continuing execution after an exception is thrown in java

Question

I m trying to throw an exception  without using a try catch block  and my program finishes right after the exception is thrown  Is there a way that after I throw the exception  to then continue execution of my program  I throw the InvalidEmployeeTypeException which I ve defined in another class but I d like the program to continue after this is thrown       private void getData   throws InvalidEmployeeTypeException       System out println  Enter filename          Scanner prompt   new Scanner System in        inp   prompt nextLine         File inFile   new File inp       try           input   new Scanner inFile         catch  FileNotFoundException ex            ex printStackTrace            System exit 1              String type  name      int year  salary  hours      double wage      Employee e   null        while input hasNext              try          type   input next            name   input next            year   input nextInt             if  type equalsIgnoreCase  manager      type equalsIgnoreCase  staff                  salary   input nextInt                if  type equalsIgnoreCase  manager                      e   new Manager name  year  salary                             else                   e   new Staff name  year  salary                                   else if  type equalsIgnoreCase  fulltime      type equalsIgnoreCase  parttime                  hours   input nextInt                wage   input nextDouble                if  type equalsIgnoreCase  fulltime                      e   new FullTime name  year  hours  wage                             else                   e   new PartTime name  year  hours  wage                                   else                 throw new InvalidEmployeeTypeException                input nextLine                 continue                       catch InputMismatchException ex                          System out println     Error  Invalid input                    input nextLine                 continue                           catch InvalidEmployeeTypeException ex                                       employees add e

User · Answer

If you have a method that you want to throw an error but you want to do some cleanup in your method beforehand you can put the code that will throw the exception inside a try block, then put the cleanup in the catch block, then throw the error.

try {

    //Dangerous code: could throw an error

} catch (Exception e) {

    //Cleanup: make sure that this methods variables and such are in the desired state

    throw e;
}

This way the try/catch block is not actually handling the error but it gives you time to do stuff before the method terminates and still ensures that the error is passed on to the caller.

An example of this would be if a variable changed in the method then that variable was the cause of an error. It may be desirable to revert the variable.

User · Answer

If you throw the exception  the method execution will stop and the exception is thrown to the caller method  throw always interrupt the execution flow of the current method  a try catch block is something you could write when you call a method that may throw an exception  but throwing an exception just means that method execution is terminated due to an abnormal condition  and the exception notifies the caller method of that condition   Find this tutorial about exception and how they work - http   docs oracle com javase tutorial essential exceptions

User · Answer

Try this   try       throw new InvalidEmployeeTypeException        input nextLine      catch InvalidEmployeeTypeException ex            do error handling    continue

[java] continuing execution after an exception is thrown in java

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