Question

What does try do in java?

Answer 1

The try/catch/finally construct allows you to specify code that will run in case an exception has occured inside of the try block (catch), and/or code that will run after the try block, even if an exception has occured (finally).

 try{
    // some code that could throw  MyException;
 }
 catch (MyException e){
     // this will be called when MyException has occured
 }
 catch (Exception e){
     // this will be called if another exception has occured
     // NOT for MyException, because that is already handled above
 }
 finally{
     // this will always be called,
     // if there has been an exception or not
     // if there was an exception, it is called after the catch block
 }

Finally blocks are important to release resources such as database connections or file handles no matter what. Without them, you would not have a reliable way to execute clean-up code in the presence of exceptions (or return, break, continue and so on out of the try block).