Java中创建对象时如何实现日期？

发布于 2024-12-09 01:36:27 字数 735 浏览 4 评论 0原文

这是一份家庭作业。我必须实现以下内容：

private Date dateCreated 在创建对象时存储。

private Date dateCreated;

dateCreated 的 getter 方法。

public Date getDateCreated() {
    return dateCreated;
}

并且必须实现这个主要方法：

public static void main(String[] args){
    Account a=new Account(1122,20000,4.5);
    a.withdraw(2500);
    a.deposit(3000);
    System.out.println(a.getBalance());
    System.out.println(a.getMonthlyInterestRate()+"%");
    System.out.println(a.getDateCreated()); // or another method what can get 
       //time  when the object created
}

我尝试使用 getTime() 但我不知道如何在我的代码中使用。我看到了一些解决方案，但它总是为此创建另一个类。我想要一个简单的解决方案。（也许在声明 dateCreated 字段时）

原文

It's an homework.
I have to implement the following:

private Date dateCreated which store, when the object was created.

private Date dateCreated;

getter method for dateCreated.

public Date getDateCreated() {
    return dateCreated;
}

And must implement this main method:

public static void main(String[] args){
    Account a=new Account(1122,20000,4.5);
    a.withdraw(2500);
    a.deposit(3000);
    System.out.println(a.getBalance());
    System.out.println(a.getMonthlyInterestRate()+"%");
    System.out.println(a.getDateCreated()); // or another method what can get 
       //time  when the object created
}

I've tried use the getTime() but I don't know how can I use in my code.
I saw some solution, but it always created an another classes for this.
I would like a simple solution. (maybe when declare the dateCreated field)

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谈情不如逗狗 2024-12-16 01:36:27

您可以在 Account 的构造函数中设置 dateCreated 来捕获它的创建时间，如下所示：

public Account(...<params>...)
{
   ... <usual param initialization that you already have>  ...
   this.dateCreated = new Date(); // sets to the current date/time
}

或者，您可以显式设置它（前提是您公开了一个 setter）：

a.setDateCreated(new Date());

然后，您的 getter getDateCreated() 应该为您提供所需的值。

You can set the dateCreated in the constructor of Account, to capture when it was created like this:

public Account(...<params>...)
{
   ... <usual param initialization that you already have>  ...
   this.dateCreated = new Date(); // sets to the current date/time
}

OR, you could explicitly set it (provided you have a setter exposed):