【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） weknow团队已开通认证了分答，有问题也可以来咨询，点击分答就可以找到我了！！