Java Reference
In-Depth Information
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// Fig. 23.4: TaskExecutor.java
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// Using an ExecutorService to execute Runnables.
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import
java.util.concurrent.Executors;
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import
java.util.concurrent.ExecutorService;
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public class
TaskExecutor
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{
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public static void main
(String[] args)
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{
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// create and name each runnable
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PrintTask task1 =
new
PrintTask(
"task1"
);
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PrintTask task2 =
new
PrintTask(
"task2"
);
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PrintTask task3 =
new
PrintTask(
"task3"
);
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System.out.println(
"Starting Executor")
;
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// create ExecutorService to manage threads
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ExecutorService executorService = Executors.newCachedThreadPool();
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// start the three PrintTasks
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executorService.execute(task1);
// start task1
executorService.execute(task2);
// start task2
executorService.execute(task3);
// start task3
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// shut down ExecutorService--it decides when to shut down threads
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executorService.shutdown();
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System.out.printf(
"Tasks started, main ends.%n%n"
);
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}
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}
// end class TaskExecutor
Starting Executor
Tasks started, main ends
task1 going to sleep for 4806 milliseconds
task2 going to sleep for 2513 milliseconds
task3 going to sleep for 1132 milliseconds
task3 done sleeping
task2 done sleeping
task1 done sleeping
Starting Executor
task1 going to sleep for 3161 milliseconds.
task3 going to sleep for 532 milliseconds.
task2 going to sleep for 3440 milliseconds.
Tasks started, main ends.
task3 done sleeping
task1 done sleeping
task2 done sleeping
Fig. 23.4
|
Using an
ExecutorService
to execute
Runnable
s.
