如何操纵图层的功能

Question

我想操纵Jframe中加载的图层的特征（我有多个图层）。你可以在下面找到我用来为图层充电的代码。请有人帮我。

File file = JFileDataStoreChooser.showOpenFile("shp", null);
        if (file == null) {
            return false;
        }

        FileDataStore store = FileDataStoreFinder.getDataStore(file);
        FeatureSource featureSource = store.getFeatureSource();
        // get vertices of file
        // Create a map context and add our shapefile to it
        if (mapContext == null) {

        }
        // make it look prettier
        Style style = SLD.createSimpleStyle(featureSource.getSchema(), color[next]);

        Layer layer = new FeatureLayer(featureSource, style);
        
        mapContext.addLayer(layer);
        return true;
    }