TreeMap集合之传入比较器
package com.day15.Map;
import java.util.Comparator;
import java.util.TreeMap;
import com.day15.bean.Student;
public class TreeMapOne {
public static void main(String[] args) {
TreeMap<Student, String> tm=new TreeMap<>(new Comparator<Student>() {
@Override
public int compare(Student s1, Student s2) {
int num=s1.getName().compareTo(s2.getName());
return num==0 ? s1.getAge()-s2.getAge() :num;
}
});
tm.put(new Student("Kobe",20), "LA");
tm.put(new Student("KG",21), "Boston");
tm.put(new Student("PP",22), "Boston");
tm.put(new Student("Allen",23), "Nanjing");
System.out.println(tm);//{Student [name=Allen,age=23]=Nanjing, Student [name=KG,age=21]=Boston, Student [name=Kobe,age=20]=LA, Student [name=PP,age=22]=Boston}
}
}