- Running tasks concurrently on multiple threads
- setContentView (Activity)
- addToBackStack (FragmentTransaction)
- startActivity (Activity)
- File (java.io)
An "abstract" representation of a file system entity identified by a pathname.
The pathname may be a
- Connection (java.sql)
A connection represents a link from a Java application to a database. All SQL
statements and results
- HashMap (java.util)
HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
- LinkedList (java.util)
Doubly-linked list implementation of the List and Dequeinterfaces. Implements
all optional list oper
- Random (java.util)
This class provides methods that return pseudo-random values.It is dangerous to
seed Random with the
- Base64 (org.apache.commons.codec.binary)
Provides Base64 encoding and decoding as defined by RFC 2045.This class
implements section 6.8. Base
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