JAVA 深入理解 TreeSet

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TreeSet集合石用来对象元素进行排序的，同样也具有保持元素唯一性的特征（通过实现Comparable接口）。

import java.io.Serializable;

public class Student  implements Serializable, Comparable {
    private  String name;
    private  int age;

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

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

    @Override
    public int compareTo(Object o) {
        if(!(o instanceof Student)){
            throw  new ClassCastException("object to cast student error !");
        }
        return  this.age - ((Student)o).age;
    }

}

import java.util.TreeSet;

public class Main {

    public  static  void main(String []args){
        TreeSet<Student> hs = new TreeSet<Student>();
        for(int i = 0; i< 10; i++){
            hs.add(new Student("AA"+i, 10));
        }

        System.out.println(hs);
    }
}