java中Date日期类型的大小比较
转:
方法一:
java.util.Date类实现了Comparable接口,可以直接调用Date的compareTo()方法来比较大小
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String beginTime = "2018-07-28 14:42:32";
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String endTime = "2018-07-29 12:26:32";
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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try {
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Date date1 = format.parse(beginTime);
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Date date2 = format.parse(endTime);
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int compareTo = date1.compareTo(date2);
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System.out.println(compareTo);
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} catch (ParseException e) {
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e.printStackTrace();
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}
compareTo()方法的返回值,date1小于date2返回-1,date1大于date2返回1,相等返回0
方法二:
通过Date自带的before()或者after()方法比较
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String beginTime = "2018-07-28 14:42:32";
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String endTime = "2018-07-29 12:26:32";
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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try {
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Date date1 = format.parse(beginTime);
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Date date2 = format.parse(endTime);
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boolean before = date1.before(date2);
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System.out.println(before);
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} catch (ParseException e) {
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e.printStackTrace();
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}
before()或者after()方法的返回值为boolean类型
方法三:
通过调用Date的getTime()方法获取到毫秒数来进行比较
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String beginTime = "2018-07-28 14:42:32";
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String endTime = "2018-07-29 12:26:32";
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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try {
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Date date1 = format.parse(beginTime);
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Date date2 = format.parse(endTime);
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long beginMillisecond = date1.getTime();
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long endMillisecond = date2.getTime();
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System.out.println(beginMillisecond > endMillisecond);
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} catch (ParseException e) {
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e.printStackTrace();
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}