Question 1

When declaring class data members,it is best to declare them as

Accepted Answer

A)  private members 
B)  public members 
C)  protected members 
D)  restricted members 
A)  private members 
B)  public members 
C)  protected members 
D)  restricted members

Question 2

In an inheritance relationship,the subclass constructor always executes before the superclass constructor.

Accepted Answer

A) True 
 B)False

Question 3

Protected members are

Accepted Answer

A)  not quite private 
B)  not quite public 
C)  Both A and B 
D)  Neither A or B 
A)  not quite private 
B)  not quite public 
C)  Both A and B 
D)  Neither A or B

Question 4

Look at the following code. Line 1 public class ClassA
Line 2 {
Line 3 public ClassA(){}
Line 4 public void method1(){}
Line 5 }
Line 6 public class ClassB extends ClassA
Line 7 {
Line 8 public ClassB(){}
Line 9 public void method1(){}
Line 10 }
Line 11 public class ClassC extends ClassB
Line 12 {
Line 13 public ClassC(){}
Line 14 public void method1(){}
Line 15 }
Which method1 will be executed as a result of the following statements?
ClassA item1 = new ClassC();
Item1.method1();

Accepted Answer

A)  Line 4 
B)  Line 9 
C)  Line 14 
D)  This is an error and will cause the program to crash 
A)  Line 4 
B)  Line 9 
C)  Line 14 
D)  This is an error and will cause the program to crash

Question 5

What is wrong with the following code? public class ClassB extends ClassA
{
Public ClassB()
{
Super(40);
System.out.println("This is the last statement " +
"in the constructor.");
}
}

Accepted Answer

A)  Nothing is wrong with the code 
B)  The method super is not defined 
C)  The call to the method super must be the first statement in the constructor 
D)  No values may be passed to super 
A)  Nothing is wrong with the code 
B)  The method super is not defined 
C)  The call to the method super must be the first statement in the constructor 
D)  No values may be passed to super

Question 6

Look at the following code.Which line in ClassA has an error: Line 1 public interface MyInterface
Line 2 {
Line 3 int FIELDA = 55;
Line 4 public int methodA(double);
Line 5 }
Line 6 public class ClassA implements MyInterface
Line 7 {
Line 8 FIELDA = 60;
Line 9 public int methodA(double){ }
Line 10 }

Accepted Answer

A)  6 
B)  7 
C)  8 
D)  9 
A)  6 
B)  7 
C)  8 
D)  9

Question 7

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

Accepted Answer

A)  "has a" 
B)  "is a" 
C)  direct 
D)  "contains a" 
A)  "has a" 
B)  "is a" 
C)  direct 
D)  "contains a"

Question 8

It is not possible for a superclass to call a subclass's method.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following statements declares Salaried as a subclass of PayType?

Accepted Answer

A)  public class Salaried extends PayType 
B)  public class Salaried implements PayType 
C)  public class Salaried derivedFrom(Paytype) 
D)  public class PayType derives Salaried 
A)  public class Salaried extends PayType 
B)  public class Salaried implements PayType 
C)  public class Salaried derivedFrom(Paytype) 
D)  public class PayType derives Salaried

Question 10

Look at the following code.The method in line _______ will override the method in line _______. Line 1 public class ClassA
Line 2 {
Line 3 public ClassA(){}
Line 4 public int method1(int a){}
Line 5 public double method2(int b){}
Line 6 }
Line 7 public ClassB extends ClassA
Line 8 {
Line 9 public ClassB(){}
Line 10 public int method1(int b,int c){}
Line 11 public double method2(double c){}
Line 12 }

Accepted Answer

A)  10,4 
B)  11,5 
C)  Both a and b 
D)  None of the above 
A)  10,4 
B)  11,5 
C)  Both a and b 
D)  None of the above

Question 11

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

Accepted Answer

A)  ClassA must override each method in ClassB 
B)  ClassB must override each method in ClassA 
C)  ClassB inherits from ClassA 
D)  ClassA inherits from ClassB 
A)  ClassA must override each method in ClassB 
B)  ClassB must override each method in ClassA 
C)  ClassB inherits from ClassA 
D)  ClassA inherits from ClassB

Question 12

Look at the following code. Line 1 public class ClassA
Line 2 {
Line 3 public ClassA(){}
Line 4 public void method1(int a){}
Line 5 }
Line 6 public class ClassB extends ClassA
Line 7 {
Line 8 public ClassB(){}
Line 9 public void method1(){}
Line 10 }
Line 11 public class ClassC extends ClassB
Line 12 {
Line 13 public ClassC(){}
Line 14 public void method1(){}
Line 15 }
Which method will be executed when the following statements are executed?
ClassC item1 = new ClassA();
Item1.method1();

Accepted Answer

A)  Line 4 
B)  Line 9 
C)  Line 14 
D)  This is an error and will cause the program to crash. 
A)  Line 4 
B)  Line 9 
C)  Line 14 
D)  This is an error and will cause the program to crash.

Question 13

Look at the following code.What is missing from ClassA? Line 1 public interface MyInterface
Line 2 {
Line 3 int FIELDA = 55;
Line 4 public int methodA(double);
Line 5 }
Line 6 public class ClassA implements MyInterface
Line 7 {
Line 8 FIELDA = 60;
Line 9 public int methodB(double){ }
Line 10 }

Accepted Answer

A)  It does not override methodA. 
B)  It does not have a constructor. 
C)  It does not overload methodA. 
D)  Nothing is missing.It is a complete class. 
A)  It does not override methodA. 
B)  It does not have a constructor. 
C)  It does not overload methodA. 
D)  Nothing is missing.It is a complete class.

Question 14

If a superclass does not have a default constructor or a no-arg constructor,

Accepted Answer

A)  then a class that inherits from it,must initialize the superclass values. 
B)  then a class that inherits from it,must call one of the constructors that the superclass does have. 
C)  then a class that inherits from it,does not inherit the data member fields from the superclass. 
D)  then a class that inherits from it,must contain the default constructor for the superclass. 
A)  then a class that inherits from it,must initialize the superclass values. 
B)  then a class that inherits from it,must call one of the constructors that the superclass does have. 
C)  then a class that inherits from it,does not inherit the data member fields from the superclass. 
D)  then a class that inherits from it,must contain the default constructor for the superclass.

Question 15

Which of the following statements correctly specifies three interfaces:

Accepted Answer

A)  public class ClassA implements Interface1,Interface2,Interface3 
B)  public class ClassA implements [Interface1,Interface2,Interface3] 
C)  public class ClassA implements (Interface1,Interface2,Interface3) 
D)  public class ClassA implements Interface1 Interface2 Interface3 
A)  public class ClassA implements Interface1,Interface2,Interface3 
B)  public class ClassA implements [Interface1,Interface2,Interface3] 
C)  public class ClassA implements (Interface1,Interface2,Interface3) 
D)  public class ClassA implements Interface1 Interface2 Interface3

Question 16

In the following statement,which is the superclass? 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 17

Look at the following code.Which line has an error? Line 1 public interface Interface1
Line 2 {
Line 3 int FIELDA = 55;
Line 4 public int methodA(double){}
Line 5 }

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 18

In a class hierachy

Accepted Answer

A)  the more general classes are toward the bottom of the tree and the more specialized are toward the top. 
B)  the more general classes are toward the top of the tree and the more specialized are toward the bottom. 
C)  the more general classes are toward the left of the tree and the more specialized are toward the right. 
D)  the more general classes are toward the right of the tree and the more specialized are toward the left. 
A)  the more general classes are toward the bottom of the tree and the more specialized are toward the top. 
B)  the more general classes are toward the top of the tree and the more specialized are toward the bottom. 
C)  the more general classes are toward the left of the tree and the more specialized are toward the right. 
D)  the more general classes are toward the right of the tree and the more specialized are toward the left.

Question 19

What is wrong with the following code? public class ClassB extends ClassA
{
Public ClassB()
{
Int init = 10;
Super(40);
}
}

Accepted Answer

A)  Nothing is wrong with the code. 
B)  The method super is not defined. 
C)  The call to the method super must be the first statement in the constructor. 
D)  No values may be passed to super. 
A)  Nothing is wrong with the code. 
B)  The method super is not defined. 
C)  The call to the method super must be the first statement in the constructor. 
D)  No values may be passed to super.

Question 20

In an interface all methods have

Accepted Answer

A)  private access 
B)  protected access 
C)  public access 
D)  packaged access 
A)  private access 
B)  protected access 
C)  public access 
D)  packaged access

When declaring class data members,it is best to declare them as

In an inheritance relationship,the subclass constructor always executes before the superclass constructor.

Protected members are

What is wrong with the following code? public class ClassB extends ClassA { Public ClassB() { Super(40); System.out.println("This is the last statement " + "in the constructor."); } }

Look at the following code.Which line in ClassA has an error: Line 1 public interface MyInterface Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double); Line 5 } Line 6 public class ClassA implements MyInterface Line 7 { Line 8 FIELDA = 60; Line 9 public int methodA(double){ } Line 10 }

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

It is not possible for a superclass to call a subclass's method.

Which of the following statements declares Salaried as a subclass of PayType?

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

Look at the following code.What is missing from ClassA? Line 1 public interface MyInterface Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double); Line 5 } Line 6 public class ClassA implements MyInterface Line 7 { Line 8 FIELDA = 60; Line 9 public int methodB(double){ } Line 10 }

If a superclass does not have a default constructor or a no-arg constructor,

Which of the following statements correctly specifies three interfaces:

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

Look at the following code.Which line has an error? Line 1 public interface Interface1 Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double){} Line 5 }

In a class hierachy

What is wrong with the following code? public class ClassB extends ClassA { Public ClassB() { Int init = 10; Super(40); } }

In an interface all methods have

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

When declaring class data members,it is best to declare them as

In an inheritance relationship,the subclass constructor always executes before the superclass constructor.

Protected members are

What is wrong with the following code? public class ClassB extends ClassA { Public ClassB() { Super(40); System.out.println("This is the last statement " + "in the constructor."); } }

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

It is not possible for a superclass to call a subclass's method.

Which of the following statements declares Salaried as a subclass of PayType?

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

Look at the following code.What is missing from ClassA? Line 1 public interface MyInterface Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double); Line 5 } Line 6 public class ClassA implements MyInterface Line 7 { Line 8 FIELDA = 60; Line 9 public int methodB(double){ } Line 10 }

If a superclass does not have a default constructor or a no-arg constructor,

Which of the following statements correctly specifies three interfaces:

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

Look at the following code.Which line has an error? Line 1 public interface Interface1 Line 2 { Line 3 int FIELDA = 55; Line 4 public int methodA(double){} Line 5 }

In a class hierachy

What is wrong with the following code? public class ClassB extends ClassA { Public ClassB() { Int init = 10; Super(40); } }

In an interface all methods have

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