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Thread: Using Protected Methods, in a Java Library

  1. #1
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    Default Using Protected Methods, in a Java Library

    Hey, there are a set of java image processing classes I want to use.
    It is a library online... "JHLabs Java Image processing"...

    Download Java Image Processing Classes

    The java docs are here...
    com.jhlabs.image


    For example the class EdgeFilter ... I cant use because the the method that actually does the Edge filtering is a protected method

    ...
    protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace )
    ....

    Same with ErodeFilter etc.. I can make instances of these classes but I cant use its actual necessary function.
    That is same with all the image classes that I want to use.


    Is there anything I am missing... How can I possibly use this library of classes with the netbeans project that I am doing. (I have imported the jar file library this comes with)


    Thanks in advance.


  2. #2
    Administrator copeg's Avatar
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    Default Re: Using Protected Methods, in a Java Library

    Typically the access modifier is set for a reason (see http://download.oracle.com/javase/tu...sscontrol.html)...so my guess is that these functions are not meant to be accessed in the way you want to. That being said, given the access levels you could extend the class and access the method from that child class

    Edit: This thread has been cross posted here:

    http://www.java-forums.org/new-java/40326-using-protected-methods-java-library.html

    Although cross posting is allowed, for everyone's benefit, please read:

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    See The problems with cross-posting

    Last edited by copeg; March 10th, 2011 at 04:06 PM.

  3. #3
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    Default Re: Using Protected Methods, in a Java Library

    So I make a class that extends the class with the protected method.
    And in the class that I'm doing all my image processing stuff I should make an instance of the extended class.
    Do you think I should do this?

    If I just put extend on the class I can access the method right?

    Oh and I didn't know about the cross posting, sorry wont do this again...

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