- Running tasks concurrently on multiple threads
- scheduleAtFixedRate (ScheduledExecutorService)
- getExternalFilesDir (Context)
- orElseThrow (Optional)
Return the contained value, if present, otherwise throw an exception to be
created by the provided s
- Selector (java.nio.channels)
A controller for the selection of SelectableChannel objects. Selectable channels
can be registered w
- UUID (java.util)
UUID is an immutable representation of a 128-bit universally unique identifier
(UUID). There are mul
- AtomicInteger (java.util.concurrent.atomic)
An int value that may be updated atomically. See the java.util.concurrent.atomic
package specificati
- Manifest (java.util.jar)
The Manifest class is used to obtain attribute information for a JarFile and its
entries.
- ServletException (javax.servlet)
Defines a general exception a servlet can throw when it encounters difficulty.
- Logger (org.apache.log4j)
This is the central class in the log4j package. Most logging operations, except
configuration, are d
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