4. The following statements are marked as legal or illegal: a. Vehicle v = new Car(); // legal // legal // legal // legal // illegal // illegal b. Vehicle v = c. Car c = new SUV(); d. SUV s = new SUV(); e. SUV s = new Car(); f. Car c = new Vehicle(); new SUV ( ) ; public class Vehicle {...} public class Car extends Vehicle {...} public class SUV extends Car {...}

1. class rectangle { private: double width; double length; 3. 4. public: rectangle(double w=0.0, double l=0.0) { width=w; 5. б. 7. length=w; } void operator++() //prefix ++ operator 10. {++width; ++length; } 11. void operator++() //postfix ++ operator 12. {width++; length++; } 8. 9. 13. }; Which line of the above C++ code contains an error? Select one: a.9 b.6 c.No errors d.11

There is a class hierarchy that includes three classes: class Animal {    protected int age;    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }}class Pet extends Animal {    protected String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}class Cat extends Pet {        protected String color;    public String getColor() {        return color;    }    public void setColor(String color) {        this.color = color;    }} Given the following object: Pet cat = new Cat(); Select all invalid method invocations.

49. Consider the following class definition. public class Cylinder } private double baseRadius; private double height; public Cylinder () baseRadius = 0; height = 0; public Cylinder (double 1, double h) } baseRadius - 1; height = h; { public void set (double r, double h) } baseRadius = r; height = h; { public String toString () } return (baseRadius + It n + height); { public double SurfaceArea () return 2 * 3.14 * baseRadius height; public double volume () } return 3.14 baseRadius * baseRadius * height; { Which of the following statements correctly instantiates the Cylinder object myCylinder? (i) Cylinder mycylinder = new Cylinder (2.5, 7.3) : (ii) class Cylinder myCylinder = new Cylinder (2.5, 7.3); (ii) myCylinder new Cylinder (2.5, 7.3); %3D a. Only (i) b. Only (i) c. Only (iüi) d. Both (ii) and (ii)

2. Consider the following class definitions: public class BClass } private int x; public void set(int a) } X a; { public void print() } System.out.print(x); { { public class DClass extends BClass } private int y; public void set(int a, int b) } //Postcondition: x =a; y=Db; { public void print( ) {.…} a. Write the definition of the print method of DClass that overrides it. b. Write the definition of the method set of the class DClass.

public class Father { public String name; public int age; // customer name Father(){ name=”Hassan”; age=50;} public void display(){ System.out.println(“Name:”+name);                                       System.out.println(“Age:”+age); } } 1. Based on Figure 3, create a class named Child that inherits the Father class. Declare an instance name location (String) for class Child. 2. Define a constructor in class Child and give an appropriate initial values for the instance (name, age, location). 3. Define a method display () in class Child, execute the display ( ) method in superclass using the keyword super. Method display ( ) in class Child should print the information of name, age and location 4. Create other class named Main for the main method and create 2 objects for the 2 classes (Father and Child). Then execute the display ( ) method for Father and Child. Example of the output as in Figure 4: Father's info:  Name: Josh Age: 50 Child's info: Name: Christy Age: 20 Location:…

public class Cat extends Pet {   private String breed;    public void setBreed(String userBreed) {      breed = userBreed;   }    public String getBreed() {      return breed;   }} public class Pet {    protected String name;   protected int age;    public void setName(String userName) {      name = userName;   }    public String getName() {      return name;   }    public void setAge(int userAge) {      age = userAge;   }    public int getAge() {      return age;   }    public void printInfo() {      System.out.println("Pet Information: ");      System.out.println("   Name: " + name);      System.out.println("   Age: " + age);   } } import java.util.Scanner; public class PetInformation {   public static void main(String[] args) {        Scanner scnr = new Scanner(System.in);         // create a generic Pet and a Cat        Pet myPet = new Pet();        Cat myCat = new Cat();         // declare variables for pet and cat info        String petName, catName, catBreed;        int petAge,…

Design a new Triangle class that extends the abstract GeometricObject class: Draw the UML diagram for the classes Triangle and GeometricObject Implement the Triangle class Write a test program that prompts the user to enter three sides of the triangle, a color, and a Boolean value to indicate whether the triangle is filled: The program should create a Triangle object with these sides and set the color and filled properties using the input The program should display the area, perimeter, color, and true or false to indicate whether it is filled or not

class A{ void methodA(){} void methodB(); } class B extends A{ void methodA(){ } } class A should be abstract methodB should be abstract both a and b both classes are okay

For the following four classes, choose the correct relationship between each pair. public class Room ( private String m type; private double m area; // "Bedroom", "Dining room", etc. // in square feet public Room (String type, double area) m type type; m area = area; public class Person { private String m name; private int m age; public Person (String name, int age) m name = name; m age = age; public class LivingSSpace ( private String m address; private Room[] m rooms; private Person[] m occupants; private int m countRooms; private int m countoccupants; public LivingSpace (String address, int numRooms, int numoccupants) m address = address; new int [numRooms]; = new int [numOceupants]; m rooms %3D D occupants m countRooms = m countOccupants = 0; public void addRoom (String type, double area)