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To develop complicated applications we can use Struts frame work of Apache.
M-V-C II architecture is used in Struts applications.
To develop Struts based applications we need know about the Design patterns.
Definition of Design Patterns: 

Design pattern is a tree-part rule for express a relation between a certain context, a problem and a solution.
The following are useful design patterns in the designing of Struts based web applications.
1) Front Controller Design Patterns
2) Application Controller
3) Data Access object (DAO)
4) Data Transaction Object (DTO)