Immutable objects are highly desirable . Because an immutable object's state cannot be changed, they are particularly useful in concurrent environments . Immutable options can simplify code and ...

The implementation technique outlined above is much like the one used by String and StringBuffer companion classes in the standard Java implementation, except that the mutable StringBuffer is not ...

Java doesn't work like this, java.lang.String and java.lang.StringBuffer aren't related through inheritance and when you call StringBuffer.toString () a brand new String is created with a copy of ...