Override Methods - Java
Authored by Ayesha Abdullah
Computers
12th Grade
Used 115+ times
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4 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Consider the following class definitions.
public class Apple
{
public void printColor()
{
System.out.print("Red");
}
}
public class GrannySmith extends Apple
{
public void printColor()
{
System.out.print("Green");
}
}
public class Jonagold extends Apple
{
// no methods defined
}
The following statement appears in a method in another class.
someApple.printColor();
Under which of the following conditions will the statement print "Red" ?
I. When someApple is an object of type Apple
II. When someApple is an object of type GrannySmith
III. When someApple is an object of type Jonagold
I only
II only
I and III only
II and III only
I, II, and III
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Consider the following class definitions.
public class Pet
{
public void speak()
{
System.out.print("pet sound");
}
}
public class Dog extends Pet
{
public void bark()
{
System.out.print("woof woof");
}
public void speak()
{
bark();
}
}
public class Cat extends Pet
{
public void speak()
{
System.out.print("meow meow");
}
}
The following statement appears in a method in another class.
myPet.speak();
Under which of the following conditions will the statement compile and run without error?
I. When myPet is an object of type Pet
II. When myPet is an object of type Dog
III. When myPet is an object of type Cat
I only
II only
I and III only
II and III only
I, II, and III
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Consider the following class definitions.
public class Hero
{
private String name;
private int power;
public Hero(String n, int p)
{
name = n;
power = p;
}
public void powerUp(int p)
{
power += p;
}
public int showPower()
{ return power; }
}
public class SuperHero extends Hero
{
public SuperHero(String n, int p)
{
super(n, p);
}
public void powerUp(int p)
{
super.powerUp(p * 2);
}
}
The following code segment appears in a class other than Hero and SuperHero.
Hero j = new SuperHero("JavaHero", 50);
j.powerUp(10);
System.out.println(j.showPower());
What is printed as a result of executing the code segment?
10
20
60
70
100
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Consider the following class definitions.
public class Drink
{
// implementation not shown
}
public class Coffee extends Drink
{
// There may be instance variables and constructors that are not shown.
// No methods are defined for this class.
}
The following code segment appears in a method in a class other than Drink or Coffee.
Coffee myCup = new Coffee();
myCup.setSize("large");
Which of the following must be true so that the code segment will compile without error?
The Drink class must have a public method named getSize that takes a String value as its parameter.
The Drink class must have a public method named getSize that takes no parameters.
The Drink class must have a public method named setSize that takes a String value as its parameter.
The Drink class must have a public method named setSize that takes no parameters.
The Drink class must have a String instance variable named size.
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