What is the Composite Pattern in C++ and Java?

Can you explain the Composite Pattern in C++ and Java?

Sure! The Composite Pattern is a structural design pattern that lets you compose objects into tree structures to represent part-whole hierarchies.

How does it work in C++?

In C++, you typically define a component interface, then create leaf and composite classes that implement this interface. The composite class can hold children and implement methods to manage them.

And what about Java?

In Java, the approach is similar. You define an interface for components, then create concrete classes for leaves and composites. The composite class can contain a list of child components.

Can you give me a simple code example?

Certainly! Here's a basic example in Java:

interface Component {
    void operation();
}

class Leaf implements Component {
    public void operation() {
        System.out.println("Leaf operation");
    }
}

class Composite implements Component {
    private List<Component> children = new ArrayList<>();
    
    public void add(Component component) {
        children.add(component);
    }
    
    public void operation() {
        for (Component child : children) {
            child.operation();
        }
    }
}

This code defines a simple composite structure.