ITSC Final review

When one object is a specialized version of another object, there is this type of relationship between them

"is a"

If a class contains an abstract method

- You must create an instance of the class -The method cannot be overridden in derived classes - The method will have only a header, but not a body, and end with a semicolon

True of false An abstract class is not instantiated, but serves as a superclass for other classes

True

True or false All methods in an abstract class must also be declared abstract

True

True or false Every class has a toString method and an equals method inherited from the object class

True

True or false In an inheritance relationship, the derived class constructor always executes before the base class

True

True or false It is not possible for a superclass to call a subclass's method

True

When an "is a" relationship exists between objects, it means that the specialized object has

All the characteristics of the general object, plus additional characteristics

True of false: If a method in a subclass has the same signature as a method in the superclass, the subclass method overloads the superclass method

False

True or false When an interface variable references an object, you can use the interface variable to call all the methods in the class implementing the interface

False

T or F: If a sublclass constructor does not explicitly call a superclass constructor, the JVM will not call any of the superclasses constructors

False The JVM automatically inserts a call to the no-arg constructor of the superclass

True or false It two methods in the same class have the same name but different signatures, the second overrides the first

True

In the following statement, which is the superclass? public class ClassA extends ClassB implements ClassC

ClassB

When you write code that may cause a checked exception to be thrown(such as an IOException), you have two options to get the code to compile. What are the two options

Must invoke the exception in a try-catch block or declare to throw the exception in the calling method

Can a subclass ever directly access the private members of its superclass?

No, private members of a super class cannot be access in subclass

All classes directly or indirectly inherit from what class?

Object

Every class is either directly of indirectly derived from what class?

Object class

A subclass can directly access

Only public and protected members of the superclass class

A method in a subclass having the same name as a method in the superclass but a different signature is an example of

overloading

A method in a subclass having the same signature as a method in the superclass is an example of

overriding

Which access specifier gives access to members(fields or methods) to any subclasses?

public

Which of the following statements declares Salaraied as subclass of PayType?

public class Salaried extends PayType

Given the following code which of the following is true? public class ClassB implements ClassA

ClassB must override each method in ClassA

What does it mean to implement an interface?

Inheriting the abstract methods of the inheritance

In the following code, what will call to super do? public class ClassB extends ClassA { public ClassB() { super(40); System.out.println("THis is the last statement "); }

It will call the constructor of ClassA that receives an integer as an argument

Look at the following code to determine what the call to super will do. public class ClassB extends ClassA { public ClassB() { super(10); } }

It will call the constructor of ClassA that receives an integer as an argument

If a subclass constructor does not explicitly call a superclass constructor

Java will automatically call the superclass's default constructor immediately after the code in the subclass's constructor executes