J2ee interview questions and answers for freshers pdf


 

The J2EE platform is consists of a set of services, application programming Top 50 J2EE interview questions & Answers .. Download PDF. Advanced J2EE Interview Questions and Answers for Freshers or Experienced Pdf. This interview section questions contains a brief introduction to the Java. Interview Questions And Answers For Experienced Free [PDF] [EPUB] Top Java Java Programming Interview Questions for Freshers.

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J2ee Interview Questions And Answers For Freshers Pdf

If you're looking for J2EE Interview Questions for Experienced or Freshers, you are at right place. There are lot of opportunities from many reputed companies in . This tutorial contains frequently asked J2EE Interview Questions with best descriptive answers on different J2EE concepts like JSP, The document can use to fresher's as well as years' experience programmers to have a. variable. top 50 j2ee interview questions & answers - career guru99 - top 50 interview questions and answers for freshers - tldr - [pdf]free j2ee.

The functionality of J2EE is developing multitier web-based applications. Java Servlet and Java Server Pages technology components are web components. Servlets are Java programming language that dynamically receives requests and makes responses. JSP pages execute as servlets but allow a more natural approach to creating static content. JSF provides a set of reusable UI components, a standard for web applications. It automatically saves the form data to the server and populates the form date when display on the client side. Hashtable is a collection Synchronized object.

Examples of enterprise information systems include enterprise resource planning systems, mainframe transaction processing systems, and legacy database systems. Answer : An entity that provides enterprise information system-specific functionality to its clients. Examples are a record or set of records in a database system, a business object in an enterprise resource planning system, and a transaction program in a transaction processing system. What Is Enterprise Javabeans ejb?

Answer : A component architecture for the development and deployment of object-oriented, distributed, enterprise-level applications. Applications written using the Enterprise JavaBeans architecture are scalable, transactional, and secure. Answer : Defines the queries for the finder and select methods of an entity bean having container-managed persistence. What Is An Entity?

Answer : A distinct, individual item that can be included in an XML document by referencing it. An entity reference can also reference an entire document, an external entity, or a collection of DTD definitions.

Is runnable a Marker interface? No , it has run method declared. Difference between Process and Thread? Process is a program in execution whereas thread is a separate path of execution in a program.

What is a Deadlock?

Difference between Serialization and Deserialization? Serialization is the process of writing the state of an object to a byte stream. Deserialization is the process of restoring these objects. Explain Autoboxing? Autoboxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes Q What is an Enum type? An enum type is a special data type that enables for a variable to be a set of predefined constants Q What are Wrapper Classes?

What are Primitive Wrapper Classes?

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A wrapper class is any class which "wraps" or "encapsulates" the functionality of another class or component. A Wrapper Class that wraps or encapsulates the primitive data type is called Primitive Wrapper Class. What Design pattern Wrapper Classes implement? What is "Import" used for? Enables the programmer to abbreviate the names of classes defined in a package. Different types of memory used by JVM?

What is a class loader? What are the different class loaders used by JVM? Part of JVM which is used to load classes and interfaces. Can we declare interface methods as private? What is a Static import? By static import , we can access the static members of a class directly without prefixing it with the class name. Difference between StringBuffer and StringBuilder?

StringBuffer is synchronized whereas StringBuilder is not.

Difference between Map and HashMap? Map is an interface where HashMap is the concrete class.

110 TOP J2EE INTERVIEW QUESTIONS AND ANSWERS PDF

What is a Property class? The properties class is a subclass of Hashtable that can be read from or written to a stream. If the Object value will not change in a scenario use String Class because a String object is immutable. If the Object value can change and will only be modified from a single thread, use a StringBuilder because StringBuilder is unsynchronized means faster.

If the Object value may change, and can be modified by multiple threads, use a StringBuffer because StringBuffer is thread safe synchronized. Explain java. This Error is thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.

Can we have multiple servlets in a web application and How can we do that? Yes by making entries in web. How can we manage Error Messages in the web application? Within message. Is JVM, a compiler or interpretor? Its an interpretor. Difference between implicit and explicit type casting?

An explicit conversion is where you use some syntax to tell the program to do a conversion whereas in case of implicit type casting you need not provide the data type. Difference between loadClass and Class. Should we override finalize method? Finalize is used by Java for Garbage collection. It should not be done as we should leave the Garbage Collection to Java itself.

What is assert keyword used for? Explain the major benefits of Hibernate? Define the web components and how are they helpful? How will you define save or update methods in Hibernate? How will you differentiate the get and Load methods? List the advantages of ORM object-relational mapping? Describe the web container in J2EE? Define the concept of connection pooling? What is Spring Framework and discuss its benefits?

What are the different type of collections in hibernate? What is a thin client? Define the servlet? Name the different phases of servlet lifecycle?

Name the major components for J2EE apps briefly? Client-tier components are made to run on client machine. Web tier components are made to run on J2EE server. Reactjs Interview Questions and Answers for Experienced.

Top 50 J2EE interview questions & Answers

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