Mathew Kuruvilla

Some combination of the comparing the product of the numbers in addition to the comparing the squares of the two numbers might be good enough.
I didn't think of that earlier. Hope that is good enough ....

I have a tuple class:

public class Tuple { String num1, num2; // both num1 and num2 are a sequence of characters within the subset [0..9] that is they are numerals only text }

I want to override the hashCode method such that it gives a distinct value. However, if num1/num2 are interchanged it should return the same value for the hash code.

example if num1 == 2, num2 == 221 if the hash code is n, then when num1 == 221 and num2 == 2, the hash code should be n.
BUT
if num1 == 22 and num2 == 21 then hash code should be m where n!=m

I don't have the brains to find an algorithm to implement this If anybody can give me an algorithm, I would appreciate it.
Thanks.

PS. this is not a student assignment or anything. I was asked this in a job interview question and I still don't have the answer, that is why I am posting it.

Can somebody comment on the implication of accepting a 60 dollars per hour all inclusive in San Jose, California.
How far can that 60 dollars an hour go in living in that city? Will a person living on that income be able to save anything at the end of the day?
Thanks.

Ok. That worked for the example I gave, but the example I gave was something I made up.

What I really want is to access a local variable while iterating a collection.
For example let us say that I have an excel worksheet object and a list object,
for each internal iteration of the list object, I want to add an excel row to the worksheet with the data extracted from the list object for that particular iteration.

I don't want to post the code here as it is kinda long ... that is why I made up the code ...

Uh, I was asking about the variable Mixer mixer = new Mixer();

It is accessible inside a lambda, but I see no way of accessing it inside the method reference ...

So a method reference has limitations when compared with a lambda expression?
That is to say that a lambda expression is more flexible than a method reference??

How do I access a local variable present in the calling method from a method reference?

public class Baker { public static void makeCake(List<Ingredients> ingredients) { Mixer mixer = new Mixer (); ingredients.stream().sort().foreach(Baker::mixIngredient); } public static void mixIngredient(final Ingredient ingredient) { mixer.churn(ingredient); // how can I access mixer here?? } } }


The following seem to compile fine:

public class Baker { public static void makeCake(List<Ingredients> ingredients) { Mixer mixer = new Mixer (); ingredients.stream().sort().foreach(ingredient -> { mixer.churn(ingredient); ); } }

Thanks all. The Big Moose Saloon still has lots of friendly folks who can answer questions.

Hi All,

I had let eclipse generate some code for me, and I saw this:

public class Test { public static void main(String[] args) { try { Workbook workbook = Workbook.getWorkbook(new File("myfile.xls")); } catch (BiffException | IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

I have not yet encountered exceptions being used with the | operator.
Has it always been part of Java or is it a new addition?
If it is a new addition, what feature did it come under.

I just want to read more about it as I don't remember coming across this syntax for my SCJP ,,,

Thanks.
Mathew

Thanks, but I hope that somebody can post a simpler solution to this problem . . . .

Hi,
I have a Stateless Session Bean which does the following:

******Inside the business method*************
boolean entityBeanExists = find an entity bean

if (entityBeanExists == false)
create the entity bean
******************************************

Now, I want above operations to be atomic.
I don't want two simultaneous calls from 2 instances of the Pooled Stateless Bean to execute this code and create two instances of the entity bean.
I only want one entity bean to be created even if the above code is executed simultaneously from two instances of the Stateless Session Bean.
This can be done only if the above code is put into a synchronized block, but since we are not allowed to use the keyword "synchronized" inside EJBs, how can I achieve this effect?

Thanks.
Mathew

Hi,

When we start a java program with the -Xmx=1024m option on a machine with 4GB of RAM, is it possible for the java process to cause a memory leak, such that the entire 4GB is used up? Won't it throw an java.lang.OutOfMemory error, rather than try to allocate memory outside the 1024m limit?

Thanks.
Mathew

After doing a JNDI lookup, narrowing, ejb create etc. I get a reference to a Session bean.
Then I make an invocation on a business method of the Session Bean.
I get a timeout.

Where is this timeout specified? I would like to increase it and retry this scenario.

If anybody has a link which explains client server communication mechanism in detail, please provide it.
thanks.

That is what I thought. Thanks.

Hi, I was asked an interview question.
"What is the memory implications if the static member in a Class is not initalized"

I replied that static members are initialized to null. Clearly this was wrong, because
he went on to his next question . . .