Java Gently, Third Edition

Chapter 4. Input and output

4.1 Inputting interactively

4.2 User-friendly input–output

4.3 Creating and accessing packages

4.4 Selection with if-else

4.5 File input and output

4.6 Handling exceptions

In this chapter we focus on input and output and introduce two custom-made Java classes that give a simple yet powerful means of interacting with a program. By being able to read in values to a program, we change its state. Two other ways of changing the state are by means of explicit selection (the if-statement) and reacting to exceptions. Using the IO classes both on the screen and with files requires that we know how to create and use packages, which is ...