Java 了解如何将SimpleDataFormat与其他参数一起使用
我试图理解格式化日期并将其添加为对象参数的逻辑,但发现这很困难。我正在尝试使用SimpleDataFormatJava 了解如何将SimpleDataFormat与其他参数一起使用,java,date,datetime,object,instance,Java,Date,Datetime,Object,Instance,我试图理解格式化日期并将其添加为对象参数的逻辑,但发现这很困难。我正在尝试使用SimpleDataFormat myClassroom.addEnrolment(new Classroom("502","424")); myClassroom.addEnrolment(new Classroom("503","425")); myClassroom.addEnrolment(new Classroom("504","426")); 但为了达到这个目标 myClassroom.addEnr
myClassroom.addEnrolment(new Classroom("502","424"));
myClassroom.addEnrolment(new Classroom("503","425"));
myClassroom.addEnrolment(new Classroom("504","426"));
但为了达到这个目标
myClassroom.addEnrolment(new Classroom("502","424", "2020-05-12"));
myClassroom.addEnrolment(new Classroom("503","425", "2020-04-22"));
myClassroom.addEnrolment(new Classroom("504","426", "2020-05-05"));
我两样都进口了
import java.text.SimpleDateFormat;
import java.util.Date;
并在课堂上添加了参数/初始化。我该怎么办?谢谢你的帮助我好像找不到这个信息
编辑教室的属性:
import java.util.Date;
public class Classroom{
private String studID;
private String subjectID;
private Date dateEnroled;
public Classroom(String studID, String subjectID, Date dateEnroled)
{
this.studID = studID;
this.courseID = subjectID;
this.dateEnroled = dateEnroled;
}
您需要一个接受字符串的构造函数,如下所示:
public Classroom(String studID, String subjectID, String dateEnroled)
{
this.studID = studID;
this.courseID = subjectID;
this.dateEnroled = new java.text.SimpleDateFormat("yyyy-MM-dd")
.parse(dateEnroled);
}
正如我在评论中提到的,不要使用过时的
Date
和SimpleDateFormat
。使用和代替。查看更多详细信息
按如下方式操作:
import java.time.LocalDate;
class Classroom {
private String studID;
private String subjectID;
private LocalDate dateEnroled;
public Classroom(String studID, String subjectID, LocalDate dateEnroled) {
this.studID = studID;
this.subjectID = subjectID;
this.dateEnroled = dateEnroled;
}
// Getters, setters, hashCode, equals and toString
}
public class Main {
public static void main(String[] args) {
myClassroom.addEnrolment(new Classroom("502","424", LocalDate.parse("2020-05-12"));
}
}
有关如何将该格式的日期解析为日期对象的信息,请参阅。您试图实现什么?发布更多详细信息,例如
教室的属性列表
,您想做什么等。此外,不要使用过时的SimpleDataFormat
;改为使用DateTimeFormatter
。@ArvindKumarAvinash我已经添加了属性不要使用过期的Date
和SimpleDateFormat
。改用LocalDate
和DateTimeFormatter
。查看更多详细信息。不鼓励使用过时的日期
和简化格式
。您应该使用LocalDat
e和DateTimeFormatter
@ArvindKumarAvinash给出一些示例,实际上最初的问题是关于Date
和SimpleDateFormat
,所以这就是我在回答中使用的。我来这里不是为了让人们第三次或第四次尝试在java中创建合适的日期/时间库;-)