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By Jean-Paul Tremblay

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Class as a type. A class name may be used as a type, and a variable declared with that type can contain the name of a folder of that type. For example, variable w of type JFrame can contain the name of a folder that goes in JFrame’s file drawer. • Null. The value null represents the absence of the name of an instance. component-name gives an error message. 6 Self-review exercises This section introduced many new concepts, and it is important that you digest them at this point because the rest of the text builds on them.

1, and we recommend that you read the beginning of that section now. 2 Variables, declarations, and assignments 29 name starts with a lowercase letter. g. numberOfApples. 1 Self-review exercises In these exercises, you get practice with the assignment statement and using variables in expressions. DrJava provides an easy way to get this practice (by far the easiest that we are aware of, in fact), but it can be done in other IDEs as well. SR1. Type in this assignment statement and expression. What does Java say?

141592653589793. 2. 564E15, the exponent is 15. The maximum exponent is 308. So if you write 1E309, Java will tell you that the exponent is too large. If you write 1E308*10, Java will evaluate this to Infinity, and any values that are created using it as an operand are garbage. Java has notations for referencing the smallest positive double value and the largest positive double value. MAX_VALUE Lesson 6-4 discusses the fact that double operations are approximations. 0999999999999996) The last operation illustrates an important point with regard to double operations: often, they give only approximations to the real result.

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