上传文件至 'w8'

w8/Cache.java

@@ -0,0 +1,32 @@
+package fx;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Cache<K, V> {
+    private final Map<K, V> storage = new HashMap<>();
+
+    public void put(K key, V value) {
+        storage.put(key, value);
+    }
+
+    public V get(K key) {
+        return storage.get(key);
+    }
+
+    public boolean containsKey(K key) {
+        return storage.containsKey(key);
+    }
+
+    public void remove(K key) {
+        storage.remove(key);
+    }
+
+    public void clear() {
+        storage.clear();
+    }
+
+    public int size() {
+        return storage.size();
+    }
+}

w8/Pair.java

@@ -0,0 +1,27 @@
+package fx;
+
+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; }
+
+    // swap：交换 key 和 value 的类型和值
+    public Pair<V, K> swap() {
+        return new Pair<>(value, key);
+    }
+
+    @Override
+    public String toString() {
+        return "(" + key + ", " + value + ")";
+    }
+}