Java concurrency - Is this efficient?

Java concurrency - Is this efficient?



public class Client extends SelectCarOption {

public static void main(String args[]) {

Thread thread1 = new SelectCarOption();

thread1.run();

if (runType == 2) {

try {

thread1.sleep(5000); //stops thread1 to run different thread

} catch (InterruptedException e1) {

e1.printStackTrace();

}

Thread thread2 = new CarModelOptionsIO();

thread2.run();

try {

thread2.join();

} catch (InterruptedException e) {

e.printStackTrace();

}

} else {

try {

thread1.join();

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

So basically, I'm trying to run a program where the thread that is running

is determined by a variable runType. If runType is one value, a certain

thread will run and if it is the other, the other will run. Is my approach

the most efficient? Will it turn out to give any errors?