[Solved] Creating custom java exception [duplicate]

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This should help you for scanning Integer values.

try{
    System.out.print("Enter an integer: ");
    int number = input.nextInt();  
    }
    catch (InputMismatchException ex) {
        System.out.println("Incorrect input: an integer is required)");
        //It's also possible to throw your custom Exception here, like "throw new CustomException();"
    }

About the IndexOutOfBoundsException, just write a try catch block around the area, where you expect that exception and throw your own custom exception.

try{
    ...
}catch(IndexOutOfBoundsException e){
    throw CustomException2();
}

solved Creating custom java exception [duplicate]