上传文件至 'w8'

w8/Cache.java

@@ -0,0 +1,75 @@
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+public class Cache<K, V> {
+    private final Map<K, V> store = new HashMap<>();
+    private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
+
+    public void put(K key, V value) {
+        if (key == null || value == null)
+            throw new IllegalArgumentException("Key and value must not be null");
+        lock.writeLock().lock();
+        try {
+            store.put(key, value);
+        } finally {
+            lock.writeLock().unlock();
+        }
+    }
+
+    public V get(K key) {
+        lock.readLock().lock();
+        try {
+            return store.get(key);
+        } finally {
+            lock.readLock().unlock();
+        }
+    }
+
+    public boolean containsKey(K key) {
+        lock.readLock().lock();
+        try {
+            return store.containsKey(key);
+        } finally {
+            lock.readLock().unlock();
+        }
+    }
+
+    public V remove(K key) {
+        lock.writeLock().lock();
+        try {
+            return store.remove(key);
+        } finally {
+            lock.writeLock().unlock();
+        }
+    }
+
+    public void clear() {
+        lock.writeLock().lock();
+        try {
+            store.clear();
+        } finally {
+            lock.writeLock().unlock();
+        }
+    }
+
+    public int size() {
+        lock.readLock().lock();
+        try {
+            return store.size();
+        } finally {
+            lock.readLock().unlock();
+        }
+    }
+
+    public static void main(String[] args) {
+        Cache<String, Integer> cache = new Cache<>();
+        cache.put("one", 1);
+        cache.put("two", 2);
+        System.out.println(cache.get("one"));
+        System.out.println(cache.get("two"));
+        cache.remove("one");
+        System.out.println(cache.containsKey("one"));
+        System.out.println("Cache size: " + cache.size());
+    }
+}

w8/GenericReflectionDemo.java

@@ -0,0 +1,37 @@
+import java.lang.reflect.*;
+import java.util.*;
+
+public class GenericReflectionDemo {
+    private Map<String, List<Integer>> complexField;
+
+    public List<Double> process(Map<String, ? extends Number> map, int value) {
+        return new ArrayList<>();
+    }
+
+    public static void main(String[] args) throws NoSuchFieldException, NoSuchMethodException {
+        Field field = GenericReflectionDemo.class.getDeclaredField("complexField");
+        Type genericType = field.getGenericType();
+        System.out.println("===== 字段泛型信息 =====");
+        if (genericType instanceof ParameterizedType) {
+            ParameterizedType pt = (ParameterizedType) genericType;
+            System.out.println("原始类型: " + pt.getRawType());
+            System.out.println("键的类型: " + pt.getActualTypeArguments()[0]);
+            System.out.println("值的类型: " + pt.getActualTypeArguments()[1]);
+        }
+
+        Method method = GenericReflectionDemo.class.getDeclaredMethod("process", Map.class, int.class);
+        Type returnType = method.getGenericReturnType();
+        System.out.println("\n===== 方法返回类型泛型 =====");
+        System.out.println("返回类型: " + returnType);
+
+        Type[] paramTypes = method.getGenericParameterTypes();
+        System.out.println("\n===== 方法参数泛型 =====");
+        for (Type param : paramTypes) {
+            System.out.println("参数类型: " + param);
+            if (param instanceof ParameterizedType) {
+                ParameterizedType ppt = (ParameterizedType) param;
+                System.out.println("   -> 实际类型参数: " + Arrays.toString(ppt.getActualTypeArguments()));
+            }
+        }
+    }
+}

w8/Pair.java

@@ -0,0 +1,33 @@
+public class Pair<K, V> {
+    private final K key;
+    private final 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 Pair<V, K> swap() {
+        return new Pair<>(this.value, this.key);
+    }
+
+    @Override
+    public String toString() {
+        return "Pair{" + key + " -> " + value + "}";
+    }
+
+    public static void main(String[] args) {
+        Pair<String, Integer> p1 = new Pair<>("age", 25);
+        System.out.println("原始: " + p1);
+        Pair<Integer, String> p2 = p1.swap();
+        System.out.println("交换后: " + p2);
+    }
+}