refresh a canvas to draw a new object

Hello everybody i'm new here and new on the opengl and 3d world i have successfuly load and display an obj file but whene i reload a new one by pressing开发者_开发知识库 a jbutton the new one is drawn under the old one please can you help me to refresh the glcanvas.

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You do not say what your jbutton does so im guessing you are reinitializing your drawable when you load your new object.. In my experience this only adds a new drawable to your canvas.. I would prefer to just change whats beeing drawn but if not heres how to close your current drawable/canvas:

        try {
            canvas.getContext().makeCurrent();
            canvas.getContext().release();
            canvas.getContext().destroy();
            drawable.getContext().makeCurrent();
            drawable.getContext().release();
            drawable.getContext().destroy();

        } catch (GLException releaseFailure) {
            releaseFailure.printStackTrace();
        }

And then reinitialize them when you add the new object..