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mLine 3:
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→Executor service
===With apt===
===With apt===
<nowiki>sudo apt-add-repository ppa:webupd8team/java
<nowiki>sudo apt-add-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer</nowiki>
Also ensure your JAVA_HOME variable has been set to:
Also ensure your JAVA_HOME variable has been set to:
Static fields aren't serialized too.
Static fields aren't serialized too.
== Threading ==
==Threading==
<syntaxhighlight lang="java">
<syntaxhighlight lang="java">
class Task1 extends Thread {
class Task1 extends Thread {
</syntaxhighlight>
</syntaxhighlight>
=== Executor service ===
===Executor service===
<syntaxhighlight lang="java">
<syntaxhighlight lang="java">
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ExecutorService;
executorService.execute(new Task(4));
executorService.execute(new Task(4));
executorService.shutdown()
executorService.shutdown()
}
}
</syntaxhighlight>
=== Return values from threads ===
<syntaxhighlight lang="java">
import java.util.concurrent.Callable;
class CallableTask implements Callable<String> {
public CallableTask(String name){
this.name = name;
}
@Override
public String call() throws Exception {
Thread.sleep(1000);
return "Hello " + name;
}
}
public class CallableRunner throws InterruptedException, Exec... {
public static void main(String[] args){
ExecutorService executorService = Executors.newFixedThreadPoool(1);
Future<String> welcomeFuture = executorService.submit(new CallableTask("Manolo"));
System.out.print("\ncallable executed")
String welcomeMessage = welcomeFuture.get();
System.out.print("\nMain completed")
}
}
}
}