Behavioral Pattern - Iterator Pattern (Example) - 1
6 May 2008The aim is to iterate through a collection of data using a common interface and more importantly, underlying implementation should not be known. We have a behavioral design pattern called ‘Iterator Pattern’ for this. I will introduce you to it in this post.
Iterator should be implemented as an interface. This allows the user to implement it anyway its easier for him/her to return data.
Iwill take an example of daily life and will show how to use iterator pattern in that. You must have used a TV remote control. We use it to change channels. Normal operatios are next channel or back channel. Now interesting thing is that different remote controls have different implementation/technology, but still the interface is the same and that is the reason that you are able to use it easily.
public interface Iterator { public Channel nextChannel(int currentChannel); public Channel prevChannel(int currentChannel); }// End of interface
We declared two methods in the interface that have to be implemented in the class that implements this interface.
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