[Java基础]比较器排序Comparator的使用

Posted 2021-06-23 Wecccccccc

代码如下:

package ComparablePack;


public class Student {
    private String name;
    private int age;

    public Student() {
    }

    public Student(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;
    }

}

package ComparablePack;

import java.util.Comparator;
import java.util.TreeSet;

public class TreeSetDemo01 {
    public static void main(String[] args)
    {
        TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                int num = s1.getAge()-s2.getAge();
                int num2 = num==0?s1.getName().compareTo(s2.getName()):num;
                return num2;
            }
        });



        Student s1 = new Student("Tom",13);
        Student s2 = new Student("Jack",17);
        Student s3 = new Student("Lily",29);
        Student s4 = new Student("Jbck",17);
        Student s5 = new Student("Jack",17);

        ts.add(s1);
        ts.add(s2);
        ts.add(s3);
        ts.add(s4);
        ts.add(s5);

        for (Student s:ts)
        {
            System.out.println(s.getName()+","+s.getAge());
        }


    }

}