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Java Duration Class | isNegative() Method with Example

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

Duration Class isNegative() method

• isNegative() method is available in java.time package.
• isNegative() method is used to check whether this Duration object holds the value of length < 0 (i.e. negative) or not but it excludes value 0.
• isNegative() 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.
• isNegative() method does not throw an exception at the time of checking negative value.

Syntax:

    public boolean isNegative();

Parameter(s):

• None

Return value:

The return type of this method is boolean, it returns true when this Duration holds negative value otherwise it returns false.

Example:

// Java program to demonstrate the example 
// of boolean isNegative() method of Duration

import java.time.*;

public class IsNegativeOfDuration {
    public static void main(String args[]) {
        // Instantiates two Duration objects
        Duration du1 = Duration.ofHours(-10);
        Duration du2 = Duration.parse("P1DT2H20M");

        // Display du1 and du2
        System.out.println("du1: " + du1);
        System.out.println("du2: " + du2);


        // checks whether the value
        // of this Duration (du1) is negative
        // or not i.e here it returns true because
        // the value of du1 is negative
        boolean status = du1.isNegative();

        // Display status
        System.out.println("du1.isNegative(): " + status);

        // checks whether the value
        // of this Duration (du2) is negative
        // or not i.e here it returns false because
        // the value of du2 is positive
        status = du2.isNegative();

        // Display status
        System.out.println("du2.isNegative(): " + status);
    }
}

Output

du1: PT-10H
du2: PT26H20M
du1.isNegative(): true
du2.isNegative(): false