Java multi-threads programming

I am a beginner of Java programming learner. I can't know how to correct the following Java program. Kindly help to let me know how to correct it. Thanks a lot.

public class TMA1Q2 {

public static void main(String[] args) {
    System.out.println("Usage: java TMA1Q2 {number of Threads}");

    // Create tasks
    Runnable taskA = new PrintTwoConcurThreads("Thread A ");
    Runnable taskB = new PrintTwoConcurThreads("            Thread B ");

    // Create threads
    Thread thread1 = new Thread(taskA);
    Thread thread2 = new Thread(taskB);

    // Start threads
    thread1.start();
    thread2.start();
}

}

// The task that implements Runnable

class PrintTwoConcurThreads implements Runnable {

private final String TwoConcurThreads;
private String[] args;

public PrintTwoConcurThreads(String numThreads) {
    TwoConcurThreads = numThreads;
}

// Override the run() method
@Override
public void run() {
    // Print the value input argument times
    int numThreads = Integer.parseInt(args[0]);
    Thread[] myThread;
    myThread = new Thread[numThreads];
    for (int i = 0; i < numThreads; i++) {
        System.out.println(TwoConcurThreads + i);
    }
}
}