Howconstructorsareusedininheritance hierarchies. ThemethodsofclassObject,thedirectorindirect superclassofallclassesinJava. 2005PearsonEducation,Inc.Allrightsreserved. 3 9.1Introduction 9.2SuperclassesandSubclas
Subclasses inherit those superclass members declared with no access specifier as long as the subclass is in the same package as the superclass. 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 va...
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 ...