yes if the method is ovreriding method

no if the method is not overriding method

Unwrapping is also called as unpacking or unboxing.

Getting the private data stored in the object by using methods is called unpacking or unwrapping.

Wrapping is also called as packing or boxing.

Storing the data inside the object as private data which can accessed outside the class only by using methods.

String class objects are immutable objects and they represents strings( sequence of characters)

StringBuffer class objects are mutable objects representing strings and they are Thread safe

StringBuild class objects are also mutable objects representing strings and they are not Thread safe

Testing an executable application for portability across system platforms and environments, usually for conformation to an ABI specification.

1) List down usecases (taken from business cases) from function specs. For each use case write a test case and categorize them into sanity tests, functionality, GUI, performance etc. Then for each test case, write its workflow. 

2) For a GUI application - make a list of all GUI controls. For each control start writing test cases for testing of the control UI, functionality (impact on the whole application), negative testing (for incorrect inputs), performance etc.  

In GUI testing, need to cover the customer requirement if don't have to validate  Font size, colors, spellings(labels) etc.

Every application should follow Microsoft rules like

- Controls should be Initcap (i.e every label should start with Capital letter )Can observe that in Win applications every label starts with Caps

- OK or Cancel button should exist

- Controls should not be overlapped

- Controls should be alligned properly (left side alignment is mandatory but the right side is optional)

- Controls should be visible

- Short cut keys should be provided

- System menu should exist (i.e if u press Alt key + Space bar a menu will appear at the left most corner )

- Mouse pointer events 

Colors, Label Names, Tab Order, Alignment, graphs , Navigation of the software to test in GUI Testing.

Recovery/error testing is testing how well a system recovers from crashes, hardware failures, or other catastrophic problems.