What is port number in java?
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printstream class method println() is calling using System class and its static object out .how it is explain any one in detail with example ?
Can bool be null?
How will you invoke any external process in java?
what is meant wrapper classes?
What exceptions occur during serialization?
What is the difference between serializable and externalizable interfaces?
What is the arraylist in java?
What is object data type?
What part of memory - Stack or Heap - is cleaned in the garbage collection process?
I don’t want my class to be inherited by any other class. What should I do?
Can you have a constructor in abstract class?
What is passed by reference and pass by value ?