Java Guava | isPowerOfTwo(long x) of LongMath Class with Examples

The method isPowerOfTwo(long x) of Guava’s LongMath Class is used to check if a number is power of two or not. It accepts the number to be checked as a parameter and return boolean value true or false based on whether the number is a power of 2 or not.

Syntax:

public static boolean isPowerOfTwo(long x)

Parameter: This method accepts a single parameter x which is of long type which is to be checked for power of two.

Return Value: This method returns a boolean value. It returns true if x represents power of 2 and false if x doesn’t represent power of 2.

Exceptions: The method doesn’t throw any exception.

Note: This differs from Long.bitCount(x) == 1, because Long.bitCount(Long.MIN_VALUE) == 1, but Long.MIN_VALUE is not a power of two.

Example 1 :

 // Java code to show implementation of // isPowerOfTwo(long x) method of Guava's // LongMath class    import java.math.RoundingMode; import com.google.common.math.LongMath;    class GFG {        // Driver code     public static void main(String args[])     {         long n1 = 52;            // Using isPowerOfTwo(long x) method         // of Guava's LongMath class         if (LongMath.isPowerOfTwo(n1))             System.out.println(n1                                + " is power of 2");         else             System.out.println(n1                                + " is not power of 2");            long n2 = 4;            // Using isPowerOfTwo(long x) method         // of Guava's LongMath class         if (LongMath.isPowerOfTwo(n2))             System.out.println(n2                                + " is power of 2");         else             System.out.println(n2                                + " is not power of 2");     } }

Output:

52 is not power of 2
4 is power of 2

Example 2:

 // Java code to show implementation of // isPowerOfTwo(long x) method of Guava's // LongMath class    import java.math.RoundingMode; import com.google.common.math.LongMath;    class GFG {        // Driver code     public static void main(String args[])     {         long n1 = 256;            // Using isPowerOfTwo(long x) method         // of Guava's LongMath class         if (LongMath.isPowerOfTwo(n1))             System.out.println(n1                                + " is power of 2");         else             System.out.println(n1                                + " is not power of 2");            long n2 = 4096;            // Using isPowerOfTwo(long x) method         // of Guava's LongMath class         if (LongMath.isPowerOfTwo(n2))             System.out.println(n2                                + " is power of 2");         else             System.out.println(n2                                + " is not power of 2");     } }

Output:

256 is power of 2
4096 is power of 2

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