| If a Thread is not require to return anything after completing the job then we should use Runnable | If a Thread is required to return something after completing the job then we should use Callable. |
Runnable interface in Java contains only one method: run() | The callable interface in Java contains only one method: call() |
Runnable jobs don’t return anything, Hence return type of run() is void | Callable jobs return something, Hence return type of call() is object. |
| If there is any chance of a checked exception in run() then it is compulsory that we have to handle that exception by using the try-catch block because we can not use the throws keyword for a run(). | If there is any chance of a checked exception in call() then we are not required to use try catch to handle that exception because call() already throws an exception. |
The runnable interface is present inside java.lang package | The callable interface is present in java. util.concurrent package |
| The runnable interface is introduced in Java 1.0v | The callable interface is introduced in Java 1.5v |