Question 1

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.E) B) and C)
F) A) and D)

Question 2

This is a special type of expression used to create an object that implements a functional interface.

Accepted Answer

A)   lambda
B)   beta
C)   alpha
D)   sigmaE) A) and D)
F) C) and D)

Question 3

Like a family tree, a ________ shows the inheritance relationship between classes.

Accepted Answer

A)   flowchart
B)   class map
C)   class hierarchy
D)   binary treeE) B) and D)
F) C) and D)

Question 4

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 as a result of the following statements?
ClassB 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.E) A) and B)
F) A) and C)

Question 5

The super statement that calls the superclass constructor:

Accepted Answer

A)   must be the first statement in the superclass's constructor
B)   can appear in any method of the subclass
C)   must be the first statement in the subclass's constructor
D)   is deprecated and is no longer supported in newer versions of JavaE) B) and C)
F) A) and B)

Question 6

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 tellE) All of the above
F) B) and C)

Question 7

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

Accepted Answer

A)   some of the characteristics of the general class, but not all, plus additional characteristics
B)   some of the characteristics of the general object, but not all
C)   none of the characteristics of the general object
D)   all the characteristics of the general object, plus additional characteristicsE) B) and C)
F) A) and D)

Question 8

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 SalariedE) None of the above
F) A) and C)

Question 9

An anonymous inner class must:

Accepted Answer

A)   implement an interface
B)   extend another class
C)   either A or B
D)   both A and BE) A) and C)
F) A) and D)

Question 10

Which of the following is an example of a lambda expression?

Accepted Answer

A)   int x = x * factor;
B)   IntCalculator = new divider(x, 2) ;
C)   IntCalculator multiplier = x -> x * factor;
D)   All of the aboveE) B) and D)
F) A) and C)

Question 11

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 method1 will be executed when the following statements are executed?
ClassA item1 = new ClassB() ;
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.E) A) and C)
F) B) and C)

Question 12

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 Interface3E) All of the above
F) A) and B)

Question 13

Protected members are:

Accepted Answer

A)   not quite private
B)   not quite public
C)   both A and B
D)   neither A nor BE) A) and C)
F) C) and D)

Question 14

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 aboveE) A) and D)
F) A) and B)

Question 15

If a class contains an abstract method:

Accepted Answer

A)   you must 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 cannot be overridden in subclasses
D)   All of the above.E) B) and C)
F) None of the above

Question 16

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)   11E) All of the above
F) C) and D)

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

A functional interface is simply an interface that has one abstract method.

Accepted Answer

A) True 
 B)False

Question 19

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)   9E) B) and C)
F) None of the above

Question 20

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 accessE) C) and D)
F) B) and D)

Exam 10: Inheritance

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.") ; } }

Correct Answer
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A functional interface is simply an interface that has one abstract method.

Correct Answer
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If a class contains an abstract method:

Correct Answer
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The super statement that calls the superclass constructor:

Correct Answer
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Correct Answer
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If a class contains an abstract method:

Correct Answer
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Which of the following statements correctly specifies three interfaces?

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

Correct Answer
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Like a family tree, a ________ shows the inheritance relationship between classes.

Correct Answer
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In the following statement, which is the superclass? Public class ClassA extends ClassB implements ClassC

Correct Answer
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Which of the following is an example of a lambda expression?

Correct Answer
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Correct Answer
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All fields declared in an interface:

Correct Answer
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This is a special type of expression used to create an object that implements a functional interface.

Correct Answer
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Protected members are:

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

Correct Answer
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An anonymous inner class must:

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

Correct Answer
verified

Exam 10: Inheritance

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.") ; } }

Correct AnswerverifiedShow Answer

A functional interface is simply an interface that has one abstract method.

Correct AnswerverifiedShow Answer

If a class contains an abstract method:

Correct AnswerverifiedShow Answer

The super statement that calls the superclass constructor:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

If a class contains an abstract method:

Correct AnswerverifiedShow Answer

Which of the following statements correctly specifies three interfaces?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Like a family tree, a ________ shows the inheritance relationship between classes.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is an example of a lambda expression?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

All fields declared in an interface:

Correct AnswerverifiedShow Answer

This is a special type of expression used to create an object that implements a functional interface.

Correct AnswerverifiedShow Answer

Protected members are:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An anonymous inner class must:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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