In case of sun technology, we can categories in two type
java design pattern and j2ee design pattern.
java design pattern is divided into three category futher
creational pattern, structered pattern and behavioral
pattern.
in J2ee there is 15 types of design pattern
Design pattern is the solution for a recurring problem.
Mvc-2 design pattern---For the sake of seperation between
presentation logic and business logic
Data Access Object-----For maintaining databae logic
seperatly
Data Transfer Object---To Maintain Getters and setters for
database columns
so many design patterns are used for solving the reoccurs
problems.Mainly these design patterns are used for EJB
Application.They are
1.Front Controller - handling all the requests form client.
2.Application Controller/Business deligate - this is used
for delgate the request to appropriate method in business class.
3.Service Locater -- this is used for the get the reference
of home object.
4.Data Access Object -- It is uesd for connecting with the
databases like hibernate,jdbc connections,JNDI and Etc.
5.Data Transfer Object/Value Object --- if you want to
transfer the data from bean to client and vice-versa.We
create one helper class.In this class we r writing some
setters and getters are used for data transfer.
class A{
m2(){
}
}
class B extends A{
m2(){
}
}
class c extends B{
m2(){
}
}
class my_class extends c{
m2(){
}
pulic static void main(){
...My_class a = new my_class();
super.super.super.m2(); is this is leagal
if not find what is the legal procedure in order to call A's
version of m2();
}
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