how many design pattern r there? and wht design pattern u
use and why ?
- 5 Answers
- 9310 Views
- HP, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / ravi ranjan kumar rajnish
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
| Is This Answer Correct ? | 5 Yes | 0 No |
Answer / smitha
23
MVC - separation of presentation and business logic
DAO- Abstracts and hides data access code from business
logic code
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / ravikiran
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
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / hima bindu
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.
| Is This Answer Correct ? | 3 Yes | 2 No |
When you Click a Button, What event will be fired?
What are the benefits of immutable objects?
When abstract methods are used?
When we give defination of interface method in the class why method must be public???
what is difference between method overloading & method overridding with example?
In java, how many ways you can take input from the console?
What are basic keywords?
What is meant by the value of a variable?
10. What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } } 10. What is the output of the following Java program? class Main { public static void main(String args[]){ final int i; i = 10; System.out.println(i); } }
I need to know about complete topic in java's collections i with an examples
Difference between linkedlist and arraylist.
Difference between the paint() and repaint() methods?
Core Java 
