Java BigInteger getLowestSetBit() method

The getLowestSetBit() method of Java BigInteger class is used to get the position of the rightmost set bit of this BigInteger. This method returns an integer whose value is the total number of reset bits (0's) to the right of the rightmost set bit. This method computes (this == 0 ? -1 : log2(this & -this)).

Syntax:

Parameter:

NA.

Returns:

This method returns the index of the rightmost set bit in this BigInteger.

Exception:

Note: This method returns -1 if this BigInteger contains no one bits.

Example 1

import java.math.BigInteger;
public class BigIntegerGetLowestSetBitExample1{
public static void main(String[] args){
// create 3 BigInteger objects
BigInteger big1= new BigInteger("8");   //1000
BigInteger big2= new BigInteger("1");  //0001
BigInteger big3= new BigInteger("10");  //1010
// get the index of lowestsetbit value of BigIntegers
int  index1= big1.getLowestSetBit();  
int  index2= big2.getLowestSetBit();  
int  index3= big3.getLowestSetBit();  
String str1=" Index of the rightmost set bit in  "+big1+" is "+ index1;
String str2=" Index of the rightmost set bit in  "+big2+" is "+ index2;
String str3=" Index of the rightmost set bit in  "+big3+" is "+ index3;
System.out.println(str1);   
System.out.println(str2);   
System.out.println(str3);   
} 
}

Test it Now

Output:

Index of the rightmost set bit in 8 is 3
Index of the rightmost set bit in 1 is 0
Index of the rightmost set bit in 10 is 1

Example 2

import java.math.BigInteger;
public class BigIntegerGetLowestSetBitExample2{
public static void main(String[] args){
// create 2 BigInteger objects
BigInteger big1= new BigInteger("0");  //0000 (no one's )
BigInteger big2= new BigInteger("15");   //1111 (no zero's)
// get the index of lowestsetbit value of BigIntegers
int  index1= big1.getLowestSetBit();  
int  index2= big2.getLowestSetBit();  
String str1=" Index of the rightmost set bit in  "+big1+" is "+ index1;
String str2=" Index of the rightmost set bit in  "+big2+" is "+ index2;
System.out.println(str1);   
System.out.println(str2);   
} 
}

Test it Now

Output:

Index of the rightmost set bit in 0 is -1
Index of the rightmost set bit in 15 is 0

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