TreeMap指定排序示例

package map;

import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;

/**
 * @auto dh
 * @create 2020-04-30-21:05
 */
class User {
    private String name;
    private int age;

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", 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;
    }

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

public class TreeMap002 {
    public static void main(String[] args) {
//treeMap的指定排序
        Map<User,Integer> treeMap=new TreeMap<>(new Comparator<User>() {
            @Override
            public int compare(User o1, User o2) {
                return o1.getName().compareTo(o2.getName())==0?Integer.compare(o1.getAge(),o2.getAge()):o1.getName().compareTo(o2.getName());
            }
        });
        treeMap.put(new User("zhangsan",20),1);
        treeMap.put(new User("zhangsan",12),2);
        treeMap.put(new User("lisi",20),3);
        System.out.println(treeMap);

    }
}