类型通配符上限

CPU-Code · CPU-Code · commit a04fac22b53e · 2021-12-20T15:09:53.000+08:00
diff --git a/generics/README.md b/generics/README.md
@@ -18,7 +18,7 @@
 - [x] [泛型方法返回三个可比较对象的最大值](src/main/java/com/cpucode/generics/maximum/MaximumTest.java)
 - [x] [定义一个泛型类](src/main/java/com/cpucode/generics/box/BoxTest.java)
 - [x] [类型通配符?](src/main/java/com/cpucode/generics/genericTest/GenericTest.java)
-
+- [x] [类型通配符上限](src/main/java/com/cpucode/generics/genericUper/GenericUperTest.java)
 
 - [返回目录](#文件目录)
 
diff --git a/generics/src/main/java/com/cpucode/generics/genericUper/GenericUperTest.java b/generics/src/main/java/com/cpucode/generics/genericUper/GenericUperTest.java
@@ -0,0 +1,33 @@
+package com.cpucode.generics.genericUper;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 类型通配符上限
+ *
+ * @author : cpucode
+ * @date : 2021/12/20 15:06
+ * @github : https://github.com/CPU-Code
+ * @csdn : https://blog.csdn.net/qq_44226094
+ */
+public class GenericUperTest {
+    public static void main(String[] args) {
+        List<String> name = new ArrayList<>();
+        List<Integer> age = new ArrayList<>();
+        List<Number> number = new ArrayList<>();
+
+        name.add("cpuCode");
+        age.add(20);
+        number.add(222);
+
+        //getUperNumber(name);
+
+        getUperNumber(age);
+        getUperNumber(number);
+    }
+
+    public static void getUperNumber(List<? extends Number> data) {
+        System.out.println("data :" + data.get(0));
+    }
+}
