- Running tasks concurrently on multiple threads
- getSupportFragmentManager (FragmentActivity)
- setContentView (Activity)
- getExternalFilesDir (Context)
- FileOutputStream (java.io)
An output stream that writes bytes to a file. If the output file exists, it can
be replaced or appen
- KeyStore (java.security)
KeyStore is responsible for maintaining cryptographic keys and their owners.
The type of the syste
- Map (java.util)
A Map is a data structure consisting of a set of keys and values in which each
key is mapped to a si
- Set (java.util)
A Set is a data structure which does not allow duplicate elements.
- Pattern (java.util.regex)
Patterns are compiled regular expressions. In many cases, convenience methods
such as String#matches
- ServletException (javax.servlet)
Defines a general exception a servlet can throw when it encounters difficulty.
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