- Creating JSON documents from java classes using gson
- orElseThrow (Optional)
Return the contained value, if present, otherwise throw an exception to be
created by the provided s
- addToBackStack (FragmentTransaction)
- getSupportFragmentManager (FragmentActivity)
- 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
- URLConnection (java.net)
A connection to a URL for reading or writing. For HTTP connections, see
HttpURLConnection for docume
- Collection (java.util)
Collection is the root of the collection hierarchy. It defines operations on
data collections and t
- HashMap (java.util)
HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
- CountDownLatch (java.util.concurrent)
A synchronization aid that allows one or more threads to wait until a set of
operations being perfor
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