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Composite java

Composite Design Pattern

Client

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package edu.redwoods.client;

import edu.redwoods.composite.Circle;
import edu.redwoods.composite.Drawing;
import edu.redwoods.composite.Shape;
import edu.redwoods.composite.Triangle;

public class Client {

    public static void main(String[] args) {
        Shape tri = new Triangle();
        Shape tri1 = new Triangle();
        Shape cir = new Circle();

        Drawing drawing = new Drawing();
        drawing.add(tri1);
        drawing.add(tri1);
        drawing.add(cir);

        drawing.draw("Red");

        drawing.clear();

        drawing.add(tri);
        drawing.add(cir);
        drawing.draw("Green");
    }

}

Component

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package edu.redwoods.composite;

public interface Shape {

    public void draw(String fillColor);
}

Leaf Component

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package edu.redwoods.composite;

public class Triangle implements Shape {

    @Override
    public void draw(String fillColor) {
        System.out.println("Drawing Triangle with color "+fillColor);
    }

}

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package edu.redwoods.composite;

public class Circle implements Shape {

    @Override
    public void draw(String fillColor) {
        System.out.println("Drawing Circle with color "+fillColor);
    }

}

Composite Component

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package edu.redwoods.composite;

import java.util.ArrayList;
import java.util.List;

public class Drawing implements Shape{

    //collection of Shapes
    private List<Shape> shapes = new ArrayList<Shape>();

    @Override
    public void draw(String fillColor) {
        for(Shape sh : shapes)
        {
            sh.draw(fillColor);
        }
    }

    //adding shape to drawing
    public void add(Shape s){
        this.shapes.add(s);
    }

    //removing shape from drawing
    public void remove(Shape s){
        shapes.remove(s);
    }

    //removing all the shapes
    public void clear(){
        System.out.println("Clearing all the shapes from drawing");
        this.shapes.clear();
    }
}