Frequently Asked Questions - Java
Frequently Asked
Questions - Java
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Can a main() method of class be invoked in another class?
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What is the difference between java command line arguments and C command line arguments?
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What is the difference between == & .equals
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What is the difference between abstract class & Interface.
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What is singleton class & it's implementation.
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Use of static,final variable
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Examples of final class
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Difference between Event propagation & Event delegation
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Difference between Unicast & Multicast model
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What is a java bean
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What is synchronized keyword used for.
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What are the restrictions of an applet & how to make the applet access the local machines resources.
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What is reflect package used for & the methods of it.
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What is serialization used for
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Can methods be overloaded based on the return types ?
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Why do we need a finalze() method when Garbage Collection is there ?
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Difference between AWT and Swing compenents ?
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Is there any heavy weight component in Swings ?
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Can the Swing application if you upload in net, be compatible with your browser?
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What should you do get your browser compatible with swing components?
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What are the methods in Applet ?
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When is init(),start() called ?
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When you navigate from one applet to another what are the methods called?
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What is the difference between Trusted and Untrusted Applet ?
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What is Exception ?
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What are the ways you can handle exception ?
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When is try,catch block used ?
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What is finally method in Exceptions ?
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What are the types of access modifiers ?
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What is protected and friendly ?
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What are the other modifiers ?
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Is synchronised modifier ?
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What is meant by polymorphism ?
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What is inheritance ?
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What is method Overloading ? What is this in OOPS ?
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What is method Overriding ? What is it in OOPS ?
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Does java support multi dimensional arrays ?
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Is multiple inheritance used in Java ?
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How do you send a message to the browser in JavaScript ?
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Does javascript support multidimensional arrays ?
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Is there any tool in java that can create reports ?
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What is meant by Java ?
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What is meant by a class ?
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What is meant by a method ?
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What are the OOPS concepts in Java ?
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What is meant by encapsulation ? Explain with an example
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What is meant by inheritance ? Explain with an example
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What is meant by polymorphism ? Explain with an example
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Is multiple inheritance allowed in Java ? Why ?
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What is meant by Java interpreter ?
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What is meant by JVM ?
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What is a compilation unit ?
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What is meant by identifiers ?
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What are the different types of modifiers ?
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What are the access modifiers in Java ?
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What are the primitive data types in Java ?
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What is meant by a wrapper class ?
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What is meant by static variable and static method ?
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What is meant by Garbage collection ?
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What is meant by abstract class
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What is meant by final class, methods and variables ?
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What is meant by interface ?
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What is meant by a resource leak ?
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What is the difference between interface and abstract class ?
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What is the difference between public private, protected and static
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What is meant by method overloading ?
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What is meant by method overriding ?
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What is singleton class ?
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What is the difference between an array and a vector ?
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What is meant by constructor ?
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What is meant by casting ?
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What is the difference between final, finally and finalize ?
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What is meant by packages ?
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What are all the packages ?
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Name 2 calsses you have used ?
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Name 2 classes that can store arbitrary number of objects ?
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What is the difference between java.applet.* and java.applet.Applet ?
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What is a default package ?
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What is meant by a super class and how can you call a super class ?
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What is anonymous class ?
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Name interfaces without a method ?
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What is the use of an interface ?
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What is a serializable interface ?
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How to prevent field from serialization ?
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What is meant by exception ?
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How can you avoid the runtime exception ?
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What is the difference between throw and throws ?
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What is the use of finally ?
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Can multiple catch statements be used in exceptions ?
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Is it possible to write a try within a try statement ?
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What is the method to find if the object exited or not ?
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What is meant by a Thread ?
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What is meant by multi-threading ?
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What is the 2 way of creating a thread ? Which is the best way and why?
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What is the method to find if a thread is active or not ?
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What are the thread-to-thread communcation ?
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What is the difference between sleep and suspend ?
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Can thread become a member of another thread ?
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What is meant by deadlock ?
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How can you avoid a deadlock ?
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What are the three typs of priority ?
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What is the use of synchronizations ?
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Garbage collector thread belongs to which priority ?
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What is meant by time-slicing ?
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What is the use of 'this' ?
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How can you find the length and capacity of a string buffer ?
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How to compare two strings ?
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What are the interfaces defined by Java.lang ?
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What is the purpose of run-time class and system class
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What is meant by Stream and Types ?
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What is the method used to clear the buffer ?
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What is meant by Stream Tokenizer ?
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What is serialization and de-serialisation ?
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What is meant by Applet ?
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How to find the host from which the Applet has originated ?
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What is the life cycle of an Applet ?
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How do you load an HTML page from an Applet ?
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What is meant by Applet Stub Interface ?
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What is meant by getCodeBase and getDocumentBase method ?
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How can you call an applet from a HTML file
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What is meant by Applet Flickering ?
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What is the use of parameter tag ?
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What is audio clip Interface and what are all the methods in it ?
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What is the difference between getAppletInfo and getParameterInfo ?
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How to communicate between applet and an applet ?
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What is meant by event handling ?
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What are all the listeners in java and explain ?
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What is meant by an adapter class ?
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What are the types of mouse event listeners ?
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What are the types of methods in mouse listeners ?
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What is the difference between panel and frame ?
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What is the default layout of the panel and frame ?
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What is meant by controls and types ?
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What is the difference between a scroll bar and a scroll panel.
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What is the difference between list and choice ?
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How to place a component on Windows ?
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What are the different types of Layouts ?
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What is meant by CardLayout ?
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What is the difference between GridLayout and GridBagLayout
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What is the difference between menuitem and checkboxmenu item.
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What is meant by vector class, dictionary class , hash table class,and property class ?
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Which class has no duplicate elements ?
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What is resource bundle ?
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What is an enumeration class ?
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What is meant by Swing ?
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What is the difference between AWT and Swing ?
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What is the difference between an applet and a Japplet
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What are all the components used in Swing ?
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What is meant by tab pans ?
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What is the use of JTree ?
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How can you add and remove nodes in Jtree.
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What is the method to expand and collapse nodes in a Jtree
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What is the use of JTable ?
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What is meant by JFC ?
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What is the class in Swing to change the appearance of the Frame in Runtime.
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How to reduce flicking in animation ?
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What is meant by Javabeans ?
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What is JAR file ?
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What is meant by manifest files ?
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What is Introspection ?
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What are the steps involved to create a bean ?
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Say any two properties in Beans ?
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What is persistence ?
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What is the use of beaninfo ?
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What are the interfaces you used in Beans ?
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What are the classes you used in Beans ?
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What is the diffrence between an Abstract class and Interface
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What is user defined exception ?
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What do you know about the garbate collector ?
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What is the difference between C++ & Java ?
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How do you communicate in between Applets & Servlets ?
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What is the use of Servlets ?
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In an HTML form I have a Button which makes us to open another page in 15 seconds. How will do you that ?
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What is the difference between Process and Threads ?
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How will you initialize an Applet ?
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What is the order of method invocation in an Applet ?
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When is update method called ?
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How will you communicate between two Applets ?
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Have you ever used HashTable and Dictionary ?
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What are statements in JAVA ?
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What is JAR file ?
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What is JNI ?
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What is the base class for all swing components ?
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What is JFC ?
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What is Difference between AWT and Swing ?
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Considering notepad/IE or any other thing as process, What will Happen if you start notepad or IE 3 times? Where 3 processes are started or 3 threads are started ?
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How does thread synchronization occurs inside a monitor ?
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How will you call an Applet using a Java Script function ?
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Is there any tag in HTML to upload and download files ?
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Why do you Canvas ?
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How can you push data from an Applet to Servlet ?
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What are the benefits of Swing over AWT ?
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Where the CardLayout is used ?
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What is the Layout for ToolBar ?
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What is the difference between Grid and GridbagLayout ?
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How will you add panel to a Frame ?
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What is the corresponding Layout for Card in Swing ?
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What is light weight component ?
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What is bean ? Where it can be used ?
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What is difference in between Java Class and Bean ?
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What is the mapping mechanism used by Java to identify IDL language ?
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Diff between Application and Applet ?
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What is serializable Interface ?
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What is the difference between CGI and Servlet ?
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What is the use of Interface ?
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Why Java is not fully objective oriented ?
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Why does not support multiple Inheritance ?
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What it the root class for all Java classes ?
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What is polymorphism ?
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Suppose If we have 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 ?
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What is Constructor and Virtual function? Can we call Virtual
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Funciton in a constructor ?
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Why we use OOPS concepts? What is its advantage ?
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What is the difference in between C++ and Java ? can u explain in detail?
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What is the exact difference in between Unicast and Multicast object ? Where we will use ?
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How do you sing an Applet ?
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In a Container there are 5 components. I want to display the all the components names, how will you do that one ?
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Why there are some null interface in java ? What does it mean ?
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Give me some null interfaces in JAVA ?
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Tell me the latest versions in JAVA related areas ?
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What is meant by class loader ? How many types are there? When will we use them ?
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What is meant by flickering ?
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What is meant by cookies ? Explain ?
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Problem faced in your earlier project
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How OOPS concept is achieved in Java
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Features for using Java
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How does Java 2.0 differ from Java 1.0
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Public static void main - Explain
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What are command line arguments
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Explain about the three-tier model
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Difference between String & StringBuffer
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Wrapper class. Is String a Wrapper Class
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What are the restriction for static method Purpose of the file class
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Default modifier in Interface
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Difference between Interface & Abstract class
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Can abstract be declared as Final
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Can we declare variables inside a method as Final Variables
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What is the package concept and use of package
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How can a dead thread be started
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Difference between Applet & Application
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Life cycle of the Applet
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Can Applet have constructors
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Differeence between canvas class & graphics class
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Explain about Superclass & subclass
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What is AppletStub
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Explain Stream Tokenizer
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What is the difference between two types of threads
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Checked & Unchecked exception
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Use of throws exception
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What is finally in exception handling Vector class
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What will happen to the Exception object after exception handling
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Two types of multi-tasking
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Two ways to create the thread
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Synchronization
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I/O Filter
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Can applet in different page communicate with each other
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Why Java is not 100 % pure OOPS ? ( EcomServer )
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When we will use an Interface and Abstract class ?
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How to communicate 2 threads each other ?