Java Guava | isPowerOfTwo(long x) of LongMath Class with Examples
Last Updated :
28 Jan, 2019
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 :
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
public static void main(String args[])
{
long n1 = 52 ;
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 ;
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:
import java.math.RoundingMode;
import com.google.common.math.LongMath;
class GFG {
public static void main(String args[])
{
long n1 = 256 ;
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 ;
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
Reference: https://google.github.io/guava/releases/20.0/api/docs/com/google/common/math/LongMath.html#isPowerOfTwo-long-
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