Compiler error cannot find symbol - Java

Question

First, I am very new to Java and my programming in general is rusty. So I might have missed something very simple.

The error:

cannot find symbol
symbol  : method setMethod(java.lang.String)
location: class ij.plugin.Thresholder
        Thresholder.setMethod("Mean");

Some code snippets: This part is third party code. I would like to avoid modifying this as much as possible

public class Thresholder implements PlugIn, Measurements, ItemListener {
    private static String staticMethod = methods[0];

    public static void setMethod(String method) {
        staticMethod = method;
    }
}

My code (well, some relevant parts)

    import ij.plugin.Thresholder;
    public class CASA_ implements PlugInFilter,Measurements  {
    public void run(ImageProcessor ip) {
        track(imp, minSize, maxSize, maxVelocity);
    }

    public void track(ImagePlus imp, float minSize, float maxSize, float maxVelocity) {
        Thresholder.setMethod("Mean");         <-- This is the line the compiler hates
    }
}

Why is the compiler looking for a setMethod method with a return of something other than void?

Thanks

Answer 1

As Makoto correctly states, you can't call Thresholder.setMethod("Mean") in the class declaration.

In a class implementing PlugInFilter, you have to define a run(ImageProcessor ip) and a setup(String arg, ImagePlus imp) method, so why don't you set the thresholding method during setup of your plugin filter:

import ij.IJ;
import ij.ImagePlus;
import ij.measure.Measurements;
import ij.plugin.Thresholder;
import ij.plugin.filter.PlugInFilter;
import ij.process.ImageProcessor;

public class CASA_ implements PlugInFilter,Measurements  {
    // define instance variables:
    ImagePlus imp;

    /**
     * implement interface methods
     */
    public int setup(String arg, ImagePlus imp) {
        this.imp = imp;
        Thresholder.setMethod("Mean");
        IJ.log("Setup done.");
        return DOES_ALL;
    }

    public void run(ImageProcessor ip) {
        // do your processing here
    }
}

Have a look at the ImageJ plugin writing tutorial or at Fiji's script editor and its templates (Templates > Java > Bare PlugInFilter) as a starting point.