反射简化switch语句

 public class FactoryModule {

    public ModuleIntf getModule(String moduleType) {
        ModuleIntf module = null;
        switch (moduleType) {
        case "Db":
            module = new ModuleDbImpl();
            break;
        case "File":
            module = new ModuleFileImpl();
            break;
        default:
//            unknown module type
            break;
        }
        return module;
    }
}

public class FactoryModule {

    public ModuleIntf getModuleByRef(String moduleType) {

        try {
            return (ModuleIntf) Class.forName("com.design.factory.Module" + moduleType + "Impl").newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

}