Howconstructorsareusedininheritance hierarchies. ThemethodsofclassObject,thedirectorindirect superclassofallclassesinJava. 2005PearsonEducation,Inc.Allrightsreserved. 3 9.1Introduction 9.2SuperclassesandSubclasses 9.3protectedMembers 9.4RelationshipbetweenSuperclassesandSubclasses ...
Subclasses don't inherit a superclass's member if the subclass declares a member with the same name. In the case of member variables, the member variable in the subclass hides the one in the superclass. In the case of methods, the ...
theirsubclasses. subclass―is-a‖superclass 类的继承 classCar { intcar_number; voidset_number(intcar_num) { car_number=car_num; } voidshow_number() { System.out.println(―MycarNo.is:‖+car_number); } } TrashCarextendsCar(1)
• by implementing the java.lang.Runnable interface in filling in the run() method with the required logic, then creating the AsyncEventHandler instance using the con- structor which takes the Runnable interface as parameter. With this mechanismhandlers inherit fromother ...