Multi thread and Concurrency - Simple MultiExecutor

 Very simple code block of MultiExecutor class

package thread.example;

import java.util.ArrayList;
import java.util.List;

/**
 * <p>The client of this class will create a list of <code>Runnable</code> tasks and

 provide that list into <code>MultiExecutor</code>'s constructor.</p>
 * <p>When the client runs the&nbsp; <code>executeAll()</code>,&nbsp; 

the <code>MultiExecutor</code>,&nbsp; will execute all the given tasks.</p>
 * <p>To take full advantage of our multicore CPU, we would like the 

<code>MultiExecutor</code> to execute all the tasks in parallel, 

by passing each task to a different thread.</p>
 */
public class MultiExecutor {

    // Add any necessary member variables here
    private final List<Runnable> tasks;

    /*
     * @param tasks to executed concurrently
     */
    public MultiExecutor(List<Runnable> tasks) {
        // Complete your code here
        this.tasks = tasks;
    }

    /**
     * Starts and executes all the tasks concurrently
     */
    public void executeAll() {
        // complete your code here
        // create list of threads
        List<Thread> threads = new ArrayList<>(tasks.size());
        // for each task create a thread and add to thread list.
        for (Runnable task : tasks) {
            Thread thread = new Thread(task);
            threads.add(thread);
        }

        // start each thread
        for (Thread thread : threads) {
            thread.start();
        }
    }
}