Java每日一题20161229

20161228问题解析请点击今日问题下方的“【Java每日一题】20161229”查看（问题解析在公众号首发，公众号ID：weknow619）

package Dec2016;

import java.util.ArrayList;
import java.util.List;

public class Ques1229 {

    public static void main(String[] args) {
        
        Student stu01 = new Student("001");
        Student stu02 = new Student(null);
        
        List students = new ArrayList();
        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null："+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】20161229”查看20161228问题解析）