上传W8

W8/Pair.java

@@ -0,0 +1,31 @@
+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;
+    }
+    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 +
+                '}';
+    }
+}