What should be the method header for the equals method for a Lion class? To impl

Question

What should be the method header for the equals method for a Lion class? To implement a GUI in Javafx, what is the class that your GUI class have to extend? What is the header of the method that you have to override? Class name: ___ Method header: ___ Using an event handler to handle events is a common practice in GUI programming. What is the interface's name that you have to implement? What is the method that you have to override from that interface? You can assume we will handle ActionEvent. Interface name: ___ Method header: ___ Answer true or false for the following statements You can instantiate an interface (i.e. create an object directly from an interface) ___ You can instantiate an abstract class. ___ You can create an interface reference. ___ What is the primary purpose of designing an abstract class as a super class instead of a normal class as a super class? ___

Explanation / Answer

1. public Boolean equals(Lion otherLion)

equal method is always inherited from the class object.

2. Class name: control class

Method header: @override public void start(Stage primaryStage)

3. Interface name: Java.awt.ActionListener

Method header: public void actionPerformed(ActionEvent e)

4. False. You cannot instantiate an interface, because some of their methods might not have any definitions.

False. You cannotbinstantiate an abstract class. An abstract class may or may not have abstract methods.

True. Once Java class implements an Java interface, you can use an instance of that interface. You can then reference instances of that class as an instance of the interface.

5. The advantage of using abstract class is that you can group several related classes together as siblings. Grouping classes together is important in keeping a program organised and understandable. An abstract class is a way to organise inheritance, sometimes makes no sense to implement every method in a class (I.e. a predator class), it may implement some to pass to its children but some methods cannot be implemented without knowing what the class will do.

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