JAVA基础（TreeMap键是Student值是String案例）

1，TreeMap集合键是Student值是String的案例

 

import java.util.Comparator;

import java.util.TreeMap;





import com.heima.bean.Student;





public class Demo7_TreeMap {





    public static void main(String[] args) {

        //demo1();

        TreeMap tm = new TreeMap<>(new Comparator() {





            @Override

            public int compare(Student s1, Student s2) {

                int num = s1.getName().compareTo(s2.getName());        //按照姓名比较

                return num == 0 ? s1.getAge() - s2.getAge() : num;

            }

        });

        tm.put(new Student("张三", 23), "北京");

        tm.put(new Student("李四", 13), "上海");

        tm.put(new Student("赵六", 43), "深圳");

        tm.put(new Student("王五", 33), "广州");

        

        System.out.println(tm);

    }





    public static void demo1() {

        TreeMap tm = new TreeMap<>();

        tm.put(new Student("张三", 23), "北京");

        tm.put(new Student("李四", 13), "上海");

        tm.put(new Student("王五", 33), "广州");

        tm.put(new Student("赵六", 43), "深圳");

        

        System.out.println(tm);

    }





}