Java.util.concurrent.Executor interface with Examples
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Java.util.concurrent.Executor interface with Examples
- Last Updated : 17 Jun, 2019
The concurrent API in Java provides a feature known as an executor that initiates and controls the execution of threads. As such, an executor offers an alternative to managing threads using the thread class. At the core of an executor is the Executor interface. It refers to the objects that execute submitted Runnable tasks.
Class heirarchy:
java.util.concurrent ↳ Interface Executor
Implementing Sub-Interfaces:
ExecutorService ScheduledExecutorService
Implementing Classes:
AbstractExecutorService ForkJoinPool ScheduledThreadPoolExecutor ThreadPoolExecutor
Methods in Executor interface:
- execute(): This function executes the given command at some time in the future. The command may execute in a new thread, in a pooled thread, or in the calling thread, at the discretion of the Executor implementation.
Syntax:
void execute(Runnable task)
Example to demonstrate an Executor.
import
java.util.concurrent.Executor;
import
java.util.concurrent.RejectedExecutionException;
public
class
ExecutorDemo {
public
static
void
main(String[] args)
{
ExecutorImp obj =
new
ExecutorImp();
try
{
obj.execute(
new
NewThread());
}
catch
(RejectedExecutionException
| NullPointerException exception) {
System.out.println(exception);
}
}
}
class
ExecutorImp
implements
Executor {
@Override
public
void
execute(Runnable command)
{
new
Thread(command).start();
}
}
class
NewThread
implements
Runnable {
@Override
public
void
run()
{
System.out.println(
"Thread executed under an executor"
);
}
}
Thread executed under an executor
Reference:https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/Executor.html
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