ARUL KUMAR JAVA PDF
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Valuable resources like database connections should be closed properly to avoid any memory and performance issues Refer Q45 in Enterprise section. JTable C om ponent Eg: It is a simple drawing surface which are used for painting images or to perform other graphical operations. This will safeguard your method from not being called at runtime.
Did you have to use any design patterns in your Java project? Your chief information officer was very disappointed with this poor rating and wanted the business analysts, business owners i.
Can you call one constructor from another? What is the default value of an object reference declared as an instance variable? Action interface extends the ActionListener interface and is an abstraction of a command that does not have an explicit UI component bound to it.
It is also possible for programs to create objects that are not subject to garbage collection.
200 LATEST JAVA interview Questions pdf arul kumar
Does garbage collection guarantee that a program will not run out of memory? Further, assert construct does not throw an exception of a specified type. What is the purpose of the System class?
Emphasize on reuse of threads from a pool of threads. It helps resolve naming conflicts when different packages have classes with the same names. How will you go about building a Swing GUI client?
FileNotFoundException will be thrown if the specified file does not exist. Business logic sits on small number of centralized machines may be just one. The steps involved in building a Swing GUI are: List of items from an array of objects, then it is more efficient and it is a best practice to use Arrays. These are non-final methods defined in the Object class. Set algebra – such as finding subsets, intersections, and unions between objects.
When storing items into a collection define value objects as shown below: It is hard to extend, maintain i. Class loaders are hierarchical. EJB design patterns by Floyd Marinescu. Serialization is the process of writing the state of an object to a byte stream.
Why do you think you are qualified for this position?
What is jaga GregorianCalendar class? If you cross your boundaries then the interviewer might feel that your personal life will interfere with your work.
A class loader creates a namespace. What is type casting? Interface inheritance aka type inheritance: Presentation tier encapsulates the presentation logic required to serve clients.
Arun Kumar _ Java 5_J2EE Interviews Questions and Answers
Should not speak negatively about past colleagues atul employers. What is the relationship between clipping and repainting under AWT? A JPanel is a container as well. CO This is analogous to storing items in pigeonholes without any labeling. The ear, war and jar are standard application deployment archive files.
If you are using assertions available from JDK1. An enumeration is an interface containing methods for accessing the underlying data structure from which the enumeration is obtained. Swing components can be accessed by the Swing event dispatching thread.
If you want to jaav a checked exception that is automatically enforced by the Handle or Declare Rule, you need to extend the Aeul class.
A class is a blue print from which individual objects are created.
There are two types of inheritances: Next years to become a solution designer or an architect. You redesigned and wrote the code for a typical use case from end to end i.
Any method that touches their jaga is thread-safe. A popular design pattern. Create objects before entering the loop i.
Arun Kumar _ Java 5_J2EE Interviews Questions and Answers – Free Download PDF
Also note that each question has an icon next to it to indicate which key area or areas it belongs to. NullPointerException if name is null.
A pool of Strings is maintained by the String class.
The repaint method is used to cause paint to be invoked by the AWT painting thread. You managed to convince the business owners and analysts by providing visual mock-up screen shots of your proposed solution, presentation skills, ability to communicate without any technical jargons, and listening carefully to business needs and discussing your ideas with your fellow developers i. For example House is a Building.
It worked for me and hopefully it will work for you as well.