Java: Simple multithreading a piece of code

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import java.util.*; import java.util.concurrent.*;   // ...   ExecutorService exec = Executors.newFixedThreadPool(2 * Runtime.getRuntime().availableProcessors()); try {     for (int i = 0; i < num_of_runs; i++) {         exec.submit(new Runnable() {             @Override             public void run() {                 // do stuff in num_of_runs times through a 2*#CPU threadpool             }         });     } } finally {     exec.shutdown(); }