From 143e8e0f59bd580d8ea5287ca040e87000b0e3dc Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Mon, 3 Aug 2026 11:21:20 +0800
Subject: [PATCH] =?UTF-8?q?s-day04-TreeSet=E4=BF=9D=E5=AD=98=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-day04/src/com/inmind/treeset02/Student.java | 41 +++++++++++++++++++
 .../com/inmind/treeset02/TreeSetDemo09.java   | 31 ++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 s-day04/src/com/inmind/treeset02/Student.java
 create mode 100644 s-day04/src/com/inmind/treeset02/TreeSetDemo09.java

diff --git a/s-day04/src/com/inmind/treeset02/Student.java b/s-day04/src/com/inmind/treeset02/Student.java
new file mode 100644
index 0000000..4be5024
--- /dev/null
+++ b/s-day04/src/com/inmind/treeset02/Student.java
@@ -0,0 +1,41 @@
+package com.inmind.treeset02;
+
+import java.util.Objects;
+
+public class Student implements Comparable<Student>{
+    String name;
+    int age;
+
+    public Student(String name, int age) {
+        this.name = name;
+        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;
+
+        Student student = (Student) o;
+        return age == student.age && Objects.equals(name, student.name);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = Objects.hashCode(name);
+        result = 31 * result + age;
+        return result;
+    }
+
+    @Override
+    public int compareTo(Student o) {
+        return this.age - o.age;
+    }
+}
diff --git a/s-day04/src/com/inmind/treeset02/TreeSetDemo09.java b/s-day04/src/com/inmind/treeset02/TreeSetDemo09.java
new file mode 100644
index 0000000..6dda25a
--- /dev/null
+++ b/s-day04/src/com/inmind/treeset02/TreeSetDemo09.java
@@ -0,0 +1,31 @@
+package com.inmind.treeset02;
+
+import java.util.Comparator;
+import java.util.TreeSet;
+
+/*
+TreeSet保存自定义对象
+注意：TreeSet会使用元素的自带的自然排序功能Comparable接口
+ */
+public class TreeSetDemo09 {
+    public static void main(String[] args) {
+        //创建一个对学生对象有排序功能的集合
+        TreeSet<Student> treeSet = new TreeSet<>();
+        treeSet.add(new Student("小王1", 18));
+        treeSet.add(new Student("小王2", 17));
+        treeSet.add(new Student("小王3", 20));
+        System.out.println(treeSet);
+        System.out.println("--------------如果自定义对象没有自然排序或者不符合我们的需求，使用比较器------------------");
+        TreeSet<Student> sets = new TreeSet<>(new Comparator<Student>() {
+            @Override
+            public int compare(Student o1, Student o2) {
+                return o2.age - o1.age;
+            }
+        });
+
+        sets.add(new Student("小王1", 18));
+        sets.add(new Student("小王2", 17));
+        sets.add(new Student("小王3", 20));
+        System.out.println(sets);
+    }
+}