1) Shapes, Triangle and Circle:
A. Create a class named Shapes with the following attributes and methods:
1. A string attribute name
2. A constructor to initialize the attribute
3. A method named printArea() which prints the message “The formula
for area of shape”.
B. Create a class named Triangle which inherits from the Shapes class. The class
has the following attributes and methods:
1. A double attributes base and height.
2. A constructor to initialize the attributes
3. Override a method named printArea() which prints the area of
Triangle which calculates as "0.5 * base * height ".
C. Create a class named Circle which inherits from the Shapes class. The class has
the following attributes and methods:
1. A double attributes radius.
2. A constructor to initialize the attributes
3. Override a method named printArea() which prints the area of Circle
which calculates as "3.14 * radius * radius".
D. In the main method create three objects of type Shapes and call the method
printArea() polymorphically.
class Shapes {
String name;
public Shapes(String n){
name=n;
}
public void printArea() {
System.out.println("The formula for area");
}
}
class Triangle extends Shapes {
double base;
double height;
public Triangle(String n,double b, double h){
super(n);
base=b;
height=h;
}
public void printArea() {
double a=0.5*base*height;
System.out.println("Area of a triangle is: "+a);
}
}
class Circle extends Shapes {
double radius;
public Circle(String n,double r){
super(n);
radius=r;
}
public void printArea() {
double a=3.14 * radius * radius;
System.out.println("Area of a Circle is: "+a);
}
}
public class ShapesTest {
public static void main(String[] args) {
Shapes s1=new Shapes("General Shape");
Shapes s2=new Triangle("Triangle",1,2);
Shapes s3=new Circle("Circle",1);
s1.printArea();
s2.printArea();
s3.printArea();
}
}
2) Cities, Tabuk and Madinah:
A. Create a class named Cities which has the following attributes and methods:
1. A public string attribute location.
2. A constructor to initialize the attribute
3. A void method named print() which print the message "Location is:"
and the value of the attribute location
B. Create a class named Tabuk which inherits from the class cities and has the
following attributes and methods:
1. A public string attribute famousFor
2. A constructor to initialize the attributes
3. Override the method print() so it prints two message "Location is:"
and the value of the attribute location, and “Famous For:” and the
value of the attribute famousFor.
C. Create a class named Madinah which inherits from the class cities and has the
following attributes and methods:
1. A public string attribute famousFor
2. A constructor to initialize the attributes
3. Override the method print() so it prints two message "Location is:"
and the value of the attribute location, and “Famous For:” and the
value of the attribute famousFor.
D. Create an application with the main method and create 3 objects and call the
method print() polymorphically.
Answer:
class Cities{
public String location;
public Cities(String lo){
location=lo;
}
public void print(){
System.out.println("Location is:"+location );
}
}
class Tabuk extends Cities {
String famousOf;
public Tabuk(String lo, String f) {
super(lo);
famousOf=f;
}
public void print( ){
System.out.println("Location is: Tabuk");
System.out.println("Famous for: "+famousOf);
}
}
class Makkah extends Cities {
String famousOf;
public Makkah(String lo, String f) {
super(lo);
famousOf=f;
}
public void print( ){
System.out.println("Location is: Makkah");
System.out.println("Famous for: "+famousOf);
}
}
public class CitiesTest {
public static void main(String[] args) {
Cities obj1=new Cities("Saudi Arabia Cities");
Cities obj2=new Makkah("Makkah","Alkabah");
Cities obj3=new Tabuk("Tabuk","Madian Saleh");
obj1.print();
obj2.print();
obj3.print();
}
}
