Integer.numberOfLeadingZeros() Method in Java With Example Last Updated : 05 Aug, 2025 Comments Improve Suggest changes Like Article Like Report The Integer.numberOfLeadingZeros(int value) method returns the number of zero bits before the first (leftmost) 1-bit in the binary representation of the given integer. If the value is 0 (i.e., no 1-bits), it returns 32.Syntax : public static int numberOfLeadingZeros(int arg)Parameter: This method accepts a single parameter arg, which is the integer value.Return Value: This method returns the number of zero bits preceding the highest-order set-bit in the two's complement binary representation of the specified int value or 32 if the value is equal to zero.Program 1: Below programs illustrate the java.lang.Integer.numberOfLeadingZeros() method. with positive number. java public class LeadingZeros { public static void main(String[] args) { int a = 19; System.out.println("Integral Number = " + a); // Returns the number of zero bits preceding the highest-order one-bit System.out.print("Number of Leading Zeros = "); System.out.println(Integer.numberOfLeadingZeros(a)); } } OutputIntegral Number = 19 Number of Leading Zeros = 27 Explanation: Consider any integer arg, like int arg = 19;Binary Representation(32-bit) of 19 = 00000000 00000000 00000000 00010011First (leftmost) 1 bit is at position 27 (index starts from 0).number of leading zeros = 32 - 5 = 27Program 2: For a negative number. java public class LeadingZeros { public static void main(String[] args) { int a = -15; System.out.println("Number = " + a); // Returns the number of zero bits preceding the highest-order one-bit System.out.print("Number of Leading Zeros = "); System.out.println(Integer.numberOfLeadingZeros(a)); } } OutputNumber = -15 Number of Leading Zeros = 0Program 3: For a decimal value. java public class LeadingZeros { public static void main(String[] args) { // Cast double to int explicitly System.out.print("Number of Leading Zeros = "); System.out.println(Integer.numberOfLeadingZeros((int) 16.32)); } } OutputNumber of Leading Zeros = 27 Note:It returns an error message when a decimal value is passed as an argument. Program 4: For a string value is passed in argument. java public class LeadingZeros { public static void main(String[] args) { // Convert String to int int number = Integer.parseInt("18"); // Returns the number of zero bits preceding the highest-order one-bit System.out.print("Number of Leading Zeros = "); System.out.println(Integer.numberOfLeadingZeros(number)); } } OutputNumber of Leading Zeros = 27 Note:It returns an error message when a string is passed as an argument. Comment More infoAdvertise with us A ankita_chowrasia Follow Improve Article Tags : Java Java-lang package Java-Functions java-math Java-Integer +1 More Practice Tags : Java 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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