CareerCup

If you implement the Runnable interface, you can only override and use the run() method. However, if you wish to use method related to parallel processing, the Thread class would be useful. The thread class provides methods like activeCount(),destroy(),dumpStack().. etc. Hence, if you need to use more than just the run() method, the thread class is useful.

Runnable is just an interface with run() method. Thread is the actual class with all the important methods to handle threads.

Runnable is used to make sure that run method is implemented in class. We need thread instance to create new thread( it create separate stack and thread related stuffs)

if a class implements Runnable u can extend other classes which you might need..but if you write a thread code by extending threads..u cant extend any other class..

obviously, class and interface is different. Interface is more abstract, so you have to define your own methods in class

I totally agree with newbie !! Thats the perfect answer for it !

I really think in new version of JDK the thread call can be option to create a new thread because we should be able create a thread just implementing an interface or even using an annotation. The code to create a thread is should not imposed to application developer rather should be handle at JVM level by annotation processing tool like when annotate class with @Servlet it become a servlet in servlet 3.0 spec.

when we use create thread by using Thread as class we need to extend it.
when we use create thread by using Runnable as class we need to implement it.
In place where it is need to extend more than one class we use Runnable interface.

A class that implements Runnable is not a thread and just a class.For a Runnable to become a Thread, You need to create an instance of Thread and passing itself in as the target

Java does not support multi-inheritance so a possible reason