java - IF 语句条件

Question

这是我的代码，我有一个简单的问题

import java.util.*;
import java.io.*;
import type.lib.GlobalCredit;
import type.lib.CreditCard;
import java.text.SimpleDateFormat;


public class eCheck08A

{
public static void main(String[] args)

{
    PrintStream out = System.out;
    Scanner in = new Scanner(System.in);

    GlobalCredit credit1 = new GlobalCredit().getRandom();

    out.print("Enter report range in years ... ");
    int range = in.nextInt();
    out.println("Cards expiring before " + range + " year(s) from now: ");

    SimpleDateFormat sf = new SimpleDateFormat("dd/MM/yyyy");

    for (CreditCard cc : credit1)
    {

    Calendar c = Calendar.getInstance();
    c.setTime(cc.getExpiryDate());
    c.add(Calendar.YEAR, range);
    Date newDate = c.getTime();

        if (cc.getExpiryDate().compareTo(newDate) < range)
        {
            if(cc.getExpiryDate().compareTo(newDate) > range)
            {
                out.print("*");
            }
            out.print(cc.getNumber());
            out.println("\t" + sf.format(cc.getExpiryDate()));

        }
    }



}
}

它应该是什么样子的输出:

Enter report range in years ... 3
Cards expiring before 3 years from now:

561561-8 20/11/2015
045645-7 22/02/2017
456462-3 16/04/2013 *
546548-5 19/08/2016

当前年份是 2012 年此人输入“3”作为范围。所以 2012-2015 年的任何一年都应该有一个“*”。与上面的输出一样，2013 年有一个“*”。你能告诉我在我的 IF 语句中做错了什么吗？

Answer 1

如果您将 cc.getExpiryDate() 与当前日期 + 范围 进行比较，您希望 newDate 为:

Calendar c = Calendar.getInstance();
// commenting this line out because getInstance() gives us the current date already
//    c.setTime(cc.getExpiryDate());
c.add(Calendar.YEAR, range);
Date newDate = c.getTime();

此 newDate 比当前日期提前“范围”年。现在您可以开始比较您的 cc.getExpiryDate() 值:

    // expiry date is BEFORE the date + "range" years ahead
    if (cc.getExpiryDate().compareTo(newDate) < 0)
    {
        // the expiry date is AFTER or ON the current date
        if(cc.getExpiryDate().compareTo(new Date()) >= 0)
        {
            out.print("*");
        }
    }
    out.print(cc.getNumber());
    out.println("\t" + sf.format(cc.getExpiryDate()));