【Java每日一题】20170220

20170217问题解析请点击今日问题下方的“【Java每日一题】20170220”查看

 

package Feb2017;  
  
import java.util.ArrayList;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
  
public class Ques0220 {      
    public static void main(String[] args) {  
        List<Student> list = new ArrayList<Student>();  
        list.add(new Student("001"));  
  
        Map<Student, Object> map = new HashMap<Student, Object>();  
        map.put(new Student("001"), new Object());  
  
        System.out.println("list是否包含001："+list.contains(new Student("001")));  
        System.out.println("map是否包含001："+map.containsKey(new Student("001")));  
    }  
}  
      
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;              
            if(stu.getStuId() == null || stuId == null){                  
                return false;  
            }else{                  
                return stuId.equalsIgnoreCase(stu.getStuId());  
            }  
        }          
        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】20170220”查看20170217问题解析） 

题目原发布于公众号、简书：【Java每日一题】20170220，【Java每日一题】20170220 （也可以扫描头像二维码查看）