Chapter 11 Inheritance and Polymorphism UPDATED ACTUAL Questions and CORRECT Answers
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Course
Inheritance and Polymorphism
Institution
Inheritance And Polymorphism
Chapter 11 Inheritance and Polymorphism
UPDATED ACTUAL Questions and
CORRECT Answers
Object-oriented programming allows you to derive new classes from existing classes. This is
called ____________.
A. encapsulation
B. inheritance
C. abstraction
D. generalization - CORRECT ANSWER- B. inher...
Chapter 11 Inheritance and Polymorphism
UPDATED ACTUAL Questions and
CORRECT Answers
Object-oriented programming allows you to derive new classes from existing classes. This is
called ____________.
A. encapsulation
B. inheritance
C. abstraction
D. generalization - CORRECT ANSWER✔✔- B. inheritance
Suppose you create a class Square to be a subclass of GeometricObject. Analyze the
following code:
class Square extends GeometricObject {
double length;
} - CORRECT ANSWER✔✔- B. The program has a compile error because you attempted to
invoke the GeometricObject class's constructor illegally.
11.6 What is the output of running class C?
class A {
public A() {
System.out.println(
"The default constructor of A is invoked");
}
}
,class B extends A {
public B() {
System.out.println(
"The default constructor of B is invoked");
}
}
public class C {
public static void main(String[] args) {
B b = new B();
}
} - CORRECT ANSWER✔✔- C. "The default constructor of A is invoked" followed by
"The default constructor of B is invoked"
11.7 Which of the following is incorrect?
A. A constructor may be static.
B. A constructor may be private.
C. A constructor may invoke a static method.
D. A constructor may invoke an overloaded constructor.
E. A constructor invokes its superclass no-arg constructor by default if a constructor does not
invoke an overloaded constructor or its superclass?s constructor. - CORRECT ANSWER✔✔-
A. A constructor may be static.
11.8 Which of the statements regarding the super keyword is incorrect?
A. You can use super to invoke a super class constructor.
B. You can use super to invoke a super class method.
C. You can use super.super.p to invoke a method in superclass's parent class.
D. You cannot invoke a method in superclass's parent class. - CORRECT ANSWER✔✔- C.
You can use super.super.p to invoke a method in superclass's parent class.
, 11.9 Analyze the following code:
public class Test {
public static void main(String[] args) {
B b = new B();
b.m(5);
System.out.println("i is " + b.i);
}
}
class A {
int i;
public void m(int i) {
this.i = i;
}
}
class B extends A {
public void m(String s) {
}
}
A. The program has a compile error, because m is overridden with a different signature in B.
B. The program has a compile error, because b.m(5) cannot be invoked since the method
m(int) is hidden in B.
C. The program has a runtime error on b.i, because i is not accessible from b.
D. The method m is not overridden in B. B inherits the method m from A and defines an
overloaded method m in B. - CORRECT ANSWER✔✔- D. The method m is not overridden
in B. B inherits the method m from A and defines an overloaded method m in B.
11.10 The getValue() method is overridden in two ways. Which one is correct?
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