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Chapter 2: Programs, Data, Variables, and Calculation


In this chapter we will look at the entities in Java that are not objects – numbers and characters. This will give you all the elements of the language you need to perform numerical calculations, and we will apply these in a few working examples.

By the end of this chapter you will have learnt:

  • How to declare and define variables of the basic integer and floating point types

  • How to write an assignment statement

  • How integer and floating point expressions are evaluated

  • How to output data from a console program

  • How mixed integer and floating point expressions are evaluated

  • What casting is and when you must use it

  • What boolean variables are

  • What determines the sequence in which operators in an expression are executed

  • How to include comments in your programs

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