Java - Double isNaN() method

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Description

The Java 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 1

The following example shows the usage of Double isNaN() method to check if a Double object carries a NaN value. We've initialized a Double object with an expression which result in positive infinity. Then using isNaN() method, we're checking its value.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {
      Double d = new Double(1.0/0.0);
   
      // returns true if NaN
      System.out.println(d + " = " + d.isNaN());
   }
} 

Output

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

Infinity = false

Example 2

The following example shows the usage of Double isNaN() method to check if a Double object carries a NaN value. We've initialized a Double object with an expression which result in negative infinity. Then using isNaN() method, we're checking its value.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {
      Double d = new Double(-1.0/0.0);
   
      // returns true if NaN
      System.out.println(d + " = " + d.isNaN());
   }
} 

Output

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

-Infinity = false

Example 3

The following example shows the usage of Double isNaN() method to check if a Double object carries a NaN value. We've initialized a Double object with an expression which result in NAN. Then using isNaN() method, we're checking its value.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {
      Double d = new Double(0.0/0.0);
   
      // returns true if NaN
      System.out.println(d + " = " + d.isNaN());
   }
} 

Output

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

NaN = true

Example 4

The following example shows the usage of Double isNaN() method to check if a Double object carries a NaN value. We've initialized a Double object with an expression which result in zero value. Then using isNaN() method, we're checking its value.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {
      Double d = new Double(0.0/1.0);
   
      // returns true if NaN
      System.out.println(d + " = " + d.isNaN());
   }
} 

Output

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

0.0 = false