What must be true if a child of an abstract parent class does not override all of the parent's abstract methods?

The child class itself must be declared to be abstract.

Which problem may arise if we use abstract class functions for polymorphism?

All the derived classes must implement the undefined functions

Which of the following is true about interfaces in java

- An interface can contain following type of members. - A class can implement multiple interfaces. - Many classes can implement the same interface.

Can an object of a child type be assigned to a variable of the parent type? For example, Card crd; BirthDay bd = new BirthDay("Lucinda", 42); crd = bd; // is this correct?

Yes--an object can be assigned to a reference variable of the parent type.

Can an abstract method be defined in a non-abstract class?

No--if a class defines an abstract method the class itself must be abstract.

A method must do either of two things with a checked exception. What are those two things?

(1) Handle the exception in a catch{} block, (2) throw the exception to the method that called this method.

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Question

It is the ability of objects belonging
to different types to respond to methods of the
same name, each one according to the right type-specific behavior.

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It is the ability to redefine methods for derived
classes.

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Question	Answer
It is the ability of objects belonging to different types to respond to methods of the same name, each one according to the right type-specific behavior.	Polymorphism
It is the ability to redefine methods for derived classes.	Polymorphism
Using one method identifier to refer to multiple functions in the same class	Method Overloading
Creating more than one constructor in a class	Constructor Overloading
creating multiple methods having same name in one class	Method Overloading
Providing a different implementation of a method in a subclass of the class that originally defined a method.	Method Overriding
It is the ability for a message/data to be processed in more than one form	Polymorphism
What must be true if a child of an abstract parent class does not override all of the parent's abstract methods?	The child class itself must be declared to be abstract.
The ability to define more than one function with the same name is called?	Polymorphism
Which problem may arise if we use abstract class functions for polymorphism?	All the derived classes must implement the undefined functions
Polymorphism is particularly effective for implementing layered software systems. (t/f)	True
Which of the following is true about interfaces in java	- An interface can contain following type of members. - A class can implement multiple interfaces. - Many classes can implement the same interface.
A class can inherit from multiple abstract classes. (t/f)	False
Which of the following classes fail to compile? abstract class X { abstract void method(); } abstract class Y extends X { void Method() { } } abstract class Z extends Y { void Method() { System.out.println("Class Z"); } }	all compiles
Can an object of a child type be assigned to a variable of the parent type? For example, Card crd; BirthDay bd = new BirthDay("Lucinda", 42); crd = bd; // is this correct?	Yes--an object can be assigned to a reference variable of the parent type.
Can an abstract method be defined in a non-abstract class?	No--if a class defines an abstract method the class itself must be abstract.
A method must do either of two things with a checked exception. What are those two things?	(1) Handle the exception in a catch{} block, (2) throw the exception to the method that called this method.
Assertions can't be enabled or disabled on a class-by-class basis.	False
It is bad practice to throw an AssertionError explicitly.	False

Created by: gabsky

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