Chapter 2: Programs, Data, Variables, and Calculation
Overview
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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