泛型类

zhangzhanpei · zhangzhanpei · commit cbd33b8e7f34 · 2018-08-13T23:36:43.000+08:00
diff --git a/generic/GenericClass.java b/generic/GenericClass.java
@@ -0,0 +1,28 @@
+package generic;
+
+/**
+ * 泛型类，典型的就是各种容器类如 List、Set、Map
+ * @param <T>
+ */
+class GenericClass<T> {
+    private T value;
+
+    GenericClass(T value) {
+        this.value = value;
+    }
+
+    public T getValue() {
+        return this.value;
+    }
+}
+
+class Test {
+    public static void main(String[] args) {
+        // 实例化时指定类型
+        GenericClass<String> genericString = new GenericClass<>("Generic Class");
+        System.out.println(genericString.getValue());
+        
+        GenericClass<Integer> genericInteger = new GenericClass<>(666);
+        System.out.println(genericInteger.getValue());
+    }
+}
