Sriram Naga

Any practical examples of where it can be used effectively in real world scenarios?

The thread gets executed anyway. But you can't refer to that thread object once you assign it to null. You will get a Null Pointer exception if you do so.

@Srinivas,

What Fred and Venkat has suggested might have suggested is correct and the right way. I assume if you were looking just for the code, you wouldn't have posted it here but googled it.

So let's see the approach.

Normally on paper, we would

1. Write each word, line by line.
2. If there is a repetition, increment the count next to the word.
3. At the end we would have the list of all words, with the respective number of occurrences to their right.

one two three two one one

one - 3
two - 2
three - 1

Think of a data structure which can solve this. Refer to Java Collections.

Also before insertion, you got to "break" the string, to have individual words.

Try it and if you don't get the answer, would be happy to help you soon.

Others, please correct me if I am wrong.

Are you referring to the use of hprof?

Please have a look at this Sun article.

http://java.sun.com/developer/technicalArticles/Programming/HPROF.html

@Aamir

Also note that you can't instantiate an abstract class. The subclass which extends the abstract class needs to implement the unimplemented methods(declared as abstract in this case).

An Interface IS-A Object can be misleading as many said above.

An Interface has no state and can't be instantiated.

Maybe the ExamLab question was referring to.. "An Interface reference IS-A Object", which surely is, since it refers to the instance of the class which implements the interface in question.

Did you increase the stack size?
Segmentation fault in this case might be due to lack of memory.
I think you have already increased the initial heap size.

We need to explicitly null the references to an object if it is in invisible state(when the strong references no longer accessible in the program though existing). How do we identify such scenarios?