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B tags

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Master List of Core Java Interview Questions

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Java Language Fundamentals (Click Link To Access Questions' List)

Java EE technologies

J2EE

On constant requests by readers to put something on personal interview questions, consequently, you may like to read post on personal interview questions , prior talking about Java Enterprise Edition.Sun Microsystems introduced Java EE 5 specification under JSR 244 and the final release was made public on May ,2006.Java EE has become a cornerstone technology for enterprise level web based solution development.It has more than three million downloads and more than twenty six vendors' application servers support this specification.It is significant to go through an introduction of Java EE 5 before jumping to questions list straightaway.You can capture essence of Java EE 5 here in detail.If you directly want to access Master List of Java EE Interview Questions

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In a Java program, how can you divert program messages to the system console, but error messages, say to a file?

How do you know if an explicit object casting is needed?

What's the difference between the methods sleep() and wait()

Why would you use a synchronized block vs. synchronized method?

Can you write a Java class that could be used both as an applet as well as an application?

Can you call one constructor from another if a class has multiple constructors

How will you convert a String array to an ArrayList object?

Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written?

FileNoFoundException

IOException

Can an inner class declared inside of a method access local variables of this method?

What can go wrong if you replace && with & in the following code:

When should the method invokeLater()be used?

What's the difference between a queue and a stack?

You can create an abstract class that contains only abstract methods. On the other hand, you can create an interface that declares the same methods. So can you use abstract classes instead of interfaces?

If you're overriding the method equals() of an object, which other method you might also consider?

You are planning to do an indexed search in a list of objects. Which of the two Java collections should you use:

ArrayList or LinkedList?

How would you make a copy of an entire Java object with its state?

How can you minimize the need of garbage collection and make the memory use more effective?

There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it?

notify()

notifyAll().

Observer

How will you sort a collection object?

In a Java class, one has 10 variables. One wants to serialize only 3 variables,how can this be achieved?

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Home
Core Java
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Object Oriented Analysis and Design Basics, UML And Java
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here.
e-books and other resources on Core Java or access all Online Java and Java EE resources
Short Questions On Core Java
Interview Questions on Java 5
Continue reading...
Java EE,Open Source,Advanced Technologies Interview Questions
JEE
Java Interview Questions
personal interview questions
introduction of Java EE 5
click here.
Java Servlets
Java Server Pages and JSP Standard Tag Libraries
Enterprise Java Beans
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Java Connector Architecture
Java Mail
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Struts
Hibernate Framework
Spring Framework
Velocity
Apache AXIS
Test Driven Development (TDD)
Service Oriented Architecture
Java Design Patterns
Continue reading...
Master List Of Core Java Questions
Master List Core Java
What is an Object?
What is a Class?
What is OOAD?
What is Data Abstraction ?
What is Data Encapsulation?
What is the difference between Data Abstraction and Information Hiding?
What is Inheritance and what are different types of it?
Why Java uses Singly rooted hierarchy?
Why does Java not support Multiple Inheritance?
Why is Java not 100% pure OOP language?
What is Early Binding?
What is Polymorphism/Late Binding?
What is method overloading?
What is method overriding?
How is Java different from C++?
What is UML and how is it useful in designing large systems?
Is UML useful for procedural programming ?
What are different notations used in UML ?
What is a Use case and an Actor?
How to identify an Actor?
What is Generalization?
What is Association and how it maps into a Java class?
What is Aggregation and how it maps into a Java class?
What is Composition and how it maps into a Java class?
What is Dependency and how it maps into a Java class?
What is the purpose of State machine diagrams?
What are different kinds of Structure diagrams?
What are different kinds of Interaction diagrams?
What are different kinds of Behavior diagrams?
What is a Java Virtual Machine (JVM)?
What is a JVM consisted of?
What is a class loader and what is its responsibilities?
What is heap and stack?
How is your Java program executed inside JVM?
What is Java class file's magic number?
How JVM performs Thread Synchronization?
How JVM performs Garbage Collection?
How to profile heap usage?
What will you do if VM exits while printing "OutOfMemoryError" and increasing max heap size doesn't help?
Should one pool objects to help Garbage Collector?Should one call System.gc() periodically?
An application has a lot of threads and is running out of memory, why?
If your program is I/O bound or running in native methods, do these activities engage JVM?
What is the difference between interpreted code and compiled code?
Why Java based GUI intensive program has performance issues?
What is 64 bit Java ?
What is the difference between JVM and JRE?
What are different primitive datatypes in Java?
What are expressions,statements and blocks in Java?
What is a transient variable?
What is the difference between the '&' operator and the '&&' operator?
Why main method of Java has public static void?
If you have static block, constructor and main method in Java file then what will be the sequence of method calls?
What are the command line arguments?
Does Java support multi dimensional arrays?
What are the restrictions for static method?
Why a abstract method cannot be static?
Is 'sizeof' a keyword?
What is the precedence of operators in Java?
How is an argument passed in Java methods?
What is the difference between class variable, member variable and automatic(local) variable?
When are static and non static variables of a class initialized?
Can shift operators be applied to float types?
What are different Java declarations and their associated rules?
What are Java Modifiers?
Explain final modifier.
Can you change the reference of the final object?
Can abstract class be instantiated?
When does the compiler insist that the class must be abstract?
Where can static modifiers be used?
What is static initializer code?
Can an anonymous class implement an interface and extend a class at the same time?
What are volatile variables?
Can protected or friendly features be accessed from different packages?
How many ways can one write an infinite loop?
When do you use 'continue' and 'break' statements?
What is the difference between 'while' and 'do while' loop?
What is an Assertion and why using assertion in your program is a good idea ?
Explain Assertions with a code exmaple.
How many forms of assertions we have?
When assertions should be avoided?
What situations are best suitable for implementing assertions?
What is Exception ?
What is a user-defined exception?
What do you know about the garbage collector?
Why Java does not support pointers?
Does garbage collection guarantee that a program will not run out of memory?
What is finally in Exception handling?
What can prevent the execution of the code in finally block?
Explain 'try','catch' and 'finally' blocks?
Define Checked and Unchecked exception.
What is the difference between an abstract class and an interface?
What is the use of interface?
What is serializable interface?
Does a class inherit constructors from its superclass?
What's the difference between constructors and other methods?
If the method to be overridden has access type 'protected', can subclass have the access type as 'private'?
If you use super() or this() in a constructor where should it appear in the constructor?
What modifiers may be used with an inner class that is a member of an outer class?
Can an inner class be defined inside a method?
What is an anonymous class?
What is a thread?
What is the difference between process and threads?
What are two types of multitasking?
What are two ways of creating threads in Java and why so?
How does multithreading take place on a computer with a single CPU?
How a Java object be locked for exclusive use by a given thread?
What is Synchronization?
Explain wait(),notify(), and notifyAll() methods?
What is a Daemon thread?
How a dead thread can be started?
What is the difference between String and StringBuffer?
How is '==' different from .equals() method in case of String objects?
Explain StreamTokenizer?
What is Collection?
Explain List,Set and Map.
What is the serialization?
What is the difference between Serializable and Externalizable interface?
What is memory leak?
Difference between ArrayList and Vector class?
What is the difference between Hashtable and HashMap?
What is JFC?
What is the difference between JFC Swing and AWT?
What is the base class for all swing components?
What are lightweight and heavyweight components ?
How can a GUI component handle its own events?
What is a Layout Manager and what are its different types and their advantages?
How are the elements of a GridBagLayout organized?
What are the problems faced by Java programmers in absence of layout managers?
Where the CardLayout is used?
What is the difference between GridLayout and GridBagLayout?
How will you add a panel to a frame?
What is the difference between Application and Applet?
Explain Lifecycle of the Applet and what is the order of method invocation in an applet?
What is the difference between Java class and bean?
What is difference between trusted and untrusted applet?
How do you set Java Library path programmatically?
Explain the usage of java.util.Date and more classes and APIs for date handling in Java?
What is JDBC ?
What are four drivers available in JDBC?
How do you establish database connection using JDBC?
How do you connect to a MySql Database using JDBC?
What are the different types of Statements?
What is PreparedStatement and how is different from Statement?
What is the difference between executeQuery () and execute() ?
What is the difference between executeQuery () and executeUpdate()?
How do you call a stored procedure in Java?
What are new features from JDBC2.0 onwards?
How can a cursor move in scrollable result sets?
Differentiate TYPE_SCROLL_INSENSITIVE and TYPE_SCROLL_SENSITIVE?
How will you differentiate the following two ways of loading a database driver?
How can you display a particular web page from an applet?
How can you get the hostname on the basis of IP addres ?
How can you get an IP address of a machine from its hostname?
How do you know who is accessing your server?
What are different socket options?
What should I use a ServerSocket or DatagramSocket in my applications?
Continue reading...
Master List Of Java EE,Open Source,Advanced Technologies Questions(Release I )
JEE
What is a servlet? Explain its lifecycle.
What is the difference between CGI and servlets?
What is a middleware and what is the functionality of Webserver?
Can there be more than one instance of a servlet at one time ?
Why there are no constructors in servlets?
What is a Servlet Context?
What is meant by Session tell me something about HttpSession?
What is the difference between GenericServlet and HTTPServlet?
What is the difference between doGet and doPost methods of HttpServlet class?
Why do GenericServlet and HttpServlet class implement Serializable interface?
How will you pass values from HTML to the servlet?
Can you use System.exit in your servlet end code?
If my browser does not support Cookie and my server sends a Cookie instance what will happen?
Can you use System.exit in your servlet end code?
What is the difference in between encodeRedirectURL and encodeURL?
How do you make servlet thread-safe?
How do you communicate between applet and servlet?
What is the difference between Java Servlets and Java ServerPages (JSP)?
What is the difference between page directive 'include' and 'jsp include' action command?
What is the difference between 'jsp:forward' and HttpResponse.sendRedirect()?
What is the difference between 'include file=".."' and 'jsp:include page = ... '?
What are implicit objects in JSP?
Explain different constituents of JSP like comments,expressions,declarations,scriptlets.
Does JSP support XML pages creation?
How can I show various kind of documents to a web client from JSP's and/or servlets?
How will you handle runtime exceptions in your JSPs?
How can you prevent caching in JSP?
How EJB evolved over the years?
What are Entity Bean and Session Bean?
How is container managed entity bean created?
What is the difference between Container managed persistent and Bean managed persistent
What is the difference between ejbCreate() and ejbPostCreate() in EntityBean?
What are the services provided by the EJB container ?
What are new features of EJB3?
What is Connection Pooling? Is it advantageous?
What's difference between Servlet/JSP session and EJB session?
How is JDO(Java Data Object) different from VO(Value Object) ?
What is session facade?
What are Bean-Managed Transactions?
What are some tips for using bean-managed transaction demarcation?
What is JTS ?
What are transaction properties?
What are transaction attributes ? Which transaction attributes should I use in which situations?
How can you handle transaction isolation?
What is Struts and how it helps in web development?
Explain Struts1.x in a nutshell?
What are the methods in Action class?
How you will handle errors and exceptions in Struts?
How does Validator framework work in Struts?
What is DispatchAction?
How to handle duplicate submits in Struts?(new)
What is Spring framework
Why is Spring Framework needed anyway?
What do you understand by Inversion of Control/Dependency Injection?
What is BeanFactory?
Explain ApplicationContext in Spring framework.
What is Aspect Oriented Programming and how is it related with Spring?
What are the problems you have with JDBC and how does Spring framework help to resolve them?
Explain typical Bean life cycle in Spring Bean Factory Container
What are ORMs supported by Spring and how it integrates with Hibernate?
What is messaging and how is it different from RMI?
When is JMS needed?
How Does the JMS API Work with the Java EE Platform?
Explain JMS API Architecture.
Explain Point-to-Point Messaging Domain.
Explain Publish/Subscribe Messaging Domain.
What are Design Patterns and why one needs them?
What are different types of design patterns?
What is Singleton Design Pattern?
What is difference between Abstract Factory and Factory Method design patterns?
Explain Adapter Design Pattern in Java
Explain Decorator Design Pattern in Java
Explain Facade Design Pattern in Java
Continue reading...
Miscellaneous Core Java Questions With Short Answers
Core Java
Continue reading...
Master List Of Code Snippets
Code Snippet
XML Parsing Using SAX
File Operations
Experimenting with java.util.Date.
Using java.lang.reflect.* APIs
Using java.lang.Comparable.* interface
Thread Interruption
Get Locale Specific Date
Write Into An Excel File Using Java
Sending EMail To GMail SMTP Server Using Java Mail APIs
Some commonly used validations like EMail,Phone Number,SSN,Numeric values through Regular Expressions
Continue reading...
Simplifying Service Oriented Architecture
Service Oriented Architecture
What is SOA?
Why SOA?
What are the constituents of SOA?
Who suits best for SOA?
When to avoid implementation of SOA?
How to avoid risks in SOA implementation?
How SOA makes things better or even worse?
How to develop,test and maintain SOA based solutions?
How to register Web Services with UDDI4j?
Webservices, Apache Axis Way
Webserivces With Apache Axis Continued...
Apache AXIS with IBM's WSAD/RAD
Continue reading...
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