Both extending the Thread class and implementing the Runnable interface can be used to create threads in Java, but implementing the Runnable interface is generally considered to be a better approach.
Here are some reasons why:
- Separation of concerns: By separating the task to be performed by the thread from the thread’s behavior itself, implementing the Runnable interface follows the principle of separation of concerns. This allows for more modular code that is easier to read and maintain.
- Flexibility: Implementing the Runnable interface allows the class to extend other classes or implement other interfaces, which is not possible when extending the Thread class. This provides more flexibility in the design of the code.
- Resource utilization: Creating a new thread by extending the Thread class creates a new object each time, which can lead to increased memory consumption. On the other hand, implementing the Runnable interface allows multiple threads to share the same object, which can lead to better utilization of resources.
- Better suited for concurrent programming: Implementing the Runnable interface is a more general solution that is better suited for concurrent programming because it separates the concerns of the thread’s behavior and the task it is performing. This allows for more efficient use of resources and greater flexibility in the design of the code.
In summary, while both extending the Thread class and implementing the Runnable interface can be used to create threads in Java, implementing the Runnable interface is generally considered to be a better approach because it provides better separation of concerns, greater flexibility, better resource utilization, and is better suited for concurrent programming.