Java - Float isNaN() method

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Description

The Java Float isNaN() method returns true if this Float value is a Not-a-Number (NaN), false otherwise.

Declaration

Following is the declaration for java.lang.Float.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 Float isNaN() method to check if a Float object carries a NaN value. We've initialized a Float object 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 = new Float(1.0/0.0);
   
      // returns true if NaN
      System.out.println(f + " = " + f.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 Float isNaN() method to check if a Float object carries a NaN value. We've initialized a Float object 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 = new Float(-1.0/0.0);
   
      // returns true if NaN
      System.out.println(f + " = " + f.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 Float isNaN() method to check if a Float object carries a NaN value. We've initialized a Float object 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 = new Float(0.0/0.0);
   
      // returns true if NaN
      System.out.println(f + " = " + f.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 Float isNaN() method to check if a Float object carries a NaN value. We've initialized a Float object 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 + " = " + f.isNaN());
   }
} 

Output

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

0.0 = false