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?