public interface Plugin { void process(Object data); } public class MyPlugin implements Plugin { public void process(Object data) { } } public class Grafter { private List<Plugin> plugins; public Grafter() { this.plugins = new ArrayList<>(); } public void registerPlugin(Plugin plugin) { this.plugins.add(plugin); } public void process(Object data) { for (Plugin plugin : plugins) { plugin.process(data); } } } public class Main { public static void main(String[] args) { Grafter grafter = new Grafter(); grafter.registerPlugin(new MyPlugin()); grafter.process(data); } }


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