From be6aed66ba39b45559b29251eda5d7b087c42a11 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Wed, 14 Oct 2026 14:43:26 +0800
Subject: [PATCH] =?UTF-8?q?s-day03--HashSet=E5=AD=98=E5=82=A8=E8=87=AA?=
 =?UTF-8?q?=E5=AE=9A=E4=B9=89=E5=AF=B9=E8=B1=A1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 s-day03/src/com/inmind/set02/HashDemo07.java  |  8 +++---
 .../src/com/inmind/set02/HashSetDemo08.java   | 27 +++++++++++++++++++
 s-day03/src/com/inmind/set02/Student.java     |  8 ++++++
 3 files changed, 39 insertions(+), 4 deletions(-)
 create mode 100644 s-day03/src/com/inmind/set02/HashSetDemo08.java

diff --git a/s-day03/src/com/inmind/set02/HashDemo07.java b/s-day03/src/com/inmind/set02/HashDemo07.java
index 90819bc..2b31c05 100644
--- a/s-day03/src/com/inmind/set02/HashDemo07.java
+++ b/s-day03/src/com/inmind/set02/HashDemo07.java
@@ -33,10 +33,10 @@ public class HashDemo07 {
         String s4 = "重地";
         String s5 = "abc";
         String s6 = new String("abc");
-        System.out.println(s3.hashCode());
-        System.out.println(s4.hashCode());
-        System.out.println(s5.hashCode());
-        System.out.println(s6.hashCode());
+        System.out.println(s3.hashCode());//1179395
+        System.out.println(s4.hashCode());//1179395
+        System.out.println(s5.hashCode());//96354
+        System.out.println(s6.hashCode());//96354
 
         HashSet<String> sets = new HashSet<>();
         sets.add(s6);
diff --git a/s-day03/src/com/inmind/set02/HashSetDemo08.java b/s-day03/src/com/inmind/set02/HashSetDemo08.java
new file mode 100644
index 0000000..e08044c
--- /dev/null
+++ b/s-day03/src/com/inmind/set02/HashSetDemo08.java
@@ -0,0 +1,27 @@
+package com.inmind.set02;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/*
+HashSet存储自定义对象
+注意：我们保存数据时，先判断哈希值，如果不一样直接存，如果哈希值相同，还要使用equals方法判断内容
+是否相同，如果相同，就不存，不同则保存，所以必须重写hashCode和equals
+ */
+public class HashSetDemo08 {
+    public static void main(String[] args) {
+        Student s1 = new Student("刘备1", 20);
+        Student s2 = new Student("刘备2", 19);
+        Student s3 = new Student("刘备3", 21);
+        Student s4 = new Student("刘备3", 21);
+        Student s5 = new Student("刘备3", 21);
+        HashSet<Student> sets = new HashSet<>();
+        sets.add(s3);
+        sets.add(s2);
+        sets.add(s1);
+        sets.add(s4);
+        sets.add(s5);
+        System.out.println(sets);
+
+    }
+}
diff --git a/s-day03/src/com/inmind/set02/Student.java b/s-day03/src/com/inmind/set02/Student.java
index a67dc29..c5d40e7 100644
--- a/s-day03/src/com/inmind/set02/Student.java
+++ b/s-day03/src/com/inmind/set02/Student.java
@@ -11,6 +11,14 @@ public class Student {
         this.age = age;
     }
 
+    @Override
+    public String toString() {
+        return "Student{" +
+                "name='" + name + '\'' +
+                ", age=" + age +
+                '}';
+    }
+
     @Override
     public boolean equals(Object o) {
         if (o == null || getClass() != o.getClass()) return false;