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I am using Geotools to display a road map of Bangalore
Filter filter;

FileDataStore store= FileDataStoreFinder.getDataStore(file);

SimpleFeatureSource featureSource=store.getFeatureSource();

SimpleFeatureCollection fc=featureSource.getFeatures(filter);

SimpleFeatureIterator iter=fc.features();

Set<FeatureId> IDs=new HashSet<FeatureId>();

try{

while(iter.hasNext()){

SimpleFeature f=iter.next();

IDs.add(f.getIdentifier());

System.out.println(" "+f.getIdentifier());

}

iter.close();

Style style=createSelectedStyle(IDs);

MapContext map=new DefaultMapContext();

map.addLayer(featureSource,style);

JMapFrame.showMap(map);

private Style createSelectedStyle(Set<FeatureId> IDs) {
    Rule selectedRule = createRule(SELECTED_COLOUR, SELECTED_COLOUR);
    selectedRule.setFilter(ff.id(IDs));

    Rule otherRule = createRule(LINE_COLOUR, FILL_COLOUR);
    otherRule.setElseFilter(true);

    FeatureTypeStyle fts = sf.createFeatureTypeStyle();
    fts.rules().add(selectedRule);
    fts.rules().add(otherRule);

    Style style2 = sf.createStyle();
    style2.featureTypeStyles().add(fts);

    return style2;
}

private Rule createRule(Color outlineColor, Color fillColor) {
    Symbolizer symbolizer = null;
    Fill fill = null;//not required if working with line
    Stroke stroke = sf.createStroke(ff.literal(outlineColor), ff.literal(LINE_WIDTH));

    symbolizer = sf.createLineSymbolizer(stroke, "the_geom");

    Rule rule = sf.createRule();
    rule.symbolizers().add(symbolizer);
    return rule;
}