Class Diagram Example: Real Example (Catalina Classes)

/*
* Interface and generalization relationships in Jakarta Catalina
*/

class HttpResponseBase
        extends ResponseBase
        implements HttpResponse, HttpServletResponse {}

abstract class HttpResponseWrapper
        extends ResponseWrapper
        implements HttpResponse {}

class HttpResponseFacade
        extends ResponseFacade
        implements HttpServletResponse {}

abstract class ResponseWrapper implements Response {}
abstract interface HttpResponse extends Response {}
abstract class ResponseBase implements Response, ServletResponse {}
abstract interface HttpServletResponse {}
class ResponseFacade implements ServletResponse {}

abstract interface ServletResponse {}
abstract interface Response {}