diff --git a/W8/Pair.java b/W8/Pair.java
new file mode 100644
index 0000000..a766a7f
--- /dev/null
+++ b/W8/Pair.java
@@ -0,0 +1,40 @@
+package com.example.crawler;
+
+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 void setKey(K key) {
+        this.key = key;
+    }
+
+    public V getValue() {
+        return value;
+    }
+
+    public void setValue(V value) {
+        this.value = value;
+    }
+
+    // 静态方法：交换Pair的键和值
+    public static <K, V> Pair<V, K> swap(Pair<K, V> pair) {
+        return new Pair<>(pair.getValue(), pair.getKey());
+    }
+
+    @Override
+    public String toString() {
+        return "Pair{" +
+                "key=" + key +
+                ", value=" + value +
+                '}';
+    }
+}
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