Question

i have got a problem, lets say i have got code like that:

public static void main(String[] args)
{
startMethod1();
startMethod2();
}

Now, if startMethod1 method is very big and takes a lot of time to execute it, startMethod2 is started before startMethod1 has been finished.
How to make those methods execute 1 by 1?

Answer 1

startMethod2 is started before startMethod1 has been finished.

This will never happen. You can start threads in startMethod1 which could still be running as startmethod2 starts. startMethod2 cannot start before startMethod1 unless startMethod1 calls startMethod2

If you want to wait until the threads in startmethod1 have finished you have to Thread.join() them or use ExecutorService.awaitTermination()

How to make those methods execute 1 by 1?

Just as you have written the code.