11A functional interface has exactly one:ADefault methodBAbstract methodCFieldDStatic methodView AnswerDiscussWorkspaceReportSaveEasy
12Can an abstract class have a constructor?AOnly if it has no abstract methodsBOnly a private oneCNoDYesView AnswerDiscussWorkspaceReportSaveEasy
13Since Java 9, interfaces can also contain:Aprotected methodsBInstance fieldsCprivate methodsDConstructorsView AnswerDiscussWorkspaceReportSaveEasy
14Which is true about abstract classes vs interfaces?AInterfaces can have constructorsBAbstract classes can have instance state; interfaces cannotCAbstract classes cannot have concrete methodsDA class can extend many abstract classesView AnswerDiscussWorkspaceReportSaveEasy
15Can you create an object of an abstract class with new?ANoBOnly inside the same packageCOnly if it is publicDYesView AnswerDiscussWorkspaceReportSaveEasy