- Finding current android device location
- addToBackStack (FragmentTransaction)
- getSystemService (Context)
- getSharedPreferences (Context)
- Calendar (java.util)
Calendar is an abstract base class for converting between a Date object and a
set of integer fields
- Enumeration (java.util)
A legacy iteration interface.New code should use Iterator instead. Iterator
replaces the enumeration
- 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
- Collectors (java.util.stream)
- DataSource (javax.sql)
An interface for the creation of Connection objects which represent a connection
to a database. This
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