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Java
import java.util.TreeSet;

public class demo11 {
    public static void main(String[] args) {
        TreeSet ts = new TreeSet();
        ts.add(3);
        ts.add(1);
        ts.add(1);
        ts.add(2);
        ts.add(3);
        System.out.println(ts);
    }
}

Java
import java.util.TreeSet;

class Student implements Comparable<Student> {
    private String id;
    private String name;

    public Student(String id, String name) {
        this.id = id;
        this.name = name;
    }

    // 重寫toString()方法
    @Override
    public String toString() {
        return id + ":" + name;
    }

    @Override
    public int compareTo(Student o) {
        // return 0; // 集合中只有一個(gè)元素
        // return 1; // 集合按照怎么存就怎么取
        return -1; // 集合按照存入順序倒過來進(jìn)行存儲(chǔ)
    }
}

public class Example12 {
    public static void main(String[] args) {
        TreeSet ts = new TreeSet();
        ts.add(new Student("1", "張三"));
        ts.add(new Student("2", "李四"));
        ts.add(new Student("3", "王五"));
        System.out.println(ts);
    }
}

Java
package com.cy.demo13;
import java.util.Comparator;
import java.util.TreeSet;

class Student {
    private String id;
    private String name;

    public Student(String id, String name) {
        this.id = id;
        this.name = name;
    }

    // 重寫toString()方法
    @Override
    public String toString() {
        return id + ":" + name;
    }
}
public class Example13 {
    public static void main(String[] args) {
        TreeSet ts = new TreeSet(new Comparator() {
            @Override
            public int compare(Object o1. Object o2) {
                return -1;
            }
        });
        ts.add(new Student("1", "張三"));
        ts.add(new Student("2", "李四"));
        ts.add(new Student("3", "王五"));
        System.out.println(ts);
    }
}