Java Guava | floorPowerOfTwo() method IntMath Class Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The floorPowerOfTwo() method of Guava's IntMath class accepts a parameter and returns the largest power of two less than the value passed in the parameter. This is equivalent to: checkedPow(2, log2(x, FLOOR)). Syntax : public static int floorPowerOfTwo(int x) Parameters: This method accepts a single parameter x which is an integral value. Return Value : The method returns the largest power of two less than or equal to x. Exceptions : The method floorPowerOfTwo(int x) throws IllegalArgumentException if x <= 0. Example 1 : Java // Java code to show implementation // of floorPowerOfTwo(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 n1 = 10; // Using floorPowerOfTwo(int x) method // of Guava's IntMath class int ans1 = IntMath.floorPowerOfTwo(n1); System.out.println("Largest power of 2 less " + "than or equal to " + n1 + " is : " + ans1); int n2 = 127; // Using floorPowerOfTwo(int x) method // of Guava's IntMath class int ans2 = IntMath.floorPowerOfTwo(n2); System.out.println("Largest power of 2 less " + "than or equal to " + n2 + " is : " + ans2); } } Output : Largest power of 2 less than or equal to 10 is : 8 Largest power of 2 less than or equal to 127 is : 64 Example 2 : Java // Java code to show implementation // of floorPowerOfTwo(int x) method // of Guava's IntMath class import java.math.RoundingMode; import com.google.common.math.IntMath; class GFG { static int findFloorPow(int x) { try { // Using floorPowerOfTwo(int x) // method of Guava's IntMath class // This should raise "IllegalArgumentException" // as x <= 0 int ans = IntMath.floorPowerOfTwo(x); // Return the answer return ans; } catch (Exception e) { System.out.println(e); return -1; } } // Driver code public static void main(String args[]) { int x = -3; try { // Function calling findFloorPow(x); } catch (Exception e) { System.out.println(e); } } } Output : java.lang.IllegalArgumentException: x (-3) must be > 0 Reference : https://guava.dev/releases/20.0/api/docs/com/google/common/math/IntMath.html#floorPowerOfTwo-int- Comment More infoAdvertise with us Next Article Introduction to Java B bansal_rtk_ Follow Improve Article Tags : Misc Java Java-Functions java-guava Practice Tags : JavaMisc Similar Reads Java Tutorial Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. 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