Java – How to Check if the Double value is not a number ?

Problem Statement

You need to find out if the given double value is not a number in Java.

Solution

Use the method isNaN() defined in the Double class to find out if the given number is not a number in Java.

public class Main {

    public static void main(String[] args) {

        System.out.println("Abundantcode.com Java Tutorials");

        Double input1 = new Double(0/0.);
        System.out.println(input1.isNaN());
        
    }
}

The output of the above program is

Abundantcode.com Java Tutorials

true