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Chapter 3: Using the Basic Building Blocks 67 Figure 3-11: The Project Wizard s Project Paths tab. If you click Next instead of Finish, you see some other options that you don t need right now. So to avoid any confusion, just click Finish. Clicking Finish brings you back to JCreator s work area, with MyFirstProjectset in bold. The bold typeface means that MyFirstProjectis the active project. The next step is to create a new Java source code file. 8. In the File View pane, right-click MyFirstProject. Then choose Add. New Class from the context menu that appears, as shown in Figure 3-12. JCreator s Class Wizard opens. (See Figure 3-13.) Figure 3-12: Getting JCreator to add a new class. Like every other windowed environment, JCreator provides many ways to accomplish the same task. Instead of right-clicking MyFirstProject, you can go to the menu bar and choose File.New.Class. But right-clicking a project has a small benefit. If you right-click the name of a project, the newly created class is without a doubt in that project. If you use the menu bar instead, the newly created class goes in whichever project happens to be the active project. So if your workspace contains many projects, you can accidentally put the new class into the wrong project.
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66 Part I: Getting Started In MyWorkspace.jcw, the extension .jcwstands for JCreator workspace. After clicking Open, you see MyWorkspace in JCreator s File View pane. The next step is to create a new project within MyWorkspace. 4. In the File View pane, right-click MyWorkspace. Then choose Add New Project from the context menu that appears, as shown in Figure 3-9. JCreator s Project Wizard opens. (See Figure 3-10.) Figure 3-9: Getting JCreator to add a new project. Figure 3-10: The Project Wizard s Project Template tab. 5. In the wizard s Project Template tab, select the Empty Project icon, and then click Next. After clicking Next, you see the wizard s Project Paths tab, as shown in Figure 3-11. 6. In the Name field, type MyFirstProject. You can add blank spaces, making the name My First Project, but I don t recommend it. 7. Make sure that the Add to Current Workspace and Local Folder System radio buttons are selected, and then click Finish. You may have to click Finish twice once to tell JCreator to create the project, and a second time to tell JCreator to close the Project Wizard.
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Chapter 3: Using the Basic Building Blocks 65 The first */(after Intentionally displays) ends the traditional comment prematurely. Then the battlesand carefullystatements aren t commented out, and the last */chokes the compiler. So the best way to comment out code is to use end-of-line comments. But typing two slashes for each of ten lines can be tedious. Fortunately, JCreator has a good shortcut. Here s how it works: 1. Select the lines that you want to comment out. 2. From the JCreator menu bar, choose Edit.Format.Increase Comment Indent. When you do this, each selected line becomes an end-of-line comment. End-ofline comments can contain traditional comments (and end-of-line comments can contain other end-of-line comments) so you can comment out the Parents, pick your battles carefully!code with no unwanted side effects. If you decide later to uncomment the code, that s easy, too: 1. Select the lines that you no longer want to be commented out. 2. From the JCreator menu bar, choose Edit.Format.Decrease Comment Indent. Typing Your Own Code Chapter 2 is about running someone else s Java code (code that you download from this book s Web site). But eventually, you ll write code on your own. This section shows you how to create code with the JCreator development environment. The version of JCreator on this book s CD-ROM has a specially customized MyProjectsdirectory. The MyProjectsdirectory contains several ready- made workspaces. One of these workspaces (named MyWorkspace) has no projects in it. Here s how you create a project in MyWorkspace: 1. Launch JCreator. 2. From JCreator s menu bar, choose File.Open Workspace. An Open dialog box appears. 3. In the Open dialog box, select MyWorkspace.jcw (or simply MyWorkspace). Then click Open. Clicking Open may coax out a message box asking whether you want to Save the workspace modifications? If so, click Yes. Clicking Open may coax out another box asking if you want to . . . close all document Windows? If so, click Yes.
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64 Part I: Getting Started 5. In the dialog box s list, double-click the item labeled println(String Method in java.io.PrintStream. The documentation for the printlnmethod appears in the Editor pane. Using comments to experiment with your code You may hear programmers talk about commenting out certain parts of their code. When you re writing a program and something s not working correctly, it often helps to try removing some of the code. If nothing else, you find out what happens when that suspicious code is removed. Of course, you may not like what happens when the code is removed, so you don t want to delete the code completely. Instead, you turn your ordinary Java statements into comments. For instance, you turn the statement System.out.println( I love Java! ); into the comment // System.out.println( I love Java! ); This keeps the Java compiler from seeing the code while you try to figure out what s wrong with your program. Traditional comments aren t very useful for commenting out code. The big problem is that you can t put one traditional comment inside of another. For instance, suppose you want to comment out the following statements: System.out.println( Parents, ); System.out.println( pick your ); /* * Intentionally displays on four separate lines */ System.out.println( battles ); System.out.println( carefully! ); If you try to turn this code into one traditional comment, you get the following mess: /* System.out.println( Parents, ); System.out.println( pick your ); /* * Intentionally displays on four separate lines */ System.out.println( battles ); System.out.println( carefully! ); */
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Chapter 3: Using the Basic Building Blocks 63 What s Barry s excuse? For years, I ve been telling my students to put comments in their code, and for years I ve been creating sample code (like the code in Listing 3-1) with no comments in it. Why? Three little words: Know your audience. When you write complicated, real- life code, your audience is other programmers, information technology managers, and people who need help deciphering what you ve done. When I write simple samples of code for this book, my audience is you the novice Java programmer. Instead of reading my comments, your best strategy is to stare at my Java statements the statements that Java s compiler deciphers. That s why I put so few comments in this book s listings. Besides, I m a little lazy. Finding javadoc pages In Chapter 2, I encourage you to download a copy of the official Java API documentation. This API documentation is a huge collection of Web pages created automatically from javadoc comments. To access this documentation, do the following: 1. Follow Steps 1 and 2 in the step list that comes immediately after Listing 3-1 in this chapter. The code of Listing 3-1 appears in JCreator s Editor pane. 2. In the Editor pane, right-click the word System. In the resulting context menu, choose Show JDK Help. The javadoc page for Systemappears in JCreator s Editor pane. To see more of this page, use the pane s scrollbar. The stuff on this page may not make much sense to you now, but as you read more of this book, things become clearer. For tips on reading and understanding Java s API documentation, see this book s Web site. 3. Click the Displayer.java tab at the top of the Editor pane. The code of Listing 3-1 appears once again. 4. In the Editor pane, right-click the word println, and choose Show JDK Help from the context menu that appears. A dialog box appears. The dialog box shows you a list of things in the Java API, each having the same name println.
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62 Part I: Getting Started The programmer doesn t create two separate things some Java code over here and some documentation about the code over there. Instead, the programmer creates one piece of Java code and embeds the documentation (in the form of javadoc comments) right inside the code. Best of all, the generation of Web pages from javadoc comments is done automatically. So everyone s documentation has the same format. No matter whose Java code you use, you find out about that code by reading a page like the one in Figure 3-8. That s good because the format in Figure 3-8 is familiar to anyone who uses Java. You can generate your own Web pages from the javadoc comments that you put in your code. To discover how, visit this book s Web site. Figure 3-8: The javadoc page generated from the code in Listing 3-6.
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Chapter 3: Using the Basic Building Blocks 61 The Java programming language has three different kinds of comments: Traditional comments: The first five lines of Listing 3-6 form one traditional comment. The comment begins with /*and ends with */. Everything between the opening /*and the closing */is for human eyes only. No information about Java For Dummies or Wiley Publishing, Inc.is translated by the compiler. To read about compilers, see Chapter 2. The second, third, and fourth lines in Listing 3-6 have extra asterisks (*). I call them extra because these asterisks aren t required when you create a comment. They just make the comment look pretty. I include them in Listing 3-6 because, for some reason that I don t entirely understand, most Java programmers add these extra asterisks. End-of-line comments: The text //Changed to I in Listing 3-6 is an end-of-line comment. An end-of-line comment starts with two slashes, and goes to the end of a line of type. Once again, no text inside the end- of-line comment gets translated by the compiler. Javadoc comments: A javadoc comment begins with a slash and two asterisks (/**). Listing 3-6 has two javadoc comments one with text The Displayer class . . .and another with text Execution of the program. . . . A javadoc comment is a special kind of traditional comment. A javadoc comment is meant to be read by people who never even look at the Java code. But that doesn t make sense. How can you see the javadoc comments in Listing 3-6 if you never look at Listing 3-6? Well, a certain program called javadoc (what else?) can find all the javadoc comments in Listing 3-6 and turn these comments into a nice- looking Web page. The page is shown in Figure 3-8. Javadoc comments are great. Here are several great things about them: The only person who has to look at a piece of Java code is the programmer who writes the code. Other people who use the code can find out what the code does by viewing the automatically generated Web page. Because other people don t look at the Java code, other people don t make changes to the Java code. (In other words, other people don t introduce errors into the existing Java code.) Because other people don t look at the Java code, other people don t have to decipher the inner workings of the Java code. All these people need to know about the code is what they read in the code s Web page.
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60 Part I: Getting Started meaningless to her. She had written a million lines of code and not one line was accompanied by an informative explanatory comment. She had left no clues to help her understand what she d been thinking; so in frustration, she abandoned the whole project. Adding comments to your code Listing 3-6 has an enhanced version of this chapter s sample program. In addition to all the keywords, identifiers, and punctuation, Listing 3-6 has text that s meant for human beings to read. Listing 3-6: Three Kinds of Comments /* * Listing 3-6 in Java For Dummies * * Copyright 2006 Wiley Publishing, Inc. All rights reserved. */ /** * The Displayer class displays text on the computer screen. * * @author Barry Burd * @version 1.6 02/21/06 * @see java.lang.System */ class Displayer { /** * Execution of the program starts at this main method. * * @param args (See Chapter 11.) */ public static void main(String args[]) { System.out.println( I love Java! ); //Changed to I } } A comment is a special section of text inside a program. It is text whose purpose is to help people understand the program. A comment is part of a good program s documentation.
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Chapter 3: Using the Basic Building Blocks 59 Figure 3-7: A class is bigger than a method; a method is bigger than a statement. Class Displayer{ } System.out.println ( You’ll love Java! ); publicstaticvoid main (String args[]) { } public static void main (String args[]){ } And Now, a Few Comments People gather around campfires to hear the old legend about a programmer whose laziness got her into trouble. To maintain this programmer s anonymity, I call her Jane Pro. Jane worked many months to create the holy grail of computing a program that thinks on its own. If completed, this program could work independently, learning new things without human intervention. Day after day, night after night, she labored to give the program that spark of creative, independent thought. One day, when she was almost finished with the project, she received a disturbing piece of paper mail from her health insurance company. No, the mail wasn t about a serious illness. It was about a routine office visit. The insurance company s claim form had a place for her date of birth, as if her date of birth had changed since the last time she sent in a claim. She had absentmindedly scribbled 2006 as her year of birth, so the insurance company refused to pay the bill. Jane dialed the insurance company s phone number. Within twenty minutes she was talking to a live person. I m sorry, said the live person. To resolve this issue you must dial a different number. Well, you can guess what happened next. I m sorry. The other operator gave you the wrong number. And then I m sorry. You must call back the original phone number. Five months later, Jane s ear ached, but after 800 hours on the phone she had finally gotten a tentative promise that the insurance company would eventually reprocess the claim. Elated as she was, she was anxious to get back to her computer programming project. Could she remember what all those lines of code were supposed to be doing? No, she couldn t. She stared and stared at her own work and, like a dream that doesn t make sense the next morning, the code was now completely
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58 Part I: Getting Started In an outline, some items are at the bottom of the food chain. In the Displayer class, the corresponding line is the line that begins with System.out. println. Accordingly, this System.out.printlnline goes inside all the other curly braces and is indented more than anything else. Never lose sight of the fact that a Java program is, first and foremost, an outline. If you put curly braces in the wrong places or omit curly braces where the braces should be, your program probably won t work at all. If your program works, it ll probably work incorrectly. If you don t indent lines of code in an informative manner, your program will still work correctly, but neither you nor any other programmer will be able to figure out what you were thinking when you wrote the code. If you re one of those visual thinkers, you could picture outlines of Java programs in your head. One friend of mine visualizes an actual numbered outline morphing into a Java program. (See Figure 3-6.) Another person, who shall remain nameless, uses more bizarre imagery. (See Figure 3-7.) class Displayer { public static void main(String args[]) { System.out.println(”You’ll love Java!”); } } I. class Displayer A. public static void main(String args[]) 1. System.out.println(”You’ll love Java!”); I. The Dispayer class A. The main method 1. Print “You’ll love Java!” Figure 3-6: An outline turns into a Java program.
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