Before Applying job posting in any websites or recruiting agencies or sending resumes to job recruiters or any other employment website you need to improve your skills on general knowledge, Aptitude, Puzzles, logical reasoning, general english, database, programming as per your job profile. Job recruiters or mostly preferring job candidates who are having more stuff in those categories mentioned above. So improving more skills on your job profile always boost up your career and your performance. Even hiring companies and job recruiters who are looking for many job posting websites actually they are looking and filtering on these activities. In these Java J2ee section you need to update more questions to perform well in front of job recruiters and companies. Java J2ee Interview questions are most important to score in interview, Update all questions to score well in all rounds in job interview.

JAVA / J2EE interview questions and answers

Explain in short use case diagram in UML?

They describe “WHAT” of a system rather than “HOW” the system does it. They are used to identify the primary elements and processes that from the system. They primary elements are termed as “actors” and the processes are called “use cases”. Use Case diagrams shows “actors” and there “roles”.

Explain in short Class diagram in UML?

From the use case diagram we can now go to detail design of system, for which the primary step is class diagram. The best way to identify classes is to consider all “NOUNS” in use cases as classes, “VERBS” as methods of classes, relation between actors can then be used to define relation between classes. The relationship or association between the classes can be either an “is-a” or “has-a” relationship which can easily be identified from use cases.

Explain in short Object diagram in UML?

An object is an instance of a class. Object diagram captures the state of classes in the system and their relationships or associations at a specific point of time.

Explain in short State diagram in UML?

A state diagram, as the name suggests, represents the different states that objects in the system undergo during their life cycle. Object change in response to certain simulation so this simulation effect is captured in state diagram. So basically it has a initial state and final state and events that happen in between them. Whenever you think that some simulations are complicated you can go for this diagram.

Explain in short Sequence diagram in UML?

Sequence diagram can be used to explore the logic of a complex operation, function, or procedure. They are called sequence diagrams because sequential nature is shown via ordering of messages . First message starts at the top and the last message ends at bottom. The important aspect of a sequence diagram is that it is time-ordered. This means that the exact sequence of the interactions between the objects is represented step by step. Different objects in the sequence diagram interact with each other by passing “messages”.