Monday, March 11, 2013

Java Interview Questions

  •   if(null==null){

System.out.println("Both are equal");
System.out.println("Both are not equal");
           What is the output for the above code?

          Output : Both are equal.

  • Difference between finally and finalize?
  • What is cloning? what is deep and shallow cloning? How to do deep cloning?
  • How you write the program to read the file?
  • which version of java you used?
  • What is the difference between encapsulation and polymorphism?
  • Can you tell me about oops concepts?
  • what is polymorphism? Did you used anywhere in your project?
  • Did you work on multi threading in any of the project?
  • Can you tell me the scenarios, where you exactly used syncronization?
  • What is immutability?
  • you know how to make class as immutable object?
  • What is garbage collection? Can we invoke the garbage collection explicitly?
  • What are collections you used in your project?
  • Difference between Hashset and ArrayList?
  • How Hashset eliminates duplicates?
  • If you try to add duplicate element to the set, what happens?
  • what is the difference between java.util.Date and java.sql.Date?
  • what is the difference between java null and sql null?
  • how hashmap works internally?
  • Difference between HashMap and HashTable?
  • What is the difference between Array List and Vector?


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