java:集合框架(TreeMap集合键是Student值是String的案例)

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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<Student, String> tm=new TreeMap<>(new Comparator<Student>() {

			@Override//内部类实现比较器
			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("李四",24), "上海");
		tm.put(new Student("张三",33), "北京");		
		tm.put(new Student("王五",25), "广州");
		tm.put(new Student("赵六",26), "深圳");
		System.out.println(tm);
	}

	private static void demo1() {
		TreeMap<Student, String> tm=new TreeMap<>();
		tm.put(new Student("张三",23), "北京");
		tm.put(new Student("李四",24), "上海");
		tm.put(new Student("王五",25), "广州");
		tm.put(new Student("赵六",26), "深圳");
		System.out.println(tm);
	}

}