From d285432c36fa49b346ec76a22eb72f29d4909c23 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Thu, 22 Jan 2026 15:27:01 +0800
Subject: [PATCH] =?UTF-8?q?day09-=E7=BB=A7=E6=89=BF=E4=B8=AD=E6=9E=84?=
 =?UTF-8?q?=E9=80=A0=E6=96=B9=E6=B3=95=E7=9A=84=E8=AE=BF=E9=97=AE=E7=89=B9?=
 =?UTF-8?q?=E7=82=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../inmind/extends_constructor04/Demo05.java    | 17 +++++++++++++++++
 .../com/inmind/extends_constructor04/Fu.java    | 16 ++++++++++++++++
 .../com/inmind/extends_constructor04/Zi.java    |  9 +++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 day09/src/com/inmind/extends_constructor04/Demo05.java
 create mode 100644 day09/src/com/inmind/extends_constructor04/Fu.java
 create mode 100644 day09/src/com/inmind/extends_constructor04/Zi.java

diff --git a/day09/src/com/inmind/extends_constructor04/Demo05.java b/day09/src/com/inmind/extends_constructor04/Demo05.java
new file mode 100644
index 0000000..911ec4e
--- /dev/null
+++ b/day09/src/com/inmind/extends_constructor04/Demo05.java
@@ -0,0 +1,17 @@
+package com.inmind.extends_constructor04;
+/*
+继承中构造方法的访问特点：
+1.创建子类对象时，一定会先调用父类的构造方法
+2.super调用父类的构造方法时，必须在子类构造方法的第一行
+3.super可以调用父类的有参，无参构造方法，但必须在子类构造方法的第一行调用
+
+注意：子类对象在创建时，一定是先创建父类对象空间，用来保存继承到的父类的非私有的内容
+ */
+public class Demo05 {
+    public static void main(String[] args) {
+        System.out.println("main方法开始了");
+        Zi zi = new Zi();
+        System.out.println("程序结束");
+
+    }
+}
diff --git a/day09/src/com/inmind/extends_constructor04/Fu.java b/day09/src/com/inmind/extends_constructor04/Fu.java
new file mode 100644
index 0000000..8a386a7
--- /dev/null
+++ b/day09/src/com/inmind/extends_constructor04/Fu.java
@@ -0,0 +1,16 @@
+package com.inmind.extends_constructor04;
+
+public class Fu {
+    public Fu(){
+        System.out.println("父类的无参构造方法执行了");
+    }
+
+    public Fu(int i) {
+        System.out.println("父类的1个参数构造方法执行了");
+    }
+
+    public Fu(int i,int j) {
+        System.out.println("父类的2个参数构造方法执行了");
+
+    }
+}
diff --git a/day09/src/com/inmind/extends_constructor04/Zi.java b/day09/src/com/inmind/extends_constructor04/Zi.java
new file mode 100644
index 0000000..ad7e67d
--- /dev/null
+++ b/day09/src/com/inmind/extends_constructor04/Zi.java
@@ -0,0 +1,9 @@
+package com.inmind.extends_constructor04;
+
+public class Zi extends Fu{
+    public Zi(){
+        //创建子类对象时，一定是优先创建父类对象，如果子类不写，编译器也会加上
+        //super();//默认加上的代码
+        System.out.println("子类的无参构造方法执行了");
+    }
+}