【Java每日一题】20161228

package Dec2016;

import java.util.ArrayList;

import java.util.List;

public class Ques1228 {

    public static void main(String[] arg){

        Student stu01 = new Student("001");

        Student stu02 = new Student("001 ");  // stu02中001后面有个空格

        List<Student> students = new ArrayList<Student>();

        students.add(stu01);

        students.add(stu02);

        System.out.println("students是否包含001学号："+students.contains(stu01));

        System.out.println("students是否包含002学号："+students.contains(stu02));

    }

}

class Student{

    private String stuId;

    public Student(String stuId) {

        super();

        this.stuId = stuId;

    }

    public String getStuId() {

        return stuId;

    }

    public void setStuId(String stuId) {

        this.stuId = stuId;

    }

    @Override

    public boolean equals(Object obj) {

        if(obj instanceof Student){

            Student stu = (Student) obj;

            return stuId.equalsIgnoreCase(stu.getStuId().trim());

        }

        return false;

    }

} 

今日问题： 
请问主程序输出结果是什么？（点击以下“【Java每日一题】20161228”查看20161227问题解析）

题目原发布于公众号、简书：【Java每日一题】20161228，【Java每日一题】20161228