| Runnable | Callable |
| Available in java.lang package. | Available in java.util.concurrent package. |
| Method: void run() | Method: V call() throws Exception |
| It cannot return any value. | It can return value. |
| It cannot throw checked exception. | It can throw checked exception. |
| class TestThread implements Runnable { @override public void run(){ //do something } } | class TestThread implements Callable<String> { @override public String call() throws Exception { //do something return “w3spoint.com”; } } |
