What is the difference between using the final keyword and the finally block in programming languages?

In Java, the keyword final and the block finally serve completely different functions:

• final is a modifier used for:
  • Variables: their value cannot be changed after initialization.
  • Methods: the method cannot be overridden in a subclass.
  • Classes: the class cannot be inherited.

Example:

final int x = 10;
// x = 5; // Compilation error

final class MyClass {}
// class SubClass extends MyClass {} // Error

• finally is a block in a try-catch construct that always executes, regardless of whether an exception was thrown or not. It is usually used for resource cleanup.

Example:

try {
    // code
} catch(Exception e) {
    // exception handling
} finally {
    // code that will always execute
}