如何在Java中比较两个日期和时间？
该java.time.LocalDateTime 类表示本地日期和时间，即无时区的日期，你可以使用这个对象，而不是日期。这个类提供了各种方法，例如isBefore()，isAfter()和，isEqual()来比较两个日期-
示例
import java.time.LocalDateTime;
public class Test {
public static void main(String args[]) {
LocalDateTime dateTime1 = LocalDateTime.of(2007, 11, 25, 10, 15, 45);
LocalDateTime dateTime2 = LocalDateTime.of(1999, 9, 12, 07, 25, 55);
Boolean bool1 = dateTime1.isAfter(dateTime2);
Boolean bool2 = dateTime1.isBefore(dateTime2);
Boolean bool3 = dateTime1.isEqual(dateTime2);
if(bool1){
System.out.println(dateTime1+" 是在之后 "+dateTime2);
}else if(bool2){
System.out.println(dateTime1+" 是之前 "+dateTime2);
}else if(bool3){
System.out.println(dateTime1+" 等于 "+dateTime2);
}
}
}输出结果2007-11-25T10:15:45 是在之后 1999-09-12T07:25:55
示例
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class CreateDateTime {
public static void main(String args[]) throws ParseException {
String dateTimeStr1 = "26-09-1989 8:27:45";
String dateTimeStr2 = "12-11-2010 2:30:12";
//实例化SimpleDateFormat类
SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:SS");
Date dateTime1 = formatter.parse(dateTimeStr1);
Date dateTime2 = formatter.parse(dateTimeStr2);
Boolean bool1 = dateTime1.after(dateTime2);
Boolean bool2 = dateTime1.before(dateTime2);
Boolean bool3 = dateTime1.equals(dateTime2);
if(bool1){
System.out.println(dateTimeStr1+" 是在之后 "+dateTimeStr2);
}else if(bool2){
System.out.println(dateTimeStr1+" 是之前 "+dateTimeStr2);
}else if(bool3){
System.out.println(dateTimeStr1+" 等于 "+dateTimeStr2);
}
}
}输出结果26-09-1989 8:27:45 是之前 12-11-2010 2:30:12