September 2005
Beginner
576 pages
13h 6m
English
Content preview from SAMS Teach Yourself Programming with Java™ in 24 Hours, FOURTH EDITIONBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Putting One Class inside Another
Although a Java program is sometimes called a class, there are many occasions when a program requires more than one class to get its work done. A multiclass program consists of a main class and any helper classes that are needed. These helper classes earn their name by helping the main class do its work.
An example might be a Java applet that displays a scrolling headline as part of its graphical user interface. The headline could be an independent object in the program, just like other interface elements such as buttons and scroll bars. It makes sense to put the headline into its own class, rather than including its variables and methods in the applet class.
When you divide a program into multiple classes, there ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.