Techincal Interview Questions - JAVA

JAVA QUESTIONS

· What is the difference between an Abstract class and Interface?
· What is user defined exception?
· What do you know about the garbage collector?
· What is the difference between java and c++?
· In an HTML form I have a button which makes us to open another page in 15 seconds. How will you do that?
· What is the difference between process and threads?
· What is update method called?
· Have you ever used HashTable and Directory?
· What are statements in Java?
· What is a JAR file?
· What is JNI?
· What is the base class for all swing components?
· What is JFC?
· What is the difference between AWT and Swing?
· Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE 3 times ? Where three processes are started or three threads are started?
· How does thread synchronization occur in a monitor?
· Is there any tag in HTML to upload and download files?
· Why do you canvas?
· How can you know about drivers and database information ?
· What is serialization?
· Can you load the server object dynamically? If so what are the 3 major steps involved in it?
· What is the layout for toolbar?
· What is the difference between Grid and Gridbaglayout?
· How will you add panel to a frame?
· Where are the card layouts used?
· What is the corresponding layout for card in swing?
· What is light weight component?
· Can you run the product development on all operating systems?
· What are the benefits if Swing over AWT?
· How can two threads be made to communicate with each other?
· What are the files generated after using IDL to java compiler?
· What is the protocol used by server and client?
· What is the functionability stubs and skeletons?
· What is the mapping mechanism used by java to identify IDL language?
· What is serializable interface?
· What is the use of interface?
· Why is java not fully objective oriented?
· Why does java not support multiple inheritance?
· What is the root class for all java classes?
· What is polymorphism?
· Suppose if we have a variable 'I' in run method, if I can create one or more thread each thread will occupy a separate copy or same variable will be shared?
· What are virtual functions?
· Write down how will you create a Binary tree?
· What are the traverses in binary tree?
· Write a program for recursive traverse?
· What are session variable in servlets?
· What is client server computing?
· What is constructor and virtual function? Can we call a virtual function in a constructor?
· Why do we use oops concepts? What is its advantage?
· What is middleware? What is the functionality of web server?
· Why is java not 100% pure oops?
· When will you use an interface and abstract class?
· What is the exact difference in between Unicast and Multicast object? Where will it be used?
· What is the main functionality of the remote reference layer?
· How do you download stubs from Remote place?
· I want to store more than 10 objects in a remote server? Which methodology will follow?
· What is the main functionality of Prepared Statement?
· What is meant by Static query and Dynamic query?
· What are Normalization Rules? Define Normalization?
· What is meant by Servelet? What are the parameters of service method?
· What is meant by Session? Explain something about HTTP Session Class?
· In a container there are 5 components. I want to display all the component names, how will you do that?
· Why there are some null interface in JAVA? What does it mean? Give some null interface in JAVA?
· Tell some latest versions in JAVA related areas?
· What is meant by class loader? How many types are there? When will we use them?
· What is meant by flickering?
· What is meant by distributed application? Why are we using that in our application?
· What is the functionality of the stub?
· Explain about version control?
· Explain 2-tier and 3-tier architecture?
· What is the role of Web Server?
· How can we do validation of the fields in a project?
· What is meant by cookies? Explain the main features?
· Why java is considered as platform independent?
· What are the advantages of java over C++?
· How java can be connected to a database?
· What is thread?
· What is difference between Process and Thread?
· Does java support multiple inheritance? if not, what is the solution?
· What are abstract classes?
· What is an interface?
· What is the difference abstract class and interface?
· What are adapter classes?
· what is meant wrapper classes?
· What are JVM.JRE, J2EE, JNI?
· What are swing components?
· What do you mean by light weight and heavy weight components?
· What is meant by function overloading and function overriding?
· Does java support function overloading, pointers, structures, unions or linked lists?
· What do you mean by multithreading?
· What are byte codes?
· What are streams?
· What is user defined exception?
· In an HTML page form I have one button which makes us to open a new page in 15 seconds. How will you do that?