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Integer lowestOneBit() Method in Java

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The Integer.lowestOneBit() method of java.lang is an inbuilt function that returns an int value with at most a single one-bit, in the position of the lowest-order (ie.rightmost) one-bit in the specified int value. This method will return zero if the specified value has no one-bits in its two’s complement binary representation, ie. if the binary representation of the number is equal to zero.
Syntax: 

public static int lowestOneBit(int a)

Parameters: The method takes one parameter of integer type that refers to the value whose lowest order bit is to be returned or on which the operation is to be performed.
Returns : The method can return two types of values:

  • Returns an integer value with a single 1-bit, in the position of the lowest-order one-bit in the specified value
  • Returns zero if the specified value is equal to zero.

Examples: 

Input: 157
Output: Lowest one bit = 1

Input: 0
Output: Lowest one bit = 0

Explanation:
Consider any integer a = 10
Binary Representation = 0000 1010
Lowest bit(at 1) i.e.0000 0010
so result = 2^1=2

Below programs illustrate the java.lang.Integer.lowestOneBit() method:
Program 1: For a positive number. 

java




// Java program to illustrate the
// java.lang.Integer.lowestOneBit() method
import java.lang.*;
 
public class Geeks {
 
    public static void main(String[] args)
    {
 
        int a = 157;
        System.out.println("Given Number = " + a);
 
        // Returns an int value with at most a single one-bit
        System.out.print("Lowest one bit = ");
        System.out.println(Integer.lowestOneBit(a));
 
        a = 64;
        System.out.println("Given Number = " + a);
 
        System.out.print("Lowest one bit = ");
        System.out.println(Integer.lowestOneBit(a));
 
        // Here it will return 0 since the number is itself zero
        a = 0;
        System.out.println("Given Number = " + a);
 
        System.out.print("Lowest one bit = ");
        System.out.println(Integer.lowestOneBit(a));
    }
}


Output: 

Given Number = 157
Lowest one bit = 1
Given Number = 64
Lowest one bit = 64
Given Number = 0
Lowest one bit = 0

 

Program 2: For a negative number. 

java




// Java program to illustrate the
// java.lang.Integer.lowestOneBit() method
import java.lang.*;
 
public class Geeks {
 
    public static void main(String[] args)
    {
 
        int a = -157;
        System.out.println("Given Number = " + a);
 
        // It will return an int value with at most a single one-bit
        System.out.print("Lowest one bit = ");
        System.out.println(Integer.lowestOneBit(a));
        a = -17;
        System.out.println("Given Number = " + a);
 
        System.out.print("Lowest one bit = ");
        System.out.println(Integer.lowestOneBit(a));
    }
}


Output: 

Given Number = -157
Lowest one bit = 1
Given Number = -17
Lowest one bit = 1

 

Program 3: For a decimal value and String. 
Note:It returns a compile time error message when a decimal value and a string is passed as an argument. 

java




// Java program to illustrate the
// java.lang.Integer.lowestOneBit() method
import java.lang.*;
 
public class Geeks {
 
    public static void main(String[] args)
    {
 
        // Decimal value is given
        int a = 71.57;
        System.out.println("Given Number = " + a);
 
        System.out.print("Lowest one bit = ");
        System.out.println(Integer.lowestOneBit(a));
 
        // String is passed
        a = "12";
        System.out.println("Given Number = " + a);
 
        System.out.print("Lowest one bit = ");
        System.out.println(Integer.lowestOneBit(a));
    }
}


Output: 

prog.java:10: error: incompatible types: possible lossy conversion from double to int
    int a = 71.57;
            ^
prog.java:17: error: incompatible types: String cannot be converted to int
    a = "12";
        ^
2 errors


Last Updated : 02 Jan, 2023
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