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

Null Interfaces know as Marker Interfaces having no method.There is a method clone() in Object class.Examples  Serializable, Cloneable.

More interview questions and answers
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 â€˜ I â€˜ 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?
What is difference between String & StringBuffer?
What is Wrapper class. Is String a Wrapper Class?
What are the restriction for static method Purpose of the file class?
What is 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?
What is Life cycle of the Applet?
Can Applet have constructors?\
Differeence between canvas class & graphics class?
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?
What is Checked & Unchecked exception?
What is use of throws exception?s
What is finally in exception handling Vector class?
What will happen to the Exception object after exception handling?
Explain. Two types of multi-tasking.
Explain Two ways to create the thread.
Explain Synchronization.
Explain 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 2 threads each other ?
Describe difference between method overriding and overloading?
What is the restriction on an Overridden methods’ accessibility ?
What is the restriction on an Overridden methodsâ€™ accessibility ?
Can a method be overloaded by different return type but same argument type?
Can a method be overloaded by different return type but same argument type?
What is a "stateless" protocol?
What is constructor chaining and how to do this in Java?
What is constructor chaining and how to do this in Java?
What is passed by ref and by value?
What is passed by ref and by value?
How to ensure size of a primitive data type?
Elaborate the Garbage Collection process in Java ?
What is a difference between An interface and an abstract class?
In DB access where to write the query. In JSP or servlet?
In DB access where to write the query. In JSP or servlet?
Explain difference between Constructer and a method
Explain difference between Constructer and a method
What is serialization in Java?
Describe difference between an error and an exception?
What are differences between procedural and object oriented language?
What are differences between procedural and object oriented language?
What is the difference between a Class and an Object ?
What are the difference between DDL, DML and DCL commands?
Which one is faster DELETE/TRUNCATE?
Why threads block or enters to waiting state on I/O?
What is RDBMS?
What are different normalization forms?
What is normalization?
What are transient variables in java?
How Observer and Observable are used?
What is Stored Procedure
What is Trigger?
What is View?
What is Index?
What is List interface ?