Download JNTUA MCA 2019 May Reg-Supply 5th Sem 9F00505c Design Patterns Question Paper

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Code: 9F00505¢c

MCA V Semester Supplementary Examinations May 2019

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DESIGN PATTERNS

(For 2009, 2010, 2011, 2012 (LC), 2013, 2014, 2015 & 2016 admitted batches only)

Time: 3 hours Max. Marks: 60

Answer any FIVE questions

All questions carry equal marks

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1. (a) Draw the interaction diagram for the “SpellCheck” object. Using Smalltalk MVC code.
   (b) Explain the step-by-step approach for effectively applying an appropriate design pattern while solving object-oriented applications.
2. (a) Define a “Command” class with single abstract method called “Compute”. Create subclasses called “Add”, “Subtract”. Using aggregation show the relationship between these commands in a “Calculator”.
   (b) Explain about various ‘Look-and-Feel’ methods in user interface design.
3. (a) Discuss about the participants and collaborations of builder pattern.
   

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   (b) Which are the situations that support an object that can be used as a prototype?
4. (a) When do we need bridge pattern? List out consequences of its implementation.
   (b) Explain the design steps involved in using adapter pattern.
5. (a) Make a brief note on storage savings and-issues related to flyweight pattern.
   (b) Design a facade class called “Programming Environment” that defines operations such as inspectObject and inspectClass for accessing the browsers.

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6. (a) Suppose the following grammar defines the regular expressions:
   Expression ::= literal | sequence | repetition | ‘(“ expression’)’
   Sequence ::= expression ‘&’ expression
   Repetition ::= expression *’
   Literal ::=a’ | ‘b’ |'c| ...{‘a’ | ‘b’ | ‘¢| ...}*
   

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   Using interpreter pattern implement the classes required for the above grammar rules.
   (b) Explain the iterator pattern for solving set of repeated tasks.
7. (a) Design a panel that generates user responses using observer pattern.
   (b) List out the advantages, disadvantages and features of memento pattern.
8. Using visitor pattern, schematically explain the user interactions in a site. Apply the principles of state transitions for a online registration application.

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