- Running tasks concurrently on multiple threads
- startActivity (Activity)
- addToBackStack (FragmentTransaction)
- findViewById (Activity)
- URL (java.net)
A Uniform Resource Locator that identifies the location of an Internet resource
as specified by RFC
- KeyStore (java.security)
KeyStore is responsible for maintaining cryptographic keys and their owners.
The type of the syste
- Calendar (java.util)
Calendar is an abstract base class for converting between a Date object and a
set of integer fields
- HashMap (java.util)
HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
- Vector (java.util)
Vector is an implementation of List, backed by an array and synchronized. All
optional operations in
- Option (scala)
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