What is the default value of the byte data type in the programming language?

In Java, the byte data type is an 8-bit signed integer type. The default value for a byte variable, if it is a class field and not explicitly initialized, is 0.

Example:

public class Example {
    byte b; // default b == 0

    public static void main(String[] args) {
        Example ex = new Example();
        System.out.println(ex.b); // Will print 0
    }
}

Important: local variables in Java are not initialized by default and require explicit assignment before use.