Computer Science › Class Inheritance
What does the code print?
class Parent{
final public void show() {
`` System.out.println( "Parent::show() called" );
`` }
}
``
class Child extends Parent {
`` public void show() {
`` System.out.println( "Child::show() called" );
`` }
}
``
public class Main {
`` public static void main(String[] args) {
Parent parent = new Child();
parent .show();
`` }
}
True or False.
The class BetterMan inherits from the class Man.
public class BetterMan extends Man {
}
Consider the following code:
public class Rectangle {
private double width, height;
public Rectangle(double w,double h) {
width = w;
height = h;
}
``
public double getArea() {
return width * height;
}
``
public double getPerimeter() {
return 2 * width + 2 * height;
}
}
``
public class Square {
private double side;
public Square(double s) {
side = s;
}
public double getArea() {
return side * side;
}
public double getPerimeter() {
return 4 * side;
}
}
Which of the following represents a redefinition of Square that utilizes the benefits of inheritance?
class Z
{
public:
void Func4();
};
class Y : public Z
{
public:
virtual void Func3();
};
class B : public Y
public:
virtual void Func1();
void Func2();
};
class C : public B
public:
virtual void Func1();
};
What is the base class in the above code.
class Member{
public:
Member() { cout<< 1 ; }
};
class Base{
public:
Base(){ cout<< 1; }
Memeber member;
};
class Derived : public Base{
public:
Derived(){ cout << 3; }
};
int main(){
Derived der;
}
Given the code above, what is the output of the program?
class Pet {
public:
Pet() {}
virtual void bar() {cout << "In pet bar(); }
};
class Cat : public Pet {
public:
virtual void eat() {cout << "Cat eating"; }
virtual void bar() {cout << "In Cat bar()"; }
};
Given the above classes, what would the result of:
int main(){
Pet * petPtr = new Cat();
petPtr -> eat();
}
class Pet {
public:
Pet() {}
virtual void bar() {cout << "In pet bar(); }
};
class Cat : public Pet {
public:
virtual void eat() {cout << "Cat eating"; }
virtual void bar() {cout << "In Cat bar()"; }
};
Given the above classes, what would the result of:
int main(){
Cat felix;
Pet peeve;
peeve = felix;
peeve.bar();
}
Consider the following code:
private static class Philosopher {
private String name;
private String favoriteSubject;
public Philosopher(String n, String f) {
name = n;
favoriteSubject = f;
}
public String getName() {
return name;
}
public String getFavoriteSubject() {
return favoriteSubject;
}
public void speak() {
System.out.println("Hello, World! My name is "+name + ". My favorite subject is "+favoriteSubject);
}
}
private static class Nominalist extends Philosopher {
boolean franciscan;
public Nominalist(String n,boolean frank) {
super(n,"logic");
franciscan = frank;
}
public void speak() {
super.speak();
if(franciscan) {
System.out.println("I am a Franciscan");
} else {
System.out.println("I am not a Franciscan");
}
}
public String whoMightHaveTaughtMe() {
if(franciscan) {
return "Perhaps William of Ockham?....";
} else {
return "Perhaps it was Durandus of St. Pourçain — scandalous, a Dominican nominalist!";
}
}
}
public static void main(String\[\] args) {
Philosopher\[\] phils = {
new Philosopher("Petrus","Ethics"),
new Nominalist("Minimus Maximus",false),
new Nominalist("Theodoric",true)};
for(int i = 0; i < phils.length; i++) {
phils\[i\].speak();
}
}
What is the output for the code above?
Which of the following is TRUE about the Object class?
For this question, consider the following code:
private static class Philosopher {
private String name;
private String favoriteSubject;
public Philosopher(String n, String f) {
name = n;
favoriteSubject = f;
}
public String getName() {
return name;
}
public String getFavoriteSubject() {
return favoriteSubject;
}
public void speak() {
System.out.println("Hello, World! My name is "+name + ". My favorite subject is "+favoriteSubject);
}
}
private static class Nominalist extends Philosopher {
boolean franciscan;
public Nominalist(String n,boolean frank) {
super(n,"logic");
franciscan = frank;
}
public void speak() {
super.speak();
if(franciscan) {
System.out.println("I am a Franciscan");
} else {
System.out.println("I am not a Franciscan");
}
}
public String whoMightHaveTaughtMe() {
if(franciscan) {
return "Perhaps William of Ockham?....";
} else {
return "Perhaps it was Durandus of St. Pourçain — scandalous, a Dominican nominalist!";
}
}
}
public static void main(String\[\] args) {
Philosopher p = new Nominalist("Nicanor",false);
System.out.println(p.whoMightHaveTaughtMe());
}
What is the output for this main method?