【Java每日一题】20161228

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;  
    }   
}