Review 2 of Beginning Java. 

Summary: Programs, Data, Variables and Calculation 

There are several different types of variables, including integral data
types, floating point data types, and character data types. 

You can perform a variety of mathematical operations in Java, including
basic arithmetic, Boolean algebra and bitwise operations on binary
numbers. 

Sometimes you will need to convert one data type to another. This is
called casting. 

The Math class contains a large number of math functions, including sine
and cosine.