Does java passes by value or reference?

So the other day someone asked me

“Does Java pass by reference or by value?”

Hey I answered, I ought to know this,

“By value of course.”

So imagine an object Person P passed into a function doModifyPerson(Person p). I call P’s setter, say p.setName(”initalName”) and i then invoke p.setName(”new Name”) inside the function doModifyPerson.

Now the question is does Person p get modified?

So i answered,

“No way jose, Java is pass by value aint it”

Guess what amigos!!…I was dead wrong. Java is pass by value, of course, but in this case the Person object’s reference is passed by value, not the value itsef. So we have two references pointing to the same Person object, so u modify the reference’s value of course the object’s value changes.

But then why does this not happen with Strings, Strings are objects too, but they dont get modified inside the function. Guess what Strings are immutable.

So another instance of not getting my concepts right.

Tags: java

Http and session state

I rediscovered that Http is essentially stateless but if you want to maintain session state it can be done in three ways. Not that I did not know this, but sometimes when doing Java development there is so much to remember that we forget the simpler things in life

• Using cookies
• Using hidden form fields
• Using URL Rewriting

Tags: http, session

Your mind to my mind your thought to my thoughts

From today I have decided to start blogging right on my home page, no more seperate technical blogs. Today is a good day to blog!!

Tags: introducing