Curly Braces for a Java Class in Java

Generation Code 39 Extended in Java Curly Braces for a Java Class

class Displayer { public static void main(String args[]) { Systemoutprintln( You ll love Java! ); } } In an outline, some stuff is subordinate to a capital letter A item In a Java program, some lines are subordinate to the method header To indicate that something is subordinate to a method header, you use curly braces (See Listing 3-5)

Listing 3-5:

class Displayer { public static void main(String args[]) { Systemoutprintln( You ll love Java! ); } }

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 Systemout println Accordingly, this Systemoutprintln line 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)

I The Dispayer class A The main method 1 Print "You'll love Java!"

I class Displayer A public static void main(String args[]) 1 Systemoutprintln("You'll love Java!");

class Displayer { public static void main(String args[]) { Systemoutprintln("You'll love Java!"); } }

Class Displayer{ }

public static void main (String args[]) args[]){ } { }

Systemoutprintln ( You'll love Java! );

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