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Marker Interfaces

26 February 2008
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Tags: Fundamental Patterns
Posted by bhandari  
Marker interfaces don't declare any methods. They are provided so that a utility class can check if the object has opted to implement a particular functionality.
A simple example is the Serializable interface in java API.

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Immutable classes

26 February 2008
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Tags: Fundamental Patterns
Posted by bhandari  
The objects which will not be changed too frequently then simply accessed should be made immutable. Though some utility functions can be provided to make changes. But the attributes should not be changed by the programmer once it has been set by the constructor.
To make a class' objects immutable, don't provide any setter methods.
A simple...

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Interfaces

26 February 2008
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Tags: Fundamental Patterns
Posted by bhandari  
A number of classes providing the same functionality in different contexts can implement same interface and a class will compose a reference of interface and hence makes changes in any of the classes. This provides single accessor for classes providing same functionality in different context.

e.g.
...

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When not to use inheritance

26 February 2008
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Tags: Fundamental Patterns
Posted by bhandari  
If the behaviour of a class changes with time, then that behaviour should not be implemented as inheritance because inheritance imposes static behaviour. Delegation/Composition should be used in such a case.

 


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