---

---

Description

The Java Float isNaN(float v) method returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.The argument v is the value to be tested.

Declaration

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

public static boolean isNaN(float v)

Parameters

v − This is the value to be tested.

Return Value

This method returns true if the value of the argument is NaN; false otherwise.

Exception

NA

Checking If a float value Carries a NAN Value Example

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

package com.tutorialspoint;

public class FloatDemo {
   public static void main(String[] args) {
      float f = (float) (1.0/0.0);
   
      // returns true if NaN
      System.out.println(f + " = " + Float.isNaN(f));
   }
} 

Output

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

Infinity = false

Checking If a float value Carries a NAN Value Example

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

package com.tutorialspoint;

public class FloatDemo {
   public static void main(String[] args) {
      float f = (float) (-1.0/0.0);
   
      // returns true if NaN
      System.out.println(f + " = " + Float.isNaN(f));
   }
} 

Output

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

-Infinity = false

Checking If a float value Carries a NAN Value Example

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

package com.tutorialspoint;

public class FloatDemo {
   public static void main(String[] args) {
      float f = (float) (0.0/0.0);
   
      // returns true if NaN
      System.out.println(f + " = " + Float.isNaN(f));
   }
}

Output

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

NaN = true

Checking If a float value Carries a NAN Value Example

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

package com.tutorialspoint;

public class FloatDemo {
   public static void main(String[] args) {
      Float f = new Float(0.0/1.0);
   
      // returns true if NaN
      System.out.println(f + " = " + Float.isNaN(f));
   }
} 

Output

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

0.0 = false

java_lang_float.htm