Java Guava | isPowerOfTwo() method IntMath Class

Last Updated : 23 Jan, 2019

The isPowerOfTwo() method of Guava's IntMath 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(int x)

Parameter: This method accepts a single parameter x which of integer type. Return Value : The method returns true if x represents power of 2 and false if x doesn't represent power of 2. Exceptions : The method doesn't have any exception. Note : This differs from Integer.bitCount(x) == 1, because Integer.bitCount(Integer.MIN_VALUE) == 1, but Integer.MIN_VALUE is not a power of two. Example 1 :

Java

// Java code to show implementation of
// isPowerOfTwo(int x) method of Guava's
// IntMath class
import java.math.RoundingMode;
import com.google.common.math.IntMath;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        int a1 = 63;

        // Using isPowerOfTwo(int x) method
        // of Guava's IntMath class
        if (IntMath.isPowerOfTwo(a1))
            System.out.println(a1 + " is power of 2");
        else
            System.out.println(a1 + " is not power of 2");

        int a2 = 1024;

        // Using isPowerOfTwo(int x) method
        // of Guava's IntMath class
        if (IntMath.isPowerOfTwo(a2))
            System.out.println(a2 + " is power of 2");
        else
            System.out.println(a2 + " is not power of 2");
    }
}

Output :

63 is not power of 2
1024 is power of 2

Example 2 :

Java

// Java code to show implementation of
// isPowerOfTwo(int x) method of Guava's
// IntMath class
import java.math.RoundingMode;
import com.google.common.math.IntMath;

class GFG {

    // Driver code
    public static void main(String args[])
    {
        int a1 = 10;

        // Using isPowerOfTwo(int x) method
        // of Guava's IntMath class
        if (IntMath.isPowerOfTwo(a1))
            System.out.println(a1 + " is power of 2");
        else
            System.out.println(a1 + " is not power of 2");

        int a2 = 256;

        // Using isPowerOfTwo(int x) method
        // of Guava's IntMath class
        if (IntMath.isPowerOfTwo(a2))
            System.out.println(a2 + " is power of 2");
        else
            System.out.println(a2 + " is not power of 2");
    }
}