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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 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 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");
    }
}

Output :

10 is not power of 2
256 is power of 2

Reference :
https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/IntMath.html#isPowerOfTwo-int-

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