Define Facade design Pattern and write an example in java
Facade Design Pattern comes under Structural Design Pattern and is used to hide the complexity and logic of the system from the client and only provides an interface for a client to access the system.
package p1;
public interface Shape
{
public void draw();
}
package p1;
public class Rectangle implements Shape
{
public void draw()
{
System.out.println("Draw Rectangle");
}
}
package p1;
public class Square implements Shape
{
public void draw()
{
System.out.println("Draw Square");
}
}
package p1;
public class Circle implements Shape
{
public void draw()
{
System.out.println("Draw Circle");
}
}
package p1;
public class ShapeMaker
{
private Shape circle;
private Shape rectangle;
private Shape square;
public ShapeMaker()
{
circle=new Circle();
rectangle=new Rectangle();
square=new Square();
}
public void drawCircle()
{
circle.draw();
}
public void drawRectangle()
{
rectangle.draw();
}
public void drawSquare()
{
square.draw();
}
}
package p1;
public class FacadePattern
{
public static void main(String[] args)
{
ShapeMaker ob=new ShapeMaker();
ob.drawCircle();
ob.drawRectangle();
ob.drawSquare();
}
}
