What is JAR file ?

JAR stands for Java ARchive. It\'s a file format based on the popular ZIP file format and is used for aggregating many files into one.
The JAR format also supports compression, which reduces the size of the file and improves download time.

More interview questions and answers
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 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 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 15 seconds. How will do you that ?
In an HTML form I have a Button which makes us to open another page in 15 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 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 3 times? Where 3 processes are started or 3 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 fertilizable Interface ?
What is the difference between CGI and Servlets?
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 or More thread each thread will occupy a separate copy or same variable will be shared ?
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 ?
What is Constructor and Virtual function? Can we call virtual?
What is function in a constructor ?
What is function 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 ?
In a Container there are 5 components. I want to display the all the components names, how will you do that one ?
In a Container there are 5 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 ?
Which problem you had faced in your earlier project?
How OOPS concept is achieved in Java?
What is features for using Java?
How does Java 2.0 differ from Java 1.0?
Public static void main - Explain?
What are command line arguments?
Explain about the three-tier model?