【Java每日一题】20161229

时间:2024-01-16 16:44:38
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<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)

题目原发布于公众号、简书:【Java每日一题】20161229【Java每日一题】20161229