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Thread: How to create your own packages?

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    Junior Member lil_misfitss's Avatar
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    Default How to create your own packages?

    Hello!

    I'm following a tutorial that is using eclipse but i use notepad++ to code. I know eclipse is better but I feel familiar with notepad++ and the cmd prompt. What I was wondering is how do you create your own packages and where do you put them. I have a package called jg.misfit.game.graphics and I put it in C:\Program Files\Java\jg\misfit\game\graphics. So far the file game has one class in it and the file graphics has one class in it. Did i put my package in the correct location, how do I make a package using the cmd prompt and should I just use eclipse? The reason I'm asking is because the class in game can't find the class in graphics when I compile it.

    javac: file not found Render.java
    Usage: javac <options> <source files>

    Thank you to all who respond!

    lil_misfit


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    Default Re: How to create your own packages?

    Packages are just folder structures (well, they are more than that, but digging deeper is unnecessary).
    You also need to specify the package for each class at the top (before the imports). Like:
    package jg.misfit.game.graphics;

    I would recommend eclipse, since it will do a lot of project management for you.
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    lil_misfitss (June 28th, 2014)

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    Super Moderator Norm's Avatar
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    Default Re: How to create your own packages?

    What folder did you issue the javac command in? You could be in the same one with the .java file. You'll need to set the classpath to point to the folder containing the package for the other classes.
    Can you copy the contents of the command prompt window and paste it here?
    To copy the contents of the command prompt window:
    Click on Icon in upper left corner
    Select Edit
    Select 'Select All' - The selection will show
    Click in upper left again
    Select Edit and click 'Copy'

    Paste here.
    If you don't understand my answer, don't ignore it, ask a question.

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    lil_misfitss (June 28th, 2014)

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    Junior Member lil_misfitss's Avatar
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    Default Re: How to create your own packages?

    Okay so I think the compiler is finding the Render.java file but now this appears when compiling Game.java:

    C:\Program Files\Java\jg\misfit\game>javac Game.java
    Game.java:9: error: cannot access Render
    import graphics.Render;
    ^
    bad source file: .\graphics\Render.java
    file does not contain class graphics.Render
    Please remove or make sure it appears in the correct subdirectory of the sourcepath.


    Thank you guys for replying!
    lil_misfit [COLOR="Silver"]

    --- Update ---

    So in the top of Game.java's code I put

    package jg.misfit.game;

    then in Render.java's code I put

    package jg.misfit.game.graphics;

    Is this correct?

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    Super Moderator Norm's Avatar
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    Default Re: How to create your own packages?

    The classpath needs to point to the folder that contains the package folder: graphics
    Where is the graphics folder located?
    If you don't understand my answer, don't ignore it, ask a question.

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    Junior Member lil_misfitss's Avatar
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    Default Re: How to create your own packages?

    The graphics folder is in the game folder: jg.misfit.game.graphics.
    So how do i change the classpath to include graphics folder?

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    Default Re: How to create your own packages?

    C:\Program Files\Java\jg\misfit\game>javac Game.java
    For that command, the classpath should point to the current folder: game
    so if graphics is in game, it should be on the classpath

    The java files in the graphics folder should be in package graphics.


    Can you make some small complete programs that compile and execute and have just the package, import statements and a new statement in the main() method. Have the other test programs without the main() print a message in their constructors.
    If you don't understand my answer, don't ignore it, ask a question.

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    lil_misfitss (July 4th, 2014)

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    Junior Member lil_misfitss's Avatar
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    Default Re: How to create your own packages?

    Sorry I haven't responded, been away from programming a bit. I will try that little "exercise" and see if I can get packages working! Thanks for all the help Norm the SUPER MODERATOR!

    lil_misfit

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