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Java supports three flavors of operators: unary, binary, and ternary. These types of operators can be applied to one, two, or three operands, respectively. For the exam, you need to know a specific subset of Java operators, how to apply them, and the order in which they should be applied.

Java operators are not necessarily evaluated from left-to-right order. In this following example, the second expression is actually evaluated from right to left, given the specific operators involved:

int cookies = 4; double reward = 3 + 2 * --cookies; System.out.print("Zoo animal receives: "+reward+" reward points");

In this example, you first decrement cookies to 3, then multiply the resulting value by 2, and finally add 3. The value then is automatically promoted from 9 to 9.0 and assigned to reward. The final values of reward and cookies are 9.0 and 3, respectively, with the following printed:

Zoo animal receives: 9.0 reward points

If you didn't follow that evaluation, don't worry. By the end of this chapter, solving problems like this should be second nature.