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Java 8 – How to check whether a LocalTime is Before another LocalTime ?

August 7, 2022 SJ Java 8, Java 8 Date/Time 0

In this article, we will learn how to check whether one LocalTime is Before another LocalTime using LocalTime.isBefore() method provided in Java 1.8 version

Compare 2 LocalTime using isBefore() method :

  • If there are 2 LocalTime and the requirement is to check whether one LocalTime is before another LocalTime, then isBefore() method of LocalTime can be used
    • isBefore(LocalTime) – checks if invoking LocalTime is before the specified LocalTime
  • Lets see an example for comparing 2 LocalTime using isBefore() method
  • Note: Self comparing LocalTime using isBefore() method always returns false, as shown in the below illustration

CheckLocalTimeIsBeforeAnotherLocalTime.java

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package in.bench.resources.java8.localtime.examples;
 
import java.time.LocalTime;
 
public class CheckLocalTimeIsBeforeAnotherLocalTime {
 
    public static void main(String[] args) {
 
        // 1. get current system time
        LocalTime currentTime = LocalTime.of(17, 29, 59, 999);
        System.out.println("1. Current System Time = " + currentTime);
 
 
        // 2. form past LocalTime
        LocalTime pastTime = LocalTime.MIDNIGHT;
        System.out.println("2. Past LocalTime is = " + pastTime);
 
 
        // 3. form future LocalTime
        LocalTime lastTime = LocalTime.MAX;
        System.out.println("3. Future LocalTime is = " + lastTime);
 
 
        // 4. isBefore() - LocalTime comparison
        System.out.println("\n\n4. Comparing 2 LocalTime using isBefore() method :- \n");
 
 
        // 4.1 check whether currentTime isBefore lastTime
        boolean isBefore1 = currentTime.isBefore(lastTime);
        System.out.println("4.1 Current LocalTime (" + currentTime
                + ") is Before Future LocalTime (" + lastTime + ") ? "
                + isBefore1);
 
 
        // 4.2 check whether currentTime isBefore pastTime
        boolean isBefore2 = currentTime.isBefore(pastTime);
        System.out.println("4.2 Current LocalTime (" + currentTime
                + ") is Before Past LocalTime (" + pastTime + ") ? "
                + isBefore2);
 
 
        // 4.3 check whether pastTime isBefore currentTime
        boolean isBefore3 = pastTime.isBefore(currentTime);
        System.out.println("4.3 Past LocalTime (" + pastTime
                + ") is Before Current LocalTime (" + currentTime + ") ? "
                + isBefore3);
 
 
        // 4.4 check whether pastTime isBefore lastTime
        boolean isBefore4 = pastTime.isBefore(lastTime);
        System.out.println("4.4 Past LocalTime (" + pastTime
                + ") is Before Future LocalTime (" + lastTime + ") ? "
                + isBefore4);
 
 
        // 4.5 check whether lastTime isBefore currentTime
        boolean isBefore5 = lastTime.isBefore(currentTime);
        System.out.println("4.5 Future LocalTime (" + lastTime
                + ") is Before Current LocalTime (" + currentTime + ") ? "
                + isBefore5);
 
 
        // 4.6 check whether lastTime isBefore pastTime
        boolean isBefore6 = lastTime.isBefore(pastTime);
        System.out.println("4.6 Future LocalTime (" + lastTime
                + ") is Before Past LocalTime (" + pastTime + ") ? "
                + isBefore6);
 
 
 
        // 5. isBefore() - self LocalTime comparison
        System.out.println("\n\n5. Self comparing LocalTime using isBefore() method :- \n");
 
 
        // 5.1 check whether currentTime isBefore currentTime
        boolean isBefore7 = currentTime.isBefore(currentTime);
        System.out.println("5.1 Current LocalTime (" + currentTime
                + ") is Before current LocalTime (" + currentTime + ") ? "
                + isBefore7);
 
 
        // 5.2 check whether pastTime isBefore pastTime
        boolean isBefore8 = pastTime.isBefore(pastTime);
        System.out.println("5.2 Past LocalTime (" + pastTime
                + ") is Before Past LocalTime (" + pastTime + ") ? "
                + isBefore8);
 
 
        // 5.3 check whether lastTime isBefore lastTime
        boolean isBefore9 = lastTime.isBefore(lastTime);
        System.out.print("5.3 Future LocalTime (" + lastTime
                + ") is Before Future LocalTime (" + lastTime + ") ? "
                + isBefore9);
    }
}

Output:

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1. Current System Time = 17:29:59.000000999
2. Past LocalTime is = 00:00
3. Future LocalTime is = 23:59:59.999999999
 
 
4. Comparing 2 LocalTime using isBefore() method :-
 
4.1 Current LocalTime (17:29:59.000000999) is Before Future LocalTime (23:59:59.999999999) ? true
4.2 Current LocalTime (17:29:59.000000999) is Before Past LocalTime (00:00) ? false
4.3 Past LocalTime (00:00) is Before Current LocalTime (17:29:59.000000999) ? true
4.4 Past LocalTime (00:00) is Before Future LocalTime (23:59:59.999999999) ? true
4.5 Future LocalTime (23:59:59.999999999) is Before Current LocalTime (17:29:59.000000999) ? false
4.6 Future LocalTime (23:59:59.999999999) is Before Past LocalTime (00:00) ? false
 
 
5. Self comparing LocalTime using isBefore() method :-
 
5.1 Current LocalTime (17:29:59.000000999) is Before current LocalTime (17:29:59.000000999) ? false
5.2 Past LocalTime (00:00) is Before Past LocalTime (00:00) ? false
5.3 Future LocalTime (23:59:59.999999999) is Before Future LocalTime (23:59:59.999999999) ? false

Related Articles:

References:

Happy Coding !!
Happy Learning !!

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