java - Java 8中Date对象的after函数的问题

我在date对象中的after（）函数有问题。
这是我要运行的功能：

    private void setDebitDateInAction(Action action) {

    // The day the credit card debit is made
    int dD = action.getMethodPayment().getDebitDate();
    System.out.println("1) The debit day is every "+dD+" in  month.");

    //The date the purchase was made
    Date actionDate = action.getActionDate();
    System.out.println( "2) The purchase was in "+ actionDate.toString() );

    //The date the purchase will be charged
    Date debitDate = actionDate;
    System.out.println("3) Currently the debit date is "+debitDate.toString()  );

    //0 means immediate charge
    if(dD == 0) {
        //Leave the billing date as the purchase date.
    }else {
        // Change the day of the billing date
        debitDate.setDate(dD);
        System.out.println("4) The day of the debit date has changed to "+dD+" and new the debit date is " +debitDate.toString()  );
        if(actionDate.after(debitDate)) {
            debitDate.setMonth(debitDate.getMonth()+1);
            System.out.println("5) The month of the debit date has changed to "+debitDate.getMonth() + 1 +" and new the debit date is " +debitDate.toString()  );
        }
    }
    action.setDebitDate(debitDate);
    System.out.println("6) ActionDebit is set to" +debitDate.toString()  );
}

这是在我将ActionDate为15/07/2019且methodPayment的dateDate（出于信用目的）的dateDate为10的Action函数放入控制台后得到的结果。

1) The debit day is every 10 in  month.
2) The purchase was in Mon Jul 15 03:00:00 IDT 2019
3) Currently the debit date is Mon Jul 15 03:00:00 IDT 2019
4) The day of the debit date has changed to 10 and now the debit date is Wed Jul 10 03:00:00 IDT 2019
6) ActionDebit is set toWed Jul 10 03:00:00 IDT 2019

我希望结算日期为10/08/2019，但不会成功。
由于某种原因，他无法识别购买日期是在开票日期之后。

最佳答案

因此，有两种（以下）方案：


CompareTo（）-如果您使用正确的`debitDate：


这是因为您的actionDate和debitDate相同，因此在两个日期相等的情况下if(actionDate.after(debitDate))将始终返回false。

您应该使用compareTo()代替。

代码应如下所示：

if(actionDate.compareTo(debitDate) >=0) {
debitDate.setMonth(debitDate.getMonth()+1);
            System.out.println("5) The month of the debit date has changed to "+debitDate.getMonth() + 1 +" and new the debit date is " +debitDate.
}

您使用了错误的debitDate：
您应该设置正确的debitDate，代码应如下所示：

//购买日期

日期debitDate = action.getMethodPayment（）。getDebitDate（）;


希望这能解决您的问题！