immutable objects and lazy initialization.

Question

http://www.javapractices.com/topic/TopicAction.do?Id=29

Above is the article which i am looking at. Immutable objects greatly simplify your program, since they:

Answer 1

And to add to other answers.

Immutable object cannot be changed. The final keyword works for basic data types such as int. But for custom objects it doesn't mean that - it has to be done internally in your implementation:

The following code would result in a compilation error, because you are trying to change a final reference/pointer to an object.

final MyClass m = new MyClass();
m = new MyClass();

However this code would work.

final MyClass m = new MyClass();
m.changeX();