Java.lang.Double.isNan() Method

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Description

The java.lang.Double.isNan() method returns true if this Double value is a Not-a-Number (NaN), false otherwise.

Declaration

Following is the declaration for java.lang.Double.isNan() method

public boolean isNaN()

Parameters

NA

Return Value

This method returns true if the value represented by this object is NaN; false otherwise.

Exception

NA

Example

The following example shows the usage of java.lang.Double.isNan() method.

package com.tutorialspoint;

import java.lang.*;

public class DoubleDemo {

   public static void main(String[] args) {

      Double d1 = new Double(-1.0/0.0);
      Double d2 = new Double(0.0/0.0);
  
      // returns true if this Double value is a Not-a-Number (NaN) 
      System.out.println(d1 + " = " + d1.isNaN());
  
      // returns false for other cases
      System.out.println(d2 + " = " + d2.isNaN());
   }
}  

Let us compile and run the above program, this will produce the following result −

-Infinity = false
NaN = true