- Creating JSON documents from java classes using gson
- addToBackStack (FragmentTransaction)
- requestLocationUpdates (LocationManager)
- scheduleAtFixedRate (ScheduledExecutorService)
- PrintWriter (java.io)
Wraps either an existing OutputStream or an existing Writerand provides
convenience methods for prin
- 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
- List (java.util)
An ordered collection (also known as a sequence). The user of this interface has
precise control ove
- Collectors (java.util.stream)
- ImageIO (javax.imageio)
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