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w8/kv.java

@@ -0,0 +1,31 @@
+package w8;
+
+public class Pair<K, V> {
+    private K key;
+    private V value;
+
+    public Pair(K key, V value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    public Pair<V, K> swap() {
+        return new Pair<>(this.value, this.key);
+    }
+
+    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;
+    }
+}

w8/kv1.java

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+package w8;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Cache<K, V> {
+    private final Map<K, V> cacheMap;
+
+    public Cache() {
+        cacheMap = new HashMap<>();
+    }
+
+    public void put(K key, V value) {
+        cacheMap.put(key, value);
+    }
+
+    public V get(K key) {
+        return cacheMap.get(key);
+    }
+
+    public void remove(K key) {
+        cacheMap.remove(key);
+    }
+
+    public void clear() {
+        cacheMap.clear();
+    }
+
+    public int size() {
+        return cacheMap.size();
+    }
+}

w9/Article.java

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+package w9;
+
+import java.util.Date;
+public class Article {
+    private String title;
+    private String content;
+    private String author;
+    private Date publishDate;
+
+    public Article() {}
+    public Article(String title, String content, String author, Date publishDate) {
+        this.title = title;
+        this.content = content;
+        this.author = author;
+        this.publishDate = publishDate;
+    }
+
+    public String getAuthor() { return author; }
+    public void setAuthor(String author) { this.author = author; }
+    public Date getPublishDate() { return publishDate; }
+    public void setPublishDate(Date publishDate) { this.publishDate = publishDate; }
+}

w9/HistoryCommand.java

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+package w9;
+
+import java.util.ArrayList;
+import java.util.List;
+public class HistoryCommand {
+    private List<String> commandList = new ArrayList<>();
+
+
+    public void addCommand(String cmd) {
+        commandList.add(cmd);
+    }
+    public List<String> getHistory() {
+        return new ArrayList<>(commandList); 
+    }
+}

w9/zongjie.txt

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+直接返回的List<Article>是引用传递，外部代码可直接修改集合内 Article 对象或增删元素，存在数据安全风险。其一，外部修改 Article 的标题、作者等字段，会直接篡改内存中原始数据，引发数据不一致；其二，外部可随意新增、删除集合元素，破坏数据完整性；其三，多线程场景下，共享集合无同步机制，易出现并发异常、脏数据。需返回集合副本或不可变集合，避免外部直接操作原始数据。