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Instant isAfter() method in Java with Examples

  • Last Updated : 27 Nov, 2018
Geek Week

isAfter() method of an Instant class is used to check if this instant is after the instant passed as parameter or not. This method returns a boolean value showing the same.

Syntax:

public boolean isAfter(Instant otherInstant)

Parameter: This method takes a parameter otherInstant which is the other instant to compare to this instant. It should not be null.

Returns: This method returns true if this instant is after the specified instant. Else it returns false.

Exception: This method throws NullPointerException if otherInstant passed as the parameter is null.



Below programs illustrate the isAfter() method:

Program 1:




// Java program to demonstrate
// Instant.isAfter() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a Instant object
        Instant instant1
            = Instant.parse("2018-12-30T19:34:50.63Z");
  
        // create other Instant
        Instant instant2
            = Instant.parse("2018-12-29T09:24:00.63Z");
  
        // print instances
        System.out.println("Instance 1: " + instant1);
        System.out.println("Instance 2: " + instant2);
  
        // check if instant1 is after instant2
        // using isAfter()
        boolean value = instant1.isAfter(instant2);
  
        // print result
        System.out.println("Is Instant1 after Instant2: "
                           + value);
    }
}
Output:
Instance 1: 2018-12-30T19:34:50.630Z
Instance 2: 2018-12-29T09:24:00.630Z
Is Instant1 after Instant2: true

Program 2:




// Java program to demonstrate
// Instant.isAfter() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a Instant object
        Instant instant1
            = Instant.parse("2018-10-30T19:34:50.63Z");
  
        // create other Instant
        Instant instant2 = Instant.now();
  
        // print instances
        System.out.println("Instance 1: " + instant1);
        System.out.println("Instance 2: " + instant2);
  
        // check if instant1 is after instant2
        // using isAfter()
        boolean value = instant1.isAfter(instant2);
  
        // print result
        System.out.println("Is Instant1 after Instant2: "
                           + value);
    }
}
Output:
Instance 1: 2018-10-30T19:34:50.630Z
Instance 2: 2018-11-27T04:52:08.970Z
Is Instant1 after Instant2: false

Program 3: To show Exception thrown by isAfter()




// Java program to demonstrate
// Instant.isAfter() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create a Instant object
        Instant instant1
            = Instant.parse("2018-10-30T19:34:50.63Z");
  
        // create other Instant
        Instant instant2 = null;
  
        try {
  
            // print instances
            System.out.println("Instance 1: " + instant1);
            System.out.println("Instance 2: " + instant2);
  
            // check if instant1 is after instant2
            // using isAfter()
            boolean value = instant1.isAfter(instant2);
        }
        catch (Exception e) {
            // print result
            System.out.println("Exception: " + e);
        }
    }
}
Output:
Instance 1: 2018-10-30T19:34:50.630Z
Instance 2: null
Exception: java.lang.NullPointerException

References: https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html#isAfter(java.time.Instant)

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