Difference between&nbsp;"implements Runnable" and&nbsp;"extends Thread" in Java <ol><li>Inheritance Option:&nbsp;The limitation with "extends Thread" approach is that if you extend Thread, &nbsp;you can not extend anything else . Java does not support multiple inheritance. &nbsp;In reality , you do not need Thread class behavior , because in order to use a thread you need to instantiate one anyway. On the other hand, Implementing the Runnable interface gives you the choice to extend any class you like , but still define behavior that will be run by separate thread.</li><li>Reusability:&nbsp;In "implements Runnable" , we are&nbsp;creating a different Runnable class for a specific behavior &nbsp;job (if the work you want to be done is&nbsp;job). It gives us the freedom to reuse the specific&nbsp;behavior job whenever required."extends Thread" &nbsp;contains both thread and job specific behavior code. Hence once thread completes execution , it can not be restart again.</li><li>Object Oriented Design:&nbsp;Implementing Runnable should be preferred . It does not specializing or modifying the thread behavior . You are giving thread something to run. We conclude that Composition is the better way. Composition means two objects A and B satisfies&nbsp;has-a &nbsp;relationship. "extends Thread" &nbsp;is not a good Object Oriented practice. </li><li>Loosely-Coupled:&nbsp;"implements Runnable" makes the code loosely-coupled and easier to read . Because the code is split into two classes . Thread class for the thread specific code and your Runnable implementation class for your job&nbsp;that should be run by a thread code. "extends Thread" &nbsp;makes the code tightly coupled . Single class contains the thread code as well as the job that needs to be done by the thread.</li><li>Functions Overhead:&nbsp;&nbsp;"extends Thread" &nbsp;means inheriting all the functions of the Thread class which we may do not need . &nbsp;job&nbsp;can be done easily by Runnable without the Thread class functions overhead.</li><li></li></ol>

Difference Between Runnable interface and Thread class in java

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