【Java每日一题】20161228

20161227问题解析请点击今日问题下方的“【Java每日一题】20161228”查看

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：[url=http://mp.weixin.qq.com/s?__biz=MzI4ODEyMTgwMA==&mid=2650163320&idx=1&sn=52ebe0d7dd11989e1feb3159c9bfe54c&chksm=f3c1dedfc4b657c9a881ee79ecf674043108154990bc6b69b576aa4adf7cdf6a301a6096a2bf#rd]【Java每日一题】20161228[/url]，[url=http://www.jianshu.com/p/41837ef769f2]【Java每日一题】20161228[/url]

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