"The program suddenly crashed... the cause was a NullPointerException.""Is error handling just about writing try-catch blocks ...

From Environment Setup to Your First Step"I want to start programming, but where should I begin?"For those of you asking this ...

I have developed a simple java prog that records the name of my pupils and their exam marks. At the moment the information that I enter is stored in vectors. Understandably I want to retain this ...