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Java Integer class numberOfLeadingZeros() method with example

Integer class numberOfLeadingZeros() method: Here, we are going to learn about the numberOfLeadingZeros() method of Integer class with its syntax and example.
Submitted by Preeti Jain, on October 02, 2019

Integer class numberOfLeadingZeros() method

  • numberOfLeadingZeros() method is available in java.lang package.
  • numberOfLeadingZeros() method is used to returns the number of 0's bits preceding the leftmost one bit in the 2's complement of the given parameter [value] of integer type. Otherwise, it returns 32 if the given parameter value is 0.
  • numberOfLeadingZeros() method is a static method, it is accessible with the class name too and if we try to access the method with the class object then also we will not get an error.
  • numberOfLeadingZeros() method does not throw an exception.

Syntax:

    public static int numberOfLeadingZeros (int value);

Parameter(s):

  • int value – represents the integer value to be parsed.

Return value:

The return type of this method is int, if the given argument is non-zero then, it returns the number of 0's bits preceding the leftmost one bit of the given int value. Else, if the given argument is zero then, it returns the value 32.

Example:

// Java program to demonstrate the example 
// of numberOfLeadingZeros (int value) method of Integer class

public class NumberOfLeadingZerosOfIntegerClass {
    public static void main(String[] args) {
        int value1 = 1296;
        int value2 = 0;

        // It returns the string representation of the given unsigned 
        // integer value denoted by the argument in binary by calling
        // Integer.toBinaryString(value1)
        System.out.println("Integer.toBinaryString(value1): " + Integer.toBinaryString(value1));

        // It returns the string representation of the given unsigned 
        // integer value denoted by the argument in binary by calling
        // Integer.toBinaryString(value2)
        System.out.println("Integer.toBinaryString(value2): " + Integer.toBinaryString(value2));


        // It returns the number of 0's bits preceding the leftmost side 
        // one bit in the given argument 'value' by calling 
        // Integer.numberOfLeadingZeros(value1)
        System.out.println("Integer.numberOfLeadingZeros(value1): " + Integer.numberOfLeadingZeros(value1));

        // It returns the value 32 because the value of 
        // the given argument is zero 
        System.out.println("Integer.numberOfLeadingZeros(value2): " + Integer.numberOfLeadingZeros(value2));
    }
}

Output

Integer.toBinaryString(value1): 10100010000
Integer.toBinaryString(value2): 0
Integer.numberOfLeadingZeros(value1): 21
Integer.numberOfLeadingZeros(value2): 32





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