CORE JAVA

• Can a main() method of class be invoked in another class?

• What is the difference between java command line arguments and C command line arguments?

• What is the difference between == & equals

• What is the difference between abstract class & Interface

• What is singleton class & it's implementation

• Use of static,final variable

• Examples of final class

• Difference between Event propagation & Event delegation

• Difference between Unicast & Multicast model

• What is a java bean

• What is synchronized keyword used for

• What are the restrictions of an applet & how to make the applet access the local machines resources

• What is reflect package used for & the methods of it

• What is serialization used for

• Can methods be overloaded based on the return types ?

• Why do we need a finalze() method when Garbage Collection is there ?

• Difference between AWT and Swing compenents ?

• Is there any heavy weight component in Swings ?

• Can the Swing application if you upload in net, be compatible with your browser?

• What should you do get your browser compatible with swing components?

• What are the methods in Applet ?

• When is init(),start() called ?

• When you navigate from one applet to another what are the methods called?

• What is the difference between Trusted and Untrusted Applet ?

• What is Exception ?

• What are the ways you can handle exception ?

• When is try,catch block used ?

• What is finally method in Exceptions ?

• What are the types of access modifiers ?

• What is protected and friendly ?

• What are the other modifiers ?

• Is synchronised modifier ?

• What is meant by polymorphism ?

• What is inheritance ?

• What is method Overloading ? What is this in OOPS ?

• What is method Overriding ? What is it in OOPS ?

• Does java support multi dimensional arrays ?

• Is multiple inheritance used in Java ?

• How do you send a message to the browser in JavaScript ?

• Does javascript support multidimensional arrays ?

• Is there any tool in java that can create reports ?

• What is meant by Java ?

• What is meant by a class ?

• What is meant by a method ?

• What are the OOPS concepts in Java ?

• What is meant by encapsulation ? Explain with an example

• What is meant by inheritance ? Explain with an example

• What is meant by polymorphism ? Explain with an example

• Is multiple inheritance allowed in Java ? Why ?

• What is meant by Java interpreter ?

• What is meant by JVM ?

• What is a compilation unit ?

• What is meant by identifiers ?

• What are the different types of modifiers ?

• What are the access modifiers in Java ?

• What are the primitive data types in Java ?

• What is meant by a wrapper class ?

• What is meant by static variable and static method ?

• What is meant by Garbage collection ?

• What is meant by abstract class

• What is meant by final class, methods and variables ?

• What is meant by interface ?

• What is meant by a resource leak ?

• What is the difference between interface and abstract class ?

• What is the difference between public private, protected and static

• What is meant by method overloading ?

• What is meant by method overriding ?

• What is singleton class ?

• What is the difference between an array and a vector ?

• What is meant by constructor ?

• What is meant by casting ?

• What is the difference between final, finally and finalize ?

• What is meant by packages ?

• What are all the packages ?

• Name  calsses you have used ?

• Name  classes that can store arbitrary number of objects ?

• What is the difference between java.applet.* and java.applet.Applet ?

• What is a default package ?

• What is meant by a super class and how can you call a super class ?

• What is anonymous class ?

• Name interfaces without a method ?

• What is the use of an interface ?

• What is a serializable interface ?

• How to prevent field from serialization ?

• What is meant by exception ?

• How can you avoid the runtime exception ?

• What is the difference between throw and throws ?

• What is the use of finally ?

• Can multiple catch statements be used in exceptions ?

• Is it possible to write a try within a try statement ?

• What is the method to find if the object exited or not ?

• What is meant by a Thread ?

• What is meant by multi-threading ?

• What is the  way of creating a thread ? Which is the best way and why?

• What is the method to find if a thread is active or not ?

• What are the thread-to-thread communcation ?

• What is the difference between sleep and suspend ?

• Can thread become a member of another thread ?

• What is meant by deadlock ?

• How can you avoid a deadlock ?

• What are the three typs of priority ?

• What is the use of synchronizations ?

• Garbage collector thread belongs to which priority ?

• What is meant by time-slicing ?

• What is the use of 'this' ?

• How can you find the length and capacity of a string buffer ?

• How to compare two strings ?

• What are the interfaces defined by Javalang ?

• What is the purpose of run-time class and system class

• What is meant by Stream and Types ?

• What is the method used to clear the buffer ?

• What is meant by Stream Tokenizer ?

• What is serialization and de-serialisation ?

• What is meant by Applet ?

• How to find the host from which the Applet has originated ?

• What is the life cycle of an Applet ?

• How do you load an HTML page from an Applet ?

• What is meant by Applet Stub Interface ?

• What is meant by getCodeBase and getDocumentBase method ?

• How can you call an applet from a HTML file

• What is meant by Applet Flickering ?

• What is the use of parameter tag ?

• What is audio clip Interface and what are all the methods in it ?

• What is the difference between getAppletInfo and getParameterInfo ?

• How to communicate between applet and an applet ?

• What is meant by event handling ?

• What are all the listeners in java and explain ?

• What is meant by an adapter class ?

• What are the types of mouse event listeners ?

• What are the types of methods in mouse listeners ?

• What is the difference between panel and frame ?

• What is the default layout of the panel and frame ?

• What is meant by controls and types ?

• What is the difference between a scroll bar and a scroll panel?

• What is the difference between list and choice ?

• How to place a component on Windows ?

• What are the different types of Layouts ?

• What is meant by CardLayout ?

• What is the difference between GridLayout and GridBagLayout ?

• What is the difference between menuitem and checkboxmenu item ?

• What is meant by vector class, dictionary class , hash table class,and property class ?

• Which class has no duplicate elements ?

• What is resource bundle ?

• What is an enumeration class ?

• What is meant by Swing ?

• What is the difference between AWT and Swing ?

• What is the difference between an applet and a Japplet?

• What are all the components used in Swing ?

• What is meant by tab pans ?

• What is the use of JTree ?

• How can you add and remove nodes in Jtree?

• What is the method to expand and collapse nodes in a Jtree ?

• What is the use of JTable ?

• What is meant by JFC ?

• What is the class in Swing to change the appearance of the Frame in Runtime

• How to reduce flicking in animation ?

• What is meant by Javabeans ?

• What is JAR file ?

• What is meant by manifest files ?

• What is Introspection ?

• What are the steps involved to create a bean ?

• Say any two properties in Beans ?

• What is persistence ?

• What is the use of beaninfo ?

• What are the interfaces you used in Beans ?

• What are the classes you used in Beans ?

• What is the diffrence between an Abstract class and Interface ?

• What is user defined exception ?

• What do you know about the garbate collector ?

• What is the difference between C++ & Java ?

• How do you communicate in between Applets & Servlets ?

• What is the use of Servlets ?

• In an HTML form I have a Button which makes us to open another page in  seconds How will do you that ?

• What is the difference between Process and Threads ?

• How will you initialize an Applet ?

• What is the order of method invocation in an Applet ?

• When is update method called ?

• How will you communicate between two Applets ?

• Have you ever used HashTable and Dictionary ?

• What are statements in JAVA ?

• What is JAR file ?

• What is JNI ?

• What is the base class for all swing components ?

• What is JFC ?

• What is Difference between AWT and Swing ?

• Considering notepad/IE or any other thing as process, What will happen if you start notepad or IE  times? Where  processes are started or  threads are started ?

• How does thread synchronization occurs inside a monitor ?

• How will you call an Applet using a Java Script function ?

• Is there any tag in HTML to upload and download files ?

• Why do you Canvas ?

• How can you push data from an Applet to Servlet ?

• What are the benefits of Swing over AWT ?

• Where the CardLayout is used ?

• What is the Layout for ToolBar ?

• What is the difference between Grid and GridbagLayout ?

• How will you add panel to a Frame ?

• What is the corresponding Layout for Card in Swing ?

• What is light weight component ?

• What is bean ? Where it can be used ?

• What is difference in between Java Class and Bean ?

• What is the mapping mechanism used by Java to identify IDL language ?

• Diff between Application and Applet ?

• What is serializable Interface ?

• What is the difference between CGI and Servlet ?

• What is the use of Interface ?

• Why Java is not fully objective oriented ?

• Why does not support multiple Inheritance ?

• What it the root class for all Java classes ?

• What is polymorphism ?

• Suppose If we have variable ' I ' in run method, If I can create one More thread each thread will occupy a separate copy or same variable will be shared ?

• What is Constructor and Virtual function? Can we call virtual Funciton in a constructor ?

• Why we use OOPS concepts? What is its advantage ?

• What is the difference in between C++ and Java ? can u explain in detail?

• What is the exact difference in between Unicast and Multicast ? object ? Where we will use ?

• How do you sing an Applet ?

• In a Container there are  components I want to display the all The components names, how will you do that one ?

• Why there are some null interface in java ? What does it mean ?

• Give me some null interfaces in JAVA ?

• Tell me the 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 cookies ? Explain ?

• Problem faced in your earlier project

• How OOPS concept is achieved in Java

• Features for using Java

• Public static void main - Explain

• What are command line arguments ?

• Explain about the three-tier model ?

• Difference between String & String.Buffer ?

• Wrapper class Is String a Wrapper Class ?

• What are the restriction for static method ?

• Purpose of the file class ?

• Default modifier in Interface ?

• Difference between Interface & Abstract class ?

• Can abstract be declared as Final ?

• Can we declare variables inside a method as Final Variables ?

• What is the package concept and use of package ?

• How can a dead thread be started ?

• Difference between Applet & Application ?

• Life cycle of the Applet

• Can Applet have constructors ?

• Differeence between canvas class & graphics class ?

• Explain about Superclass & subclass ?

• What is AppletStub ?

• Explain Stream Tokenizer.

• What is the difference between two types of threads ?

• Checked & Unchecked exception.

• Use of throws exception.

• What is finally in exception handling ?

• Vector class.

• What will happen to the Exception object after exception handling ?

• Two types of multi-tasking.

• Two ways to create the thread.

• Synchronization.

• I/O Filter.

• Can applet in different page communicate with each other.

• Why Java is not  100% pure OOPS ? ( EcomServer ) ?

• When we will use an Interface and Abstract class ?

• How to communicate  threads each other ?