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Correct answer is (b) Model view Controller

The best I can EXPLAIN: Model REPRESENTS an OBJECT or JAVA POJO carrying data.View represents the visualization of the data that model contains. The controller acts on both model and view. It is usually used in web development.

Right option is (a) ITERATOR pattern

The EXPLANATION is: Iterator pattern represents a way to ACCESS the elements of a collection object in sequential manner without the need to know its UNDERLYING REPRESENTATION.

The CORRECT choice is (b) CHAIN of RESPONSIBILITY pattern

The explanation: Chain of responsibility pattern creates a chain of RECEIVER objects for a particular request. The sender and receiver of a request are DECOUPLED based on the type of request. This pattern is one of the behavioral patterns.

The correct answer is (d) Java

To ELABORATE: Design pattern is a general repeatable solution to a commonly occurring problem in software design. There are various patterns available for USE in day to day CODING PROBLEMS.

Right answer is (a) Singleton pattern

To ELABORATE: Singleton pattern involves a single class which is responsible to create an object while making sure that only one object GETS created. This class provides a way to access the only object which can be accessed DIRECTLY without need to INSTANTIATE another object of the same class.

The correct choice is (c) Facade PATTERN

Explanation: Facade pattern HIDES the complexities of the system and provides an interface to the client USING which client can access the system.

The CORRECT OPTION is (d) JAVA patterns

Explanation: Java patterns is not a valid CLASSIFICATION of DESIGN patterns. The correct one is J2EE patterns.

The correct answer is (d) addBatch()

To explain: addBatch() is a METHOD of JDBC batch process. It is faster in PROCESSING than executing one statement at a TIME.

Correct choice is (c) does not commit TRANSACTION automatically after each query

To EXPLAIN I would say: setAutoCommit(FALSE) does not commit transaction automatically after each query. That saves a LOT of time of the execution and hence improves performance.

The CORRECT option is (c) CallableStatment

Easiest explanation: CALLABLESTATEMENT is used in JDBC to call stored PROCEDURE from Java program.

Correct ANSWER is (a) setMaxRows(INT i)

To explain: setMaxRows(int i) METHOD is used to limit the NUMBER of rows that the database returns from the query.

Right answer is (a) java.sql.TimeStamp

Best explanation: java.sql.TIME CONTAINS only time. WHEREAS, java.sql.TimeStamp contains both time and DATE.

Correct CHOICE is (C) Prevents SQL injection

Easiest EXPLANATION: PreparedStatement in Java improves performance and ALSO prevents from SQL injection.

The correct choice is (d) BETTER performance

To EXPLAIN I would say: SINCE the JDBC connection takes time to ESTABLISH. Creating connection at the application start-up and reusing at the time of requirement, helps performance of the application.

Correct answer is (d) java.util.dateTime

Easiest EXPLANATION: java.util.DATE CONTAINS both date and time. WHEREAS, java.sql.date contains only date.

The correct CHOICE is (b) init-method

Best explanation: init-method is USED to specify the INITIALIZATION method.

Correct CHOICE is (d) Serialization

Best explanation: Serialization is not the FEATURE of JAVA Beans. Introspection, CUSTOMIZATION, Events, Properties and PERSISTENCE are the features.

Correct option is (c) java.lang.ClassFormatError

To ELABORATE: java.lang.ClassFormatError: Duplicate NAME ERROR is thrown when .class FILE in the JAR contains a class WHOSE class name is different from the expected name.

Correct option is (a) /

The BEST I can explain: MANIFEST file uses CLASSES using / file separator.

Right choice is (B) EXTENDS java.io.Serializable CLASS

Best explanation: java.io.Serializable is not a class. Instead it is an INTERFACE. Hence it cannot be EXTENDED.