What Is Byte Data Type in Java Example?


Heather Bennett

The Byte data type in Java is used to store whole numbers from -128 to 127. It is an 8-bit signed two’s complement integer. The default value of a byte variable is 0.

Declaring a Byte Variable

To declare a byte variable, you can use the following syntax:

byte variableName;

For example, let’s declare a byte variable named myByte:

byte myByte;

Initializing a Byte Variable

You can assign a value to a byte variable at the time of declaration or later in your code. Here’s an example of initializing a byte variable:

byte myByte = 10;

In this example, the value 10 is assigned to the myByte variable.

Working with Byte Data Type

The byte data type can be used for various purposes, such as:

#1 Arithmetic Operations

You can perform arithmetic operations on byte variables just like any other numeric data type. Here’s an example:

// Addition
byte sum = myByte + 5;
System.out.println("Sum: " + sum);

// Subtraction
byte difference = myByte - 3;
System.println("Difference: " + difference);

// Multiplication
byte product = myByte * 2;
System.println("Product: " + product);

// Division
byte quotient = myByte / 3;
System.println("Quotient: " + quotient);

// Modulus (remainder)
byte remainder = myByte % 3;
System.println("Remainder: " + remainder);

#2 Array of Bytes

You can create an array of bytes to store multiple byte values. Here’s an example:

byte[] byteArray = {1, 2, 3, 4, 5};
System.println("Array Length: " + byteArray.length);

In this example, an array named byteArray is declared and initialized with five byte values.

#3 Type Casting

You can also perform type casting to convert a byte value to another data type. Here’s an example:

byte myByte = 100;
int myInt = myByte; // Implicit casting from byte to int

System.println("Byte Value: " + myByte);
System.println("Int Value: " + myInt);

In this example, the value of the myByte variable is implicitly casted to an integer (myInt) during assignment.


The byte data type in Java is a useful tool for storing small whole numbers within a limited range. It is commonly used in scenarios where memory conservation is a priority or when dealing with raw binary data.

To summarize:

  • The byte data type stores whole numbers from -128 to 127.
  • You can declare and initialize byte variables using the appropriate syntax.
  • The byte data type supports arithmetic operations and can be used in arrays.
  • Type casting allows you to convert a byte value to another data type if needed.

By understanding the byte data type and its capabilities, you can effectively utilize it in your Java programs.

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