Structural Design Patterns: Bridge Pattern

On the previous post we had a look at the adapter pattern. On this blog we are going to use the bridge pattern.
As mentioned by GOF the bright pattern usage is to “decouple an abstraction from its implementation so that the two can vary independently”.
How this translates to a software problem?
Imagine that you need to implement software for missiles.

You have Ballistic missiles, Cruise missiles, Rockets etc. Although they are all missiles and they may explode, their mechanisms differ a lot from type to type.

Taking the above into consideration most probably you are going to end with many layers of abstractions.
The missile and what it does vary a lot. And this is what the bridge pattern is all about. There is going to be a rocket abstraction and it’s behaviour will become largely different by providing a different component implementation, in our case the igniter.

We have one rocket interface specifying the missile actions.


public interface Missile {

    void explode();


And another interface which specifies the igniter actions.


public interface Igniter {

    void ignite();

And we are going to have a pyrogenic igniter implementation


public class PyrogenIgniter implements Igniter {

    public void ignite() {


Last but not least we are going to have an AirToAirMissile implementation.


public class AirToAirMissile implements Missile {

    private Igniter igniter;

    public AirToAirMissile(Igniter igniter) {
        this.igniter = igniter;

    public void explode() {

        //Actions relation to explosion


So we will implement an air to air missile.

AirToAirMissile airToAirMissile = new AirToAirMissile(new PyrogenIgniter());

As you can understand missile components vary and based on the components their functionality changes.

You can find the source code on github.

3 thoughts on “Structural Design Patterns: Bridge Pattern

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.