J2SE-日期比较

最新推荐文章于 2021-02-15 11:42:10 发布

原创最新推荐文章于 2021-02-15 11:42:10 发布 · 317 阅读

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方法一：Date.before()，Date.after()，Date.equals()

public static void main(String[] args) throws ParseException {
		
	    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
	    Date date1 = sdf.parse("2009-12-31");
	    Date date2 = sdf.parse("2010-01-31");

	    System.out.println(sdf.format(date1));
	    System.out.println(sdf.format(date2));

	    if (date1.compareTo(date2) > 0) {
	        System.out.println("Date1 is after Date2");
	    } else if (date1.compareTo(date2) < 0) {
	        System.out.println("Date1 is before Date2");
	    } else if (date1.compareTo(date2) == 0) {
	        System.out.println("Date1 is equal to Date2");
	    } else {
	        System.out.println("How to get here?");
	    }
}

方法二：Date.compareTo

public static void main(String[] args) throws ParseException {
		
	    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
	    Date date1 = sdf.parse("2009-12-31");
	    Date date2 = sdf.parse("2010-01-31");

	    System.out.println(sdf.format(date1));
	    System.out.println(sdf.format(date2));

	    if (date1.after(date2)) {
	        System.out.println("Date1 is after Date2");
	    }

	    if (date1.before(date2)) {
	        System.out.println("Date1 is before Date2");
	    }

	    if (date1.equals(date2)) {
	        System.out.println("Date1 is equal Date2");
	    }
}

方法三：Calender.before()，Calender.after()，Calender.equals()

public static void main(String[] args) throws ParseException {
		
	    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
	    Date date1 = sdf.parse("2009-12-31");
	    Date date2 = sdf.parse("2010-01-31");

	    System.out.println(sdf.format(date1));
	    System.out.println(sdf.format(date2));

	    Calendar cal1 = Calendar.getInstance();
	    Calendar cal2 = Calendar.getInstance();
	    cal1.setTime(date1);
	    cal2.setTime(date2);

	    if(cal1.after(cal2)){
	        System.out.println("Date1 is after Date2");
	    }

	    if(cal1.before(cal2)){
	        System.out.println("Date1 is before Date2");
	    }

	    if(cal1.equals(cal2)){
	        System.out.println("Date1 is equal Date2");
	    }

}