How to creates threads?

Answer 1

solution 01: creating two parallel threads by implementing the Runnable interface, i.e. adding a "run" method.

solution 02: alternatively, we may create two parallel threads by deriving our class from the "Thread" class. in this case, we also have to provide a "run" method, because Threaduses the Runnable interface.

An example for this is...

public class csj01x3 extends Thread { public static void main(String args[]) throws Throwable { new csj01x3().start(); new csj01x3().start(); // main thread is ending here, // Thread-0 and Thread-1 continue to run. } public void run() { try { for (int i=0; i<100; i++) { System.out.println("thread " +Thread.currentThread().getName()+" step "+i); Thread.sleep(500); } } catch (Throwable t) { } } }

this produces an output as solution 01, but it has one tradeoff: as we derive our class from Thread, we can no longer derive it from anything else. therefore solution 01 is more flexible.