JAVAJ2EE Design Patterns Interview Questions You'll Most Likely Be Asked by Vibrant Publishers

Author:Vibrant Publishers
Language: eng
Format: epub
Tags: interviews, job interview questions, interviewing, interviewing help, interviewing resources, interviewing for a job, interview questions, interview preparation, vibrant publishers, interviewing book, interviewing guide, java design patterns, j2ee design patterns, design patterns interview
Publisher: Vibrant Publishers

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Miscellaneous

159: What is the use of the Template Method command?

Answer:

This command is used when an algorithm that could be implemented in multiple ways is kept in a separate Method inside a class, leaving out the specific algorithm to different subclasses.

160: What is the Object Authenticator command used for?

Answer:

This command is useful when access to an application object is restricted and requires a Client Object to furnish proper authentication credentials.

161: What is the use of the Common Attribute Registry?

Answer:

The Common Attribute Registry provides a way of design-ing a repository to store the common transient state of an application.

162: What does the Process Method do?

Answer:

The Process Method reads from the source data file and then validates the customer data using customer helper

class.

163: What does the createMemento Method do?

Answer:

This Method is responsible for the creation of the Memento Object. It also stores the DataConverter current state inside a Memento Instance and the returns it.

164: What is the purpose of the setMemento Method?

Answer:

The setMemento Method is used to retrieve information from the input Memento Object and then resets the DataConverter back to its original state.

165: What does the DCClient do?

Answer:

The DCClient instantiates the DataConverter and starts the data conversion process by invoking the process Method on this dataConverter instance.

166: What does the MementoHandler client do?

Answer:

This client contains an object reference of Memento type; it is passed as a Memento instance by the client DCClient.

167: How are new Observers added to existing ones?

Answer:

This is achieved after applying the Observer Pattern and adding them dynamically without requiring any changes to the Subject Class. Also, Observers remain unaffected when the state chance logic of the subject changes.

168: Which is the first stage of applying an Interpreter Pattern?

Answer:

The first stage is that of defining a representation for the set of rules that make up the grammar for the arithmetic expressions.

169: What is the second stage of applying an Interpreter Pattern?

Answer:

The second stage is the designing of an Interpreter that uses the classes that represent different arithmetic grammar rules to understand and then evaluate a given arithmetic expression.

170: What is the use of the Infix Expression Character?

Answer:

This is an AB+ post fix string and it is used to pop elements from the stack until a left parenthesis is found.

171: What is the CaesarCypher?

Answer:

In its simplest of forms the CaesarCypher is a rotation substitution Cypher where characters are shifted to the right by one position; this involves replacing the letter A with B, B with C and so on.

172: What does a SubstitutionCypher do?

Answer:

A SubstitutionCypher is an encryption algorithm that uses a letter substitution table to replace different letters in the plain text with corresponding entries from the substitution table.

173: What does the CodeBooCypher do?

Answer:

This algorithm involves replacing words from normal, plain text with corresponding word entries found in a code-book table.

174: Which is the first step converting an algorithm into

individual Methods?

Answer:

The first step of converting is having the template Method be a concrete and non abstract Method with calls to other Methods that represent different steps of the algorithm.

175:

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