泛型方法

Author: gogobook

docs/CH12.md

@@ -517,8 +517,26 @@ Generic methods are methods that introduce their own type parameters. This is si
 The syntax for a generic method includes a type parameter, inside angle brackets, and appears before the method's return type. For static generic methods, the type parameter section must appear before the method's return type.
 泛型方法的語法帶有一個類型參數，置於方法返回類型之前；對靜態的泛型方法，類型參數部分必須出現方法的返回類型之前。
 
+The Util class includes a generic method, compare, which compares two Pair objects:
+在Util類別內有一個泛型方法，用以比較一對物件。可以看到static 後接角括號用以宣告在方法內的類型參數的泛型，然後方法的類型參數才需要將類型參數及其泛型寫上。返回值是布林類型。
 
+```java
+public class Util {
+    public static <K, V> boolean compare(Pair<K, V> p1, Pair<K, V> p2) {
+        return p1.getKey().equals(p2.getKey()) &&
+               p1.getValue().equals(p2.getValue());
+    }
+}
+```
+泛型pair ，角括號宣告了二個泛型，作為泛型類別的屬性。
 
+```java
+public class Pair<K, V> {
 
+    private K key;
+    private V value;
+...
+}
+```