2021-10-22

                                 TreeSetComparable两个比较

package gh;

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

public class xiaoYu {
    public static void main(String[] args) {
        TreeSet xi=new TreeSet<>();
        xi.add(new xiaoFeiyuzi("xiaoyan",15));
        xi.add(new xiaoFeiyuzi("xiao",102));
        xi.add(new xiaoFeiyuzi("yan",100));
        xi.add(new xiaoFeiyuzi("xiaoan",10));
        for(xiaoFeiyuzi  xiao:xi){
            System.out.println(xiao);
        }
    }
}
class xiaoFeiyuzi implements  Comparable {
    String name;
    int age;
    public xiaoFeiyuzi() {
    }
    public xiaoFeiyuzi(String name, int age) {
        this.name = name;
        this.age = age;
    }
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof xiaoFeiyuzi)) return false;
        xiaoFeiyuzi that = (xiaoFeiyuzi) o;
        if (age != that.age) return false;
        return name != null ? name.equals(that.name) : that.name == null;
    }

    @Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + age;
        return result;
    }

    @Override
    public String toString() {
        return "消费鱼子{" +
                "name='" + name + ''' +
                ", age=" + age +
                '}';
    }
    @Override
    public int compareTo(xiaoFeiyuzi o) {
       if(this.age==o.age){
           return this.name.compareTo(o.name);
       }else{
           return  this.age-o.age;
       }
    }
打印结果： 

费鱼子{name='xiaoan', age=10}
消费鱼子{name='xiaoyan', age=15}
消费鱼子{name='yan', age=100}
消费鱼子{name='xiao', age=102}