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Compile with flags in Java

 
Robin Trietsch
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Hi all,

I'm learning Java with the book HeadFirstJava, but I don't completely understand how you can compile with flags.
E.g.:

%cd MyProject/source
%javac -d ../classes com/headfirstjava/PackageExercise.java

Where do you enter this? I believe it's not in the actual code. They give a lot of flags in the book, but they don't tell you how to use them.

Hope someone can help. Thanks.
 
fred rosenberger
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it depends on what operating system you are using. Many of us old-timers on windows call it a DOS prompt. Go to start->run. type "cmd" in the pop up, and you'll get a black box with something like

C:\>

it is there that you enter the commands. If you are on a Mac, I can't help you. If you are on Unix/Linux, you should already know what they are talking about.
 
Jesper de Jong
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If you're using Windows, you'll type in those commands in a command prompt window. If you don't know what a command prompt window is and how to use it, then you can find tutorials for it on the web.

Note: The "%" in those commands should not be typed in, that's not part of the commands.

On Mac OS X or Linux, you'd use a terminal window for the same commands. Some commands might have slightly different syntax on Mac OS X or Linux compared to Windows.
 
Nico Van Brandt
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These commands are executed in the background when you compile your code in your IDE like Netbeans/Eclipse/IntelliJ
You can also compile your code manually without the need of an IDE. That is what is described in the book.
 
fred rosenberger
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If you are just starting out, most folks around here would recommended not using and IDE like Netbeans/Eclipse/IntelliJ. There is enough to learn just with Java that adding in a behemoth like those make it that much harder - and often you end up fighting with the tool rather than the language.

Get a simple text editor (I use ConText, but search around and you will find plenty of recommendations for others) and compile your code by hand on the command line.
 
Robin Trietsch
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Thanks for your replies. I do understand now how to use these commands.
 
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