Java TreeSet 添加自定义对象 必须指定排序规则

Java TreeSet 添加自定义对象 必须指定排序规则

package com.zhong.collection.set;import java.util.Comparator;
import java.util.TreeSet;public class TreeSetDemo {public static void main(String[] args) {// TreeSet 添加自定义数据类型 应该自定义排序规则TreeSet<Stu> stus = new TreeSet<>((Comparator.comparingInt(Stu::getAge)));
//        TreeSet<Stu> stus = new TreeSet<>(((o1, o2) -> o1.getAge()- o2.getAge()));stus.add(new Stu("小钟", 22));stus.add(new Stu("小钟", 22));stus.add(new Stu("小王", 21));stus.add(new Stu("张三", 60));stus.add(new Stu("张三", 80));for (Stu student : stus) {System.out.println(student);}}
}
class Stu {private String name;private int age;public Stu() {}public Stu(String name, int age) {this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Student{" +"name='" + name + '\'' +", age=" + age +'}';}
}