invokeAny() implementation

ExecutorServiceExample.java

package com.wordpress.compilationerrors;
import java.lang.Runnable;
import java.lang.*;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.*;

public class ExecutorServiceExample {

    public static void main(String[] args) throws InterruptedException, ExecutionException {
        ExecutorService executorService = Executors.newSingleThreadExecutor();
        Set<Callable<String>> callables = new HashSet<Callable<String>>();
        callables.add(new Callable<String>() {
            public String call() throws Exception {
                return "Task 1";
            }
        });
        callables.add(new Callable<String>() {
            public String call() throws Exception {
                return "Task 2";
            }
        });
        callables.add(new Callable<String>() {
            public String call() throws Exception {
                return "Task 3";
            }
        });

        String result = executorService.invokeAny(callables);

        System.out.println("result = " + result);

        executorService.shutdown();
    }
}