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Java Duration Class | plusDays() Method with Example

Duration Class plusDays() method: Here, we are going to learn about the plusDays() method of Duration Class with its syntax and example.
Submitted by Preeti Jain, on May 16, 2020

Duration Class plusDays() method

• plusDays() method is available in java.time package.
• plusDays() method is used to add the given duration in days to this Duration and return the Duration.
• plusDays() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• plusDays() method may throw an exception at the time of performing addition.
  ArithmeticException: This exception may throw when the calculated results exceed the length of this Duration.

Syntax:

    public Duration plusDays(long day_val);

Parameter(s):

• long day_val – represents the day value to add to this Duration.

Return value:

The return type of this method is Duration, it returns the Duration that holds the value added the given days to this Duration.

Example:

// Java program to demonstrate the example 
// of plusDays(long day_val) method of Duration

import java.time.*;

public class PlusDaysOfDuration {
    public static void main(String args[]) {
        long days = 2;

        // Instantiates two Duration objects
        Duration du1 = Duration.ofDays(3);
        Duration du2 = Duration.parse("P2DT20M");

        // Display du1, du2 
        System.out.println("du1: " + du1);
        System.out.println("du2: " + du2);
        System.out.println("days to add: " + days);

        System.out.println();

        // adds the given duration in days with this
        // Duration du1 and returns the Duration 
        // i.e. here we are adding the given 2 days 
        // with this du1 that holds the value of 3 days 
        // i.e.( 72 hrs + 48 hrs = 120 hrs )
        Duration plus_val = du1.plusDays(days);

        // Display plus_val
        System.out.println("du1.plusDays(days): " + plus_val);

        // adds the given duration in days with this 
        // Duration du2 and returns the Duration 
        // i.e. here we are adding the given 2 days 
        // with this du2 that holds the value of 2D:20M 
        // i.e.( 48 hrs + 48 hrs = 96 hrs )
        plus_val = du2.plusDays(days);

        // Display plus_val
        System.out.println("du2.plusDays(days): " + plus_val);
    }
}

Output

du1: PT72H
du2: PT48H20M
days to add: 2

du1.plusDays(days): PT120H
du2.plusDays(days): PT96H20M