What does implements runnable mean in java

Could u pls elaborate? By implementing Runnable interface, we can only override the run method. But when we extend Thread class, we can use many methods based on our requirements. If we want to make our class as a thread, we can always go for extending the Thread class rather than implementing Runnable interface.

As per my understanding, Thread is a curse in java. If you create multiple threads then there would be a chance of memory overhead and hence the performance of the app will go down. As per my knowledge, the advantage is — when there are multiple threads then, memory usage would be more in case of extends Thread.

Because, each of your threads contains unique object associated with it. Where as, memory usage would be less in case of implements Runnable. Because, many threads can share the same runnable instance. You are right Gopi. Point 5 state the same thought as you. Many threads can share the same Thread object, same as Runnable instance. Difference between Thread and Runnable I found is, Thread class provides apis to configure Thread instance based on your need. If you extends Thread class, then 1.

There are apis available in Thread class which is not avaialbe in Runnable. Those apis helps developers to configure Thread properties. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. Output shows two active threads in the program — main thread and Thread-0, main method is executed by the Main thread but invoking start on RunnableImpl creates and starts a new thread — Thread What happens when Runnable encounters an exception?

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