48 lines
1.2 KiB
Java
48 lines
1.2 KiB
Java
//: concurrency/CallableDemo.java
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// ©2015 MindView LLC: see Copyright.txt
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import java.util.concurrent.*;
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import java.util.*;
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class TaskWithResult implements Callable<String> {
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private int id;
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public TaskWithResult(int id) {
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this.id = id;
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}
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@Override
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public String call() {
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return "result of TaskWithResult " + id;
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}
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}
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public class CallableDemo {
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public static void main(String[] args) {
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ExecutorService exec = Executors.newCachedThreadPool();
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ArrayList<Future<String>> results = new ArrayList<>();
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for(int i = 0; i < 10; i++)
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results.add(exec.submit(new TaskWithResult(i)));
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for(Future<String> fs : results)
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try {
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// get() blocks until completion:
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System.out.println(fs.get());
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} catch(InterruptedException e) {
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System.out.println(e);
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return;
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} catch(ExecutionException e) {
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System.out.println(e);
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} finally {
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exec.shutdown();
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}
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}
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} /* Output:
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result of TaskWithResult 0
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result of TaskWithResult 1
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result of TaskWithResult 2
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result of TaskWithResult 3
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result of TaskWithResult 4
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result of TaskWithResult 5
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result of TaskWithResult 6
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result of TaskWithResult 7
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result of TaskWithResult 8
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result of TaskWithResult 9
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*///:~
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