- Creating JSON documents from java classes using gson
- findViewById (Activity)
- getApplicationContext (Context)
- startActivity (Activity)
- FileInputStream (java.io)
An input stream that reads bytes from a file.
File file = ...finally
if (in != null)
in.clos
- PrintWriter (java.io)
Wraps either an existing OutputStream or an existing Writerand provides
convenience methods for prin
- Charset (java.nio.charset)
A charset is a named mapping between Unicode characters and byte sequences.
Every Charset can decode
- DecimalFormat (java.text)
A concrete subclass of NumberFormat that formats decimal numbers. It has a
variety of features desig
- Collections (java.util)
This class consists exclusively of static methods that operate on or return
collections. It contains
- Callable (java.util.concurrent)
A task that returns a result and may throw an exception. Implementors define a
single method with no
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