- Running tasks concurrently on multiple threads
- getApplicationContext (Context)
- onCreateOptionsMenu (Activity)
- addToBackStack (FragmentTransaction)
- FileOutputStream (java.io)
An output stream that writes bytes to a file. If the output file exists, it can
be replaced or appen
- Calendar (java.util)
Calendar is an abstract base class for converting between a Date object and a
set of integer fields
- Dictionary (java.util)
Note: Do not use this class since it is obsolete. Please use the Map interface
for new implementatio
- HashSet (java.util)
HashSet is an implementation of a Set. All optional operations (adding and
removing) are supported.
- Set (java.util)
A Set is a data structure which does not allow duplicate elements.
- ExecutorService (java.util.concurrent)
An Executor that provides methods to manage termination and methods that can
produce a Future for tr
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