- Making http post requests using okhttp
- setRequestProperty (URLConnection)
- scheduleAtFixedRate (Timer)
- getSystemService (Context)
- SocketException (java.net)
This SocketException may be thrown during socket creation or setting options,
and is the superclass
- Connection (java.sql)
A connection represents a link from a Java application to a database. All SQL
statements and results
- Collections (java.util)
This class consists exclusively of static methods that operate on or return
collections. It contains
- HashSet (java.util)
HashSet is an implementation of a Set. All optional operations (adding and
removing) are supported.
- Handler (java.util.logging)
A Handler object accepts a logging request and exports the desired messages to a
target, for example
- Pattern (java.util.regex)
Patterns are compiled regular expressions. In many cases, convenience methods
such as String#matches
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