This is a simple program to demonstrate the use of Bitwise Shift operator and learn the basics of Java Programming.
Sometimes we need to change the value of a variable by performing a low-level operation. In a computer system, every number is stored as a binary number made of 1s and 0s. The Bitwise Shift operator can change the value of a stored variable by changing its binary value.
We are using JDK 8u111 with Netbeans IDE 8.2 to compile and run this program.
Problem Definition
This program changes the value of a variable by changing bit values. To perform a bitwise shift we are using two-byte data type variable.
A byte is one of the eight primitive data types in Java. The byte type is 8-bit signed integer data type. It means that it stores integer values -128 to 127, because whenever a signed binary is used then one bit is used as an sign bit. If the signed bit is not used then the integer values are between 0 to 255.
The bit shift operator shifts a certain number of bit to right or left depending on which operator you are using – right bit shift operator (>>) or left bit shift operator (<<).
The program changes the value of variable a by shifting the bit values to left.
Program Code
class Byteshift {
public static void main(String args[])
{
byte a=64,b;
int l;
l = a<<2;
b = (byte)(a << 2);
System.out.println("Original value of a:" + a);
System.out.println("l and b:" + l +" "+ b);
}
}Output – Bitwise Shift Operator
Original value of a: 64
l and b: 256 0The original value a = 64 is 0100 0000 in binary. The bit shift operator move the first 1s to 2 bit left. The new binary value is 0000 0000 which is 0.
Now the l is not limited to 8-bit like a, it is of 32 or 16 bits. The left bit shift by 2 place will be following.
l = 0000 0001 0000 0000 = 2^9 = 256Related Articles:-
- Java Program Demonstrating usage of String-buffer Class and String-builder Class
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- Program to demonstrate Bitwise Shift Operators in Java.
