ARUL KUMAR JAVA PDF
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If there is a button instance called b1, you may add menu short cut by calling b1. What is lumar difference between the paint and repaint methods? Give a few reasons for using Java?
We can use invokeLater to execute the GUI update in the event-dispatching thread. It is designed to adapt to an evolving environment. Composite design pattern is used kuar GUI components to achieve this. Another distinct advantage of using actions is that when an action is disabled then all the components, which use the Action, become disabled.
The ordering imposed by a java. Composition simply means using instance variables that refer to other objects. A few operations are guaranteed to be thread-safe but most are not. What is a WAR file? To store items use value objects or data objects as opposed to storing every attribute in an ArrayList or HashMap.
In the following example the methods aru … and withdraw … share the same piece of code in AccountHelper class. This means javva do not know when the objects are going to be finalized.
The multiple interface inheritance also allows an object to behave polymorphically on those methods. The List and Set extends the Collection interface.
Avoid using finalize method to release nonmemory resources like file handles, sockets, database connections etc because Java has only a finite number of these resources and you do not know when the garbage collection is going to kick in to release these resources through the finalize method.
The class, which is implementing the interface, should provide the actual implementation. The newly designed data packager was also easier to maintain and extend. Called if current browser session is being terminated. What is the difference between a Window and a Frame?
LATEST JAVA interview Questions pdf arul kumar
You are better off providing some alternative means of object copying refer Q26 in Java section or simply not providing the capability. What are the benefits of Spring framework?
Technical skills alone are not sufficient for you to perform well in your interviews and progress in your career.
If it is accessed often, hashCode is a candidate for caching to enhance performance. As a software engineer, your income will start to plateau arhl 8 to 10 years. What is a Socket? No in this case the finally block will not execute because kuumar you say System. Can a constructor be made final? It is also very important not to set the initial capacity too high or load factor too low if iteration performance or reduction in space is important. Also, be apologetic for arriving late due to unfortunate situation.
Arun Kumar _ Java 5_J2EE Interviews Questions and Answers
Refer Q5 in Enterprise section. Since they are a standard, any application server at least in theory will know how to unpack and deploy them.
Java – Fundamentals 23 1. Serializable Refer Q23 in Java section ajva, java. For example, getting more job interviews, getting multiple job offers, going places in your current job, shooting The best way to make an impression in any organizations is to understand and proactively apply and 10 resolve the issues relating to the Key Areas discussed in this book. The original key object will still be in the HashMap i. If you arhl to support random access, without inserting or removing elements from any place other than the end, then ArrayList should be used.
Favor object composition over inheritance.
200 LATEST JAVA interview Questions pdf arul kumar
Sample questions and answers are shown below: Has a sandbox security model. How to avoid nested loops with Java collection classes Code to test if there are duplicate values in an array. XML messaging Refer Enterprise — JMS subsection in Enterprise section to communicate between other applications sharing the same database or kumr databases to jjava when the cache should be refreshed.
A thread is a execution in a program. Run it with —cp or —classpath option as shown below: The memory usage drastically increased during and after certain user operations like generating PDF reports. So, if you have a very large ArrayList or a StringBuffer, and you know the size in advance then you can speed things up by setting the initial size appropriately.
A better approach is to provide a kumwr constructor or a static factory method in place of a constructor. The strength of this programming methodology is that it gets the programmer to think clearly about what a function does, what pre and post conditions javx must adhere to and also it provides documentation for the caller.
Why is Java Architectural Neutral?