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Java BigInteger Class | shiftLeft() Method with Example

BigInteger Class shiftLeft() method: Here, we are going to learn about the shiftLeft() method of BigInteger Class with its syntax and example.
Submitted by Preeti Jain, on May 11, 2020

BigInteger Class shiftLeft() method

• shiftLeft() method is available in java.math package.
• shiftLeft() method is used to shift the given number of bits towards the left side in this BigInteger.
• shiftLeft() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• shiftLeft() method may throw an exception at the time of shifting bits.
  ArithmeticException: This exception may throw when the given parameter value holds Integer.MIN_VALUE.

Syntax:

    public BigInteger shiftLeft(int number);

Parameter(s):

• int number – represents the value in bits and when it holds negative value it performs right shift instead of left.

Return value:

The return type of this method is BigInteger, it returns BigInteger that holds the value [(this BigInteger) << (number)].

Example:

// Java program to demonstrate the example 
// of BigInteger setBit(int pos) method of BigInteger

import java.math.*;
public class SetBitOfBI {
    public static void main(String args[]) {
        // Initialize a variable str
        String str = "10";

        // Initialize a BigInteger object 
        BigInteger b_int = new BigInteger(str);

        // Display b_int
        System.out.println("b_int: " + b_int);

        // Display Binary representation of  str 
        System.out.println("Binary Representation of 10: 1010 ");

        System.out.println();

        // Here, this method setBit(int) method is used
        // to set the  bit value from "0" to 1" at the
        // given indices in this BigInteger
        // b_int and the binary representation of b_int
        // is 1010 so the bit "1" is set at the given
        // indices (0) so the new binary representation
        // is 1011 i.e. 11
        BigInteger set_bit = b_int.setBit(0);
        System.out.println("b_int.setBit(0): " + set_bit);
        System.out.println("Binary Representation of 11: 1011 ");
    }
}

Output

b_int: 10
Binary Representation of 10: 1010 

b_int.setBit(0): 11
Binary Representation of 11: 1011