java - 产品有效期(意外输出)

问候！我已经处理了预期可以处理该程序的以下代码。如果用户手动指定的到期日期在当前日期之前，则程序应终止，否则程序将显示剩余多少时间。

当我输入有效日期作为当前日期时，即年份：2014，月份：3，日期：7
符合我的期望，该程序应该已经终止，但显示为1年，等等。我在哪里做错。

// Sets GregorianCalendar expiryDate object
static void setTrial(){
    System.out.println("\n----- SET TRIAL DATE ----\n");

    System.out.print("Year : ");
    int year = new Scanner(System.in).nextInt();

    System.out.print("Month : ");
    int month = new Scanner(System.in).nextInt();

    System.out.print("Day : ");
    int day = new Scanner(System.in).nextInt();

    expiryDate = new GregorianCalendar(year, month, day);
}

// Validates the expiryDate with current GregorianCalendar object
static void validate(){
    System.out.print("\n----- VALIDATING THE PRODUCT ----\n");
    GregorianCalendar current = new GregorianCalendar();

    if( current.after(expiryDate) ){
        System.out.println("\nYour trial period is expired. Please buy the product.");
    }else{
        GregorianCalendar temp = new GregorianCalendar(expiryDate.get(GregorianCalendar.YEAR) -
                        current.get(GregorianCalendar.YEAR),
                        expiryDate.get(GregorianCalendar.MONTH) -
                        current.get(GregorianCalendar.MONTH),
                        expiryDate.get(GregorianCalendar.DAY_OF_MONTH) -
                        current.get(GregorianCalendar.DAY_OF_MONTH));
        System.out.println("\nYou still have " +
                        temp.get(GregorianCalendar.YEAR) + " years, " +
                        temp.get(GregorianCalendar.MONTH) + " months, " +
                        temp.get(GregorianCalendar.DAY_OF_MONTH) +
                        " days remaining... \n\nPlease buy the product before it expires!");
    }

最佳答案

改变以下

expiryDate = new GregorianCalendar(year, month, day);

至

GregorianCalendar expiryDate = new GregorianCalendar(year, month-1, day);

和

System.out.println("\nYou still have " + temp.get(GregorianCalendar.YEAR) + " years, " + temp.get(GregorianCalendar.MONTH) + " months, " + temp.get(GregorianCalendar.DAY_OF_MONTH) + " days remaining... \n\nPlease buy the product before it expires!");

至

System.out.println("\nYou still have " + temp.get(GregorianCalendar.YEAR-1) + " years, " + temp.get(GregorianCalendar.MONTH) + " months, " + temp.get(GregorianCalendar.DAY_OF_MONTH) + " days remaining... \n\nPlease buy the product before it expires!");

关于java - 产品有效期(意外输出)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/22252514/