Applying pattern to existent participant do not overwrite methods with the same
name and parameters

steps:
0. create Java Platform UMl project
1. create class diagram
2. add class and name
3. add operation 'public int createMemento()' to the class
4. invoke Apply Design pattern on the class
5. select GoF|Behavioral::Memento, next, any namespace, next
6. select class from step 2 as Originator and press next, next, finish
Dialog about possible overwriting appears
7. press Yes
now initial class have two methods with the same signature except return type