value = value;
+     }
+     //交换键值
+     public Pair swap(){
+         return new Pair(value,key);
+     }
+     public Object getKey(){
+         return key;
+     }
+     public Object getValue(){
+         return value;
+     }
+     @Override
+     public String toString() {
+         return "键："+key+"  值："+value;
+     }
+     public static void main(String[] args) {
+         Pair p1 = new Pair("姓名","张三");
+         System.out.println("交换前："+p1);
+         Pair p2 = p1.swap();
+         System.out.println("交换后："+p2);
+     }
+ }
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diff --git a/w8/README.md b/w8/README.md
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+++ b/w8/README.md
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+\# Java泛型作业
+
+&#x20;文件功能
+
+&#x20;1. Pair.java：泛型键值对，实现键值交换
+
+&#x20;2. Cache.java：泛型缓存，支持过期自动清理、线程安全
+
+&#x20;3. GenericReflect.java：反射获取被擦除的泛型
+
+
+
+&#x20;编译运行命令
+
+&#x20;编译
+
+&#x20;javac Pair.java
+
+&#x20;javac Cache.java
+
+&#x20;javac GenericReflect.java
+
+&#x20;运行
+
+&#x20;java Pair
+
+&#x20;java Cache
+
+&#x20;java GenericReflect
+
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