Final

Difference Between final and finalize() in Java

1. final keyword:

It is a keyword used to declare constants, methods, and classes.

Once something is declared as final, it cannot be changed.

For variables: You cannot change the value once initialized.

For methods: You cannot override a final method in subclasses.

For classes: You cannot extend a final class.

Example:

final int number = 10;  // number cannot be changed later

final class MyClass { }  // cannot extend this class

final void show() { }    // cannot override this method

2. finalize() method:

It is a method in the Object class.

Java calls finalize() just before an object is garbage collected.

It is used to clean up resources before the object is destroyed [DB connections closure].

You can override finalize() in your class to perform cleanup (e.g., closing files).

Example: 

protected void finalize() throws Throwable {

    System.out.println("Cleanup before object is garbage collected");

}