How do I implement the Composite Pattern in my code?

How do I implement the Composite Pattern in my code?

The Composite Pattern is a structural design pattern that lets you compose objects into tree structures. It allows clients to treat individual objects and compositions uniformly. Would you like a code example?

Yes, please provide a code example in Java.

Sure! Here's a simple example:

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

// Component
interface Graphic {
    void draw();
}

// Leaf
class Circle implements Graphic {
    public void draw() {
        System.out.println("Drawing a Circle");
    }
}

// Leaf
class Square implements Graphic {
    public void draw() {
        System.out.println("Drawing a Square");
    }
}

// Composite
class CompositeGraphic implements Graphic {
    private List<Graphic> graphics = new ArrayList<>();

    public void add(Graphic graphic) {
        graphics.add(graphic);
    }

    public void draw() {
        for (Graphic graphic : graphics) {
            graphic.draw();
        }
    }
}

// Client
public class Main {
    public static void main(String[] args) {
        CompositeGraphic composite = new CompositeGraphic();
        composite.add(new Circle());
        composite.add(new Square());
        composite.draw();
    }
}

This code demonstrates how to create a composite structure of graphics.

What are the benefits of using the Composite Pattern?

The Composite Pattern simplifies client code by allowing clients to treat individual objects and compositions uniformly. It also promotes flexibility in adding new components without changing existing code.