Click here to watch in Youtube : https://www.youtube.com/watch?v=SKZQx1DdA9U
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| Flyweight Design pattern - Implementation |
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| Flyweight Design pattern - Class Diagram |
Shape.java
public interface Shape
{
void draw();
}
Circle.java
public class Circle implements Shape
{
private String color;
private final int x = 10;
private final int y = 20;
private final int radius = 30;
public Circle()
{
}
public Circle( String color )
{
this.color = color;
}
public String getColor()
{
return color;
}
public void setColor( String color )
{
this.color = color;
}
@Override
public void draw()
{
System.out.println(this+" : Circle: Draw() [Color : " + color + ", x : " + x + ", y :" + y + ", radius :"
+ radius);
}
}
ShapeFactory.java
import java.util.HashMap;
public class ShapeFactory
{
private static final HashMap<String, Shape> shapeMap = new HashMap<String, Shape>();
public static Shape getShape( String shapeType )
{
Shape shape=null;
if( shapeType.equalsIgnoreCase("circle") )
{
shape = (Circle) shapeMap.get("circle");
if( shape == null )
{
shape = new Circle();
shapeMap.put("circle", shape);
System.out.println("Creating circle object with out any color in shapefactory : " + shape
+ "\n");
}
}
return shape;
}
}
FlyweightPatternDemo.java
public class FlyweightPatternDemo
{
private static final String colors[] = { "Red", "Green", "Blue", "Orange", "Black" };
public static void main( String[] args )
{
System.out.println("\n################ Red color Circles ####################");
for( int i = 0; i < 10; ++i )
{
Circle circle = (Circle) ShapeFactory.getShape("circle");
circle.setColor(colors[0]);
circle.draw();
}
System.out.println("\n############### Green color Circles ####################");
for( int i = 0; i < 10; ++i )
{
Circle circle = (Circle) ShapeFactory.getShape("circle");
circle.setColor(colors[1]);
circle.draw();
}
System.out.println("\n################ Blue color Circles ####################");
for( int i = 0; i < 10; ++i )
{
Circle circle = (Circle) ShapeFactory.getShape("circle");
circle.setColor(colors[2]);
circle.draw();
}
System.out.println("\n################ Orange color Circles ####################");
for( int i = 0; i < 10; ++i )
{
Circle circle = (Circle) ShapeFactory.getShape("circle");
circle.setColor(colors[3]);
circle.draw();
}
System.out.println("\n################ Black color Circles ####################");
for( int i = 0; i < 10; ++i )
{
Circle circle = (Circle) ShapeFactory.getShape("circle");
circle.setColor(colors[4]);
circle.draw();
}
}
}
Output
################ Red color Circles ####################
Creating circle object with out any color in shapefactory : Circle@10385c1
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Red, x : 10, y :20, radius :30
############### Green color Circles ####################
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Green, x : 10, y :20, radius :30
################ Blue color Circles ####################
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Blue, x : 10, y :20, radius :30
################ Orange color Circles ####################
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Orange, x : 10, y :20, radius :30
################ Black color Circles ####################
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
Circle@10385c1 : Circle: Draw() [Color : Black, x : 10, y :20, radius :30
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