Muhammad al-xorazmiy nomidagi toshkent axborot texnologiyalari universiteti “dif” fakulteti “atdt” kafedrasi

Interfeys yarating.


Shape.java
public interface Shape {
void draw();
}


Create concrete classes implementing the same interface.
Rectangle.java
public class Rectangle implements Shape {

@Override

public void draw() {
System.out.println("Inside Rectangle::draw() method.");
}
}
Square.java
public class Square implements Shape {

@Override

public void draw() {
System.out.println("Inside Square::draw() method.");
}
}
Circle.java
public class Circle implements Shape {

@Override

public void draw() {
System.out.println("Inside Circle::draw() method.");
}
}

Create a Factory to generate object of concrete class based on given information.
ShapeFactory.java
public class ShapeFactory {

//use getShape method to get object of type shape

public Shape getShape(String shapeType){
if(shapeType == null){
return null;
}
if(shapeType.equalsIgnoreCase("CIRCLE")){
return new Circle();

} else if(shapeType.equalsIgnoreCase("RECTANGLE")){

return new Rectangle();

} else if(shapeType.equalsIgnoreCase("SQUARE")){

return new Square();
}

return null;

}
}


Use the Factory to get object of concrete class by passing an information such as type.
FactoryPatternDemo.java
public class FactoryPatternDemo {

public static void main(String[] args) {

ShapeFactory shapeFactory = new ShapeFactory();

//get an object of Circle and call its draw method.

Shape shape1 = shapeFactory.getShape("CIRCLE");

//call draw method of Circle

shape1.draw();

//get an object of Rectangle and call its draw method.

Shape shape2 = shapeFactory.getShape("RECTANGLE");

//call draw method of Rectangle

shape2.draw();

//get an object of Square and call its draw method.

Shape shape3 = shapeFactory.getShape("SQUARE");

//call draw method of square

shape3.draw();
}
}

Verify the output.

Inside Circle::draw() method.

Inside Rectangle::draw() method.
Inside Square::draw() method.