question: factory method , responsible for creating the environment view . concode_field_sep PlaceHolder placeHolder concode_field_sep AgentAppFrame createFrame concode_elem_sep AgentAppController createController concode_elem_sep AgentAppFrame constructApplicationFrame concode_elem_sep void main concode_elem_sep void startApplication
target: AgentAppEnvironmentView function ( ) { return new EmptyEnvironmentView ( ) ; }