java - 比较两个字符串作为日期，并检索月份和年份

Question

如果日期匹配，我想打印出结果，具体取决于月份或特定日期。

目前，如果日期完全匹配，我只能让它打印出正确的消息；第一个日期是根据用户输入生成的，所以如果发生变化，我想将它与第二个日期进行比较，看看年份和月份是否仍然相同。如果它们相同，我也想打印出“正确”。

String date1 = "2018-02-04";
String date2 = "2018-02-04";

if(date1.trim().equals(date2.trim())){
System.out.println("Correct");
}




ADDED/UPDATED FOR CLARIFICATION:

while (m.hasNextLine()) 
        {   
                carReg = m.next();
                carModel = m.next();
                carType = m.next();
                vehicleSize = m.next();
                carColour = m.next();
                carMileage = m.next();
                carAccidentHistory = m.next();
                carTransmissionType = x.next();
                carCost = m.next();
                DateArrived = m.next();
                DateSold = m.next();


                m.nextLine();



    if(userDate.trim().equals(DateSold.trim())){            

    System.out.println("Correct output.");
                }


// This if condition works fine, but I'm attempting to match the date the user inputs to any date that is being scanned, provided the year and month match. 

Answer 1

为什么不直接使用 LocalDate这个类:

public static void main(String[] args) {
        String date1 = "2018-02-04";
        String date2 = "2018-02-05";

        LocalDate localDate1 = LocalDate.parse(date1);
        LocalDate localDate2 = LocalDate.parse(date2);

        boolean isSameYear = localDate1.getYear() == localDate2.getYear();
        boolean isSameMonth = localDate1.getMonthValue() == localDate2.getMonthValue();

        if(isSameYear && isSameMonth) {
            System.out.println("correct");
        }

    }

编辑:

感谢@assylias，我们可以将以前的代码简化为:

public static void main(String[] args) {
        String date1 = "2018-02-04";
        String date2 = "2018-02-05";

        LocalDate localDate1 = LocalDate.parse(date1);
        LocalDate localDate2 = LocalDate.parse(date2);

        if(YearMonth.from(localDate1).equals(YearMonth.from(localDate2))) {
            System.out.println("correct");
        }
    }