Chapter 4: Making the Most (Web design templates) of Variables and
Chapter 4: Making the Most of Variables and Their Values 91 Figure 4-8: The variable myFrame refers to an instance of the JFrame class. myFrame An object (an instance of the JFrame class) The JFrame class Another object (another instance of the JFrame class) Primitive type stew While I m on the subject of frames, what s a int hour; frame anyway? A frame is a window that has a int minutes; certain height and width and a certain location char amOrPm; on your computer s screen. So, deep inside the So notice that this high and mighty thing called declaration of the Frameclass, you can find a Java API class is neither high nor mighty. A variable declarations that look something like class is just a collection of declarations. Some this: of those declarations are the declarations of int width; variables. Some of those variable declarations int height; use primitive types, and other variable declaraint x; tions use reference types. These reference int y; types, however, come from other classes, and the declarations of those classes have vari Here s another example Time. An instance ables. The chain goes on and on. Ultimately, of the Timeclass may have an hour (a number everything comes, in one way or another, from from 1 to 12), a number of minutes (from 0 to 59), the primitive types. and a letter (a for a.m.; p for p.m.).
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