Question 1

If a class contains an abstract method,

Accepted Answer

A)  you cannot create an instance of the class 
B)  the method will have only a header,but not a body,and end with a semicolon 
C)  the method must be overridden in subclasses 
D)  All of the above 
A)  you cannot create an instance of the class 
B)  the method will have only a header,but not a body,and end with a semicolon 
C)  the method must be overridden in subclasses 
D)  All of the above

Question 2

If a subclass constructor does not explicitly call a superclass constructor,

Accepted Answer

A)  it must include the code necessary to initialize the superclass fields. 
B)  the superclass fields will be set to the default values for their data types. 
C)  Java will automatically call the superclass's default or no-arg constructor immediately after the code in the subclass's constructor executes. 
D)  Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes. 
A)  it must include the code necessary to initialize the superclass fields. 
B)  the superclass fields will be set to the default values for their data types. 
C)  Java will automatically call the superclass's default or no-arg constructor immediately after the code in the subclass's constructor executes. 
D)  Java will automatically call the superclass's default or no-arg constructor just before the code in the subclass's constructor executes.

Question 3

Look at the following code.Which line will cause a compiler error? Line 1 public class ClassA
Line 2 {
Line 3 public ClassA(){}
Line 4 public int method1(int a){}
Line 5 public final int method2(double b){}
Line 6 }
Line 7 public ClassB extends ClassA
Line 8 {
Line 9 public ClassB(){}
Line 10 public int method1(int b){}
Line 11 public int method2(double c){}
Line 12 }

Accepted Answer

A)  4 
B)  5 
C)  10 
D)  11 
A)  4 
B)  5 
C)  10 
D)  11

Question 4

If a method in a subclass has the same signature as a method in the superclass,the subclass method overloads the superclass method.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A)  ClassA 
B)  ClassB 
C)  ClassC 
D)  Cannot tell 
A)  ClassA 
B)  ClassB 
C)  ClassC 
D)  Cannot tell

Question 6

All methods in an abstract class must also be declared abstract.

Accepted Answer

A) True 
 B)False

Question 7

Every class has a toString method and an equals method inherited from the Object class.

Accepted Answer

A) True 
 B)False

Question 8

All fields declared in an interface

Accepted Answer

A)  are final and static 
B)  have protected access 
C)  must be initialized in the class implementing the interface 
D)  have private access 
A)  are final and static 
B)  have protected access 
C)  must be initialized in the class implementing the interface 
D)  have private access

Question 9

A protected member of a class may be directly accessed by

Accepted Answer

A)  methods of the same class 
B)  methods of a subclass 
C)  methods in the same package 
D)  All of the above. 
A)  methods of the same class 
B)  methods of a subclass 
C)  methods in the same package 
D)  All of the above.

If a class contains an abstract method,

If a subclass constructor does not explicitly call a superclass constructor,

If a method in a subclass has the same signature as a method in the superclass,the subclass method overloads the superclass method.

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

All methods in an abstract class must also be declared abstract.

Every class has a toString method and an equals method inherited from the Object class.

All fields declared in an interface

A protected member of a class may be directly accessed by

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

A First Look at Gui Applications

Arrays and the Arraylist Class

A Second Look at Classes and Objects

Text Processing and More About Wrapper Classes

Exceptions and Advanced File Io

Advanced Gui Applications

Applets and More

Recursion

Sorting, Searching, and Algorithm Analysis

Generics

Collections

Array-Based Lists

Linked Lists

Stacks and Queues

Binary Trees, Avl Trees, and Priority Queues

Filters

Exam 11: Inheritance

If a class contains an abstract method,

If a subclass constructor does not explicitly call a superclass constructor,

If a method in a subclass has the same signature as a method in the superclass,the subclass method overloads the superclass method.

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

All methods in an abstract class must also be declared abstract.

Every class has a toString method and an equals method inherited from the Object class.

All fields declared in an interface

A protected member of a class may be directly accessed by

Introduction to Computers and Java

Java Fundamentals

Decision Structures

Loops and Files

Methods

A First Look at Classes

A First Look at Gui Applications

Arrays and the Arraylist Class

A Second Look at Classes and Objects

Text Processing and More About Wrapper Classes

Exceptions and Advanced File Io

Advanced Gui Applications

Applets and More

Recursion

Sorting, Searching, and Algorithm Analysis

Generics

Collections

Array-Based Lists

Linked Lists

Stacks and Queues

Binary Trees, Avl Trees, and Priority Queues

Filters