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In a java program, I spawned one thread other than the main thread, and then spawned another two threads from the original thread I created(two sub threads). In all the cases I used the Runnable interface to create threads. My question is, is there a better way of doing this? Does the performance degrade when you spawn threads recursively?
There is no such thing as a parent-child relationship between threads in Java. Once created, they have a life of their own.
Regarding performance, you may want to use an ExecutorService to control the number of threads created in your application. Too many threads will kill performance for sure. See the Executors class too.
The way you are creating threads is perfectly ok if it is only a few. Otherwise, executor services are the preferred method.