visual basic 2008 barcode generator The HelloWorld program in Java

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The HelloWorld program
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If you are using Notepad, select Save As You ll notice that the default file name is *txt Replace this with HelloWorldjava To open this file in Notepad, you ll need to change File Type from Text Document (*txt) to All Files (**) in order to see files that have extensions other than *txt
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I ll explain the parts of the HelloWorldjava program in the next section For now, let s compile and run the program You run the compiler from the command line If you are using a Windows computer, open a Command Prompt window If you are using a Unix/Linux computer, you ll need to open a shell window Type following at the prompt and then press ENTER:
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javac HelloWorldjava
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A new command prompt appears on the screen if the Java program successfully compiled If you display the directory, you ll see HelloWorldclass, which is the bytecode file of your program On a Windows computer, you display the directory at the command prompt by typing dir then pressing ENTER On a Unix/Linux computer, type ls and press ENTER If compiling was not successful, you might see a variety of things on the screen Here are some of them, along with possible solutions:
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'javac' is not recognized as an internal or external command, operable
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program or batch file There are two likely causes of this type of error First, you downloaded the J2SDK but didn t install it If this is the case, you need to install the J2SDK Second, you installed the J2SDK but didn t place the J2SDK s bin subdirectory on your computer s path If this is the case, you need to place the bin subdirectory on your computer s path "should be declared in a file named " If you see this as part of the message displayed on the screen after you tried to compile the Java program, the likely cause is you didn t use the exact spelling shown in this chapter Filenames must be typed just as they appear in this chapter, including upper- and lowercase letters Double-check the spelling and the case javac: invalid flag: If you see this message followed by a long list of words that begin with a hyphen, the compile likely can t find the Java program file Display the current directory to be sure you see HelloWorldjava in the directory If you don t see it there, then resave the Java program file to that directory Another possibility is that you misspelled the name of the file when you tried to compile it
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Try again, making sure you spell the filename correctly Another common problem is that you did not include the file extension with the filename when you compiled the file You must include java when compiling a file HelloWorldjava:6: ';' expected Any time you see a message displayed that contains the word expected, suspect that a syntax error has occurred A syntax error simply means that the compiler didn t understand something you wrote in your program file The message is usually followed by the part of your program the compiler didn t understand Here s how to fix the problem: The number next to the filename in the message tells you the line number of the program that is likely to have caused the problem In this example, line 6 contains the problem instruction Alongside the line number is the Java syntax the compiler expected to see in your program In this example, the compiler expected to see a semicolon Also, look carefully at the code displayed along with the message You ll see a caret (^) pointing to the place in the code where the compiler discovered the problem With all these clues at hand, your job is to display your Java program in your editor, make the necessary corrections, and then recompile your program
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