From 890ad81fada4ad31c321c2532229a4fbb39b0c4f Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 30 May 2026 15:16:52 +0800
Subject: [PATCH] =?UTF-8?q?javaSE-day01-Object=E7=B1=BB=E7=9A=84toString?=
 =?UTF-8?q?=E6=96=B9=E6=B3=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/com/inmind/object01/Demo02.java       | 37 +++++++++++++++++++
 .../src/com/inmind/object01/Person.java       | 10 +++++
 2 files changed, 47 insertions(+)
 create mode 100644 javaSE-day01/src/com/inmind/object01/Demo02.java

diff --git a/javaSE-day01/src/com/inmind/object01/Demo02.java b/javaSE-day01/src/com/inmind/object01/Demo02.java
new file mode 100644
index 0000000..c2785d7
--- /dev/null
+++ b/javaSE-day01/src/com/inmind/object01/Demo02.java
@@ -0,0 +1,37 @@
+package com.inmind.object01;
+
+import java.util.ArrayList;
+
+/*
+Object类的toString方法
+    String toString() 返回对象的字符串表示形式。
+
+Object类的toString的源码：
+public String toString() {
+        return getClass().getName() + "@" + Integer.toHexString(hashCode());
+    }
+
+注意:在实际开发中,一个对象的地址值对于我们而言,没有太大的帮助,我们程序员希望直接看到
+    该对象的内容(属性)，那怎么办呢？？？
+
+现在父类Object类的toString功能,不符合子类Person的需求,那么我们就可以在对应的子类中重写toString
+
+总结:今后打印对象时,如果发现打印时输出了地址,但是我们想看属性内容,应该在该对象的类中重写toString，
+    不用手动写alt+insert自动生成即可
+ */
+public class Demo02 {
+    public static void main(String[] args) {
+        Person p = new Person();
+        p.age = 20;
+        p.name = "张三";
+        System.out.println(p);//com.inmind.object01.Person@3b07d329，此处调用的是Object的toString方法
+
+        ArrayList<Integer> lists = new ArrayList<>();
+        lists.add(1);
+        lists.add(2);
+        lists.add(3);
+        //为何现在打印对象内容变了？？因为println(Object):底层调用的是该对象的toString方法并返回，但是ArrayList重写了父类的toString方法
+        System.out.println(lists);//[1, 2, 3]
+
+    }
+}
diff --git a/javaSE-day01/src/com/inmind/object01/Person.java b/javaSE-day01/src/com/inmind/object01/Person.java
index f8db2f6..cecc82c 100644
--- a/javaSE-day01/src/com/inmind/object01/Person.java
+++ b/javaSE-day01/src/com/inmind/object01/Person.java
@@ -1,4 +1,14 @@
 package com.inmind.object01;
 
 public class Person {//直接继承自Object
+    String name;
+    int age;
+
+    @Override
+    public String toString() {
+        return "Person{" +
+                "age=" + age +
+                ", name='" + name + '\'' +
+                '}';
+    }
 }