Few questions over the past few weeks

StringBuilder Vs StringBuffer

StringBuffer is synchronized, StringBuilder is not.

Both are mutable

The object created through StringBuffer & StringBuilder are stored in the heap .

StringBuffer is slow but thread safe . Due to this it does not allow two threads to simultaneously access the same method . Each method can be accessed by one thread at a time .

StringBuilder is fast as it is not thread safe.

Adding variable watch

While you're in the debugger go Window -> Debugger -> Variables

You will have <Enter new watch> written there. Type the variable you want to watch there and you can track it from there.