- You can declare an entire class final — this prevents the class from being sub classed.
- Final class prevents inheritance.
- Trying to extend a class that is marked as final will result in compiler error.
- Accordingly, many of the Java standard library classes are final, for example java.lang.System and java.lang.String.
- All methods in a final class are implicitly final.
- Use final class for safety, when nobody should change your method implementation.
- Final class can never be improved or specialized by another programmer.
//FINAL CLASS
final class Animal
{
/*
1. All methods in a final class are implicitly final.
*/
}
//Error - Cannot subclass the final class
class Cat extends Animal { }
Compiler Error: The type Cat cannot subclass the final class Animal
