Design Pasttern - Strategy Pattern Implemented in Java

by **BIT0122-Amit** Wed Jan 26, 2011 2:09 am

Lets consider this scenario-
There is a strategy game, and it has a soldier. The soldier can fight in three different modes. For example, friendly, defensive, and aggressive. When the soldier is required to fight, he will fight in the previously set mode.
If this was an average case, we could've achieved this quite easily. For example, we could simply used an if else or switch case structure and then the algorithms of fighting could be implemented quite easily.
However, this is not the case. This is a pretty big game, and each mode requires thousands of lines of effective codes.
In that case, we are going to divide the work among some developers, so that each one can individually complete the different modes separately. In previous approach, we were going to implement all the hellishly large algorithms in one soldier class. But now, we are going to make an interface, which is going to be implemented by our developers Smile

They can work around as much as they want, as long they as override the method defined in the IMode Interface.
This is the Strategy Pattern under behavioural category.
I have created one MainClass, which sets the mode and then commands the soldier to fight. There is a soldier class, which contains some details about the soldier. Finally, There is an IMode Interface and there are three fighting modes which implements the Interface.

MainClass Class:

Solider Class:

Interface Imode:

Aggressive mode class:

Defensive Mode class:

Friendly Mode class:

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