From 7e9ae0104d59f3b77f8a5275f5c833dece8f0060 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Fri, 31 Jul 2026 11:45:48 +0800
Subject: [PATCH] =?UTF-8?q?s-day02-=E6=B3=9B=E5=9E=8B=E9=80=9A=E9=85=8D?=
 =?UTF-8?q?=E7=AC=A6=E7=9A=84=E4=BD=BF=E7=94=A8(=E4=BA=86=E8=A7=A3)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/com/inmind/generic_tpf08/Demo10.java  | 33 +++++++++++++++++++
 .../src/com/inmind/generic_tpf08/Person.java  | 22 +++++++++++++
 .../src/com/inmind/generic_tpf08/Student.java | 19 +++++++++++
 3 files changed, 74 insertions(+)
 create mode 100644 s-day02/src/com/inmind/generic_tpf08/Demo10.java
 create mode 100644 s-day02/src/com/inmind/generic_tpf08/Person.java
 create mode 100644 s-day02/src/com/inmind/generic_tpf08/Student.java

diff --git a/s-day02/src/com/inmind/generic_tpf08/Demo10.java b/s-day02/src/com/inmind/generic_tpf08/Demo10.java
new file mode 100644
index 0000000..be20716
--- /dev/null
+++ b/s-day02/src/com/inmind/generic_tpf08/Demo10.java
@@ -0,0 +1,33 @@
+package com.inmind.generic_tpf08;
+
+import java.util.ArrayList;
+
+/*
+13.泛型通配符的使用(了解) ?
+当我们要接受一个数据类型，它的泛型不一致，要使用泛型通配符，匹配？
+ */
+public class Demo10 {
+    public static void main(String[] args) {
+        //创建人和学生的2个集合
+        ArrayList<Person> list1 = new ArrayList<>();
+        list1.add(new Person("小王1", 18));
+        list1.add(new Person("小王2", 18));
+        //遍历打印集合中的内容
+        showList(list1);
+
+        ArrayList<Student> list2 = new ArrayList<>();
+        list2.add(new Student("小王3", 18));
+        list2.add(new Student("小王4", 18));
+        //遍历打印集合中的内容
+        showList(list2);
+    }
+
+    /*
+        ArrayList<Object> 这样写的话是错的，泛型是没有多态的
+     */
+    public static void showList(ArrayList<?> list){
+        for (Object o : list) {
+            System.out.println(o);
+        }
+    }
+}
diff --git a/s-day02/src/com/inmind/generic_tpf08/Person.java b/s-day02/src/com/inmind/generic_tpf08/Person.java
new file mode 100644
index 0000000..2dab766
--- /dev/null
+++ b/s-day02/src/com/inmind/generic_tpf08/Person.java
@@ -0,0 +1,22 @@
+package com.inmind.generic_tpf08;
+
+public class Person {
+    String name;
+    int age;
+
+    public Person() {
+    }
+
+    public Person(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return "Person{" +
+                "name='" + name + '\'' +
+                ", age=" + age +
+                '}';
+    }
+}
diff --git a/s-day02/src/com/inmind/generic_tpf08/Student.java b/s-day02/src/com/inmind/generic_tpf08/Student.java
new file mode 100644
index 0000000..daf605e
--- /dev/null
+++ b/s-day02/src/com/inmind/generic_tpf08/Student.java
@@ -0,0 +1,19 @@
+package com.inmind.generic_tpf08;
+
+public class Student extends Person{
+
+    public Student() {
+    }
+
+    public Student(String name, int age) {
+        super(name, age);
+    }
+
+    @Override
+    public String toString() {
+        return "Student{" +
+                "age=" + age +
+                ", name='" + name + '\'' +
+                '}';
+    }
+}