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Integer lowestOneBit() Method in Java

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  • Last Updated : 13 Dec, 2021
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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 a 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

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