Interview Questions and Answers for 'Design' | Search Interview Question

Interview Questions and Answers - Order By Rating

Q181. Explain TDD or Test Driven Design ?

Ans. TDD is a development process that involves short iterations: first an automated test case is written. Then, the code is written to pass that test, and finally one refactors the new code to acceptable standards.

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Q182. Write a program to print fibonacci series.

Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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Q183. Write code for singleton class

Design

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=singleton+class&category=code

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Q184. Write code for the usage of Builder Design Pattern

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=964

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Q185. In which cases , moving methods to utility class could be useful ?

Core Java

Ans. It could be worthy to move a method to util class if the method needs to be shared, doesn't require polymorphic behavior and need not be overridden in special cases.

Don't belong to one group through is-a relationship ( You can share through parent class method )

Don't implement a specific interface ( java 8 default methods )

Doesn't involve complex computing as you will be loosing the benefit of object state with just static method.

Doesn't require polymorphic behavior as static methods don't participate in runtime polymorphism.

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Q186. Which of the following class types in MVC should have Business Logic ?

Design

a. Model

b. View

c. Controller

d. JSP

Ans.a. Model

Q187. Listeners are example of ..

Design

a. Factory design Pattern

b. Abstract Factory Design Pattern

c. Singleton Design Pattern

d. Observer Design Pattern

Ans.d. Observer Design Pattern

Q188. Which of the following Design pattern has been used with Hibernate Criteria ?

Hibernate

a. Filter

b. Prototype

c. Builder

d. Observer

Ans.a. Filter

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