因簡書改版后無法添加擴展鏈接，20170217問題解析請到公眾號查看，問題解析在公眾號首發，公眾號ID：weknow619。
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;
}
}
今日問題：
請問主程序輸出結果是什么？
