Final, Finalize and Wrapper Classes

Back to Java for DSA
Arjit Sharma
01 Min

Final Keyword

Used to restrict the modification of classes, methods, and variables

  • Final Variables: A final variable’s value cannot be changed once it has been assigned. This makes it similar to a constant.
  • Final Methods: A final method cannot be overridden by subclasses. This prevents any further modification of the method’s behavior in derived classes.
  • Final Classes: A final class cannot be subclassed. This means no other class can inherit from a final class.

Finalize

It is a protected and non-static method of Object class. It is invoked by JVM when an object is garbage collected.

With the release of JDK 9 finalize() has been deprecated. 

Wrapper Classes

Class that wraps primitive data types.

Ex - Character, Byte, Integer, Boolean

Autoboxing - Conversion of primitive to object of their corresponding class. int to Integer.

int a = 5;
Integer b = a;
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