What Is Byte Data Type Example?


Scott Campbell

The byte data type in Java is used to store whole numbers in the range of -128 to 127. It is a primitive data type that occupies 8 bits (1 byte) of memory. The byte data type is commonly used when memory optimization is a concern, such as when working with large arrays or when dealing with raw binary data.

Declaration and Initialization

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

byte myByte;

You can also initialize a byte variable at the time of declaration:

byte myByte = 42;

Example Usage

Here’s an example that demonstrates the usage of the byte data type:

// Declare and initialize a byte variable
byte age = 25;

// Print the age
System.out.println("Age: " + age);

// Add two bytes and store the result in another byte variable
byte x = 10;
byte y = 20;
byte sum = (byte) (x + y);

// Print the sum
System.println("Sum: " + sum);


The output of the above example will be:

Age: 25
Sum: 30

Limitations and Considerations

It’s important to note that since the byte data type has a limited range, arithmetic calculations involving bytes may result in overflow or underflow. To avoid this, you can cast the result to another data type if necessary.

In addition, when performing arithmetic operations on bytes, they are first promoted to int before the calculation is performed. Therefore, it’s necessary to explicitly cast the result back to a byte if you want to store it in a byte variable.


The byte data type in Java is a compact way to store whole numbers within a limited range. It is particularly useful when working with memory-constrained applications or when dealing with binary data. By understanding its limitations and proper usage, you can leverage the byte data type effectively in your Java programs.

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