Bridge Pattern

1. Definition

Suitable for class hierarchies that vary along multiple dimensions.

2. UML

3. Java

3.1. Client

public class Client
{
    public static void main(String[] args)
    {
        // Create a Lenovo laptop
        Computer computer = new Laptop(new Lenovo());
        computer.sale();
    }
}

3.2. Dimension 1

public interface Brand
{
    void sale();
}

public class Dell implements Brand
{

    @Override
    public void sale()
    {
        System.out.println("Dell brand");
    }
}

public class Lenovo implements Brand
{

    @Override
    public void sale()
    {
        System.out.println("Lenovo brand");
    }
}

3.3. Dimension 2

public class Computer
{
    protected Brand brand;

    public Computer(Brand brand)
    {
        this.brand = brand;
    }

    public void sale()
    {
        this.brand.sale();
    }
}

class Desktop extends Computer
{
    public Desktop(Brand brand)
    {
        super(brand);
    }

    @Override
    public void sale()
    {
        super.sale();
        System.out.println("desktop");
    }
}

public class Laptop extends Computer
{

    public Laptop(Brand brand)
    {
        super(brand);
    }

    @Override
    public void sale()
    {
        super.sale();
        System.out.println("laptop");
    }
}

4. References

• Summary of Structural Design Patterns - Structural Patterns - Jianshu