how to create an object at runtime

[sireesha]

Hi All,
I have few questions in java.I read these questions in a site,mentioned for interview questions.But no answers are provided in that site. Any one please give me answers for these questions.
1. how to create an object at runtime?
2. what are disadvantages of multithreading programing ?
3. what is client side refresh,server side push ?

Any help is appreciated.
Thanks,
sireesha.

[Eranga]

For the first question, you can use newInstance() to create object of a class at run-time.

For the second question, I don't see any disadvantages, multithreading use heavily in my application and it gives lots of advantages to me.

I'm not clear what's your third question.

[georgemc]

Er, all objects are created at runtime. The 'new' keyword also creates objects at runtime

[ShoeNinja]

Do you not know the type of object you need until runtime?

[Eranga]

Er, all objects are created at runtime. The 'new' keyword also creates objects at runtime

Yes, that's true all objects are created in runtime. Say I change the topic to "how to get a class object at runtime" make sense.

[fishtoprecords]

2. what are disadvantages of multithreading programing ?

A quick google would answer most of your questions. While we love to help, you have to do a tiny bit of work first.

Multi-threading is how you improve responsiveness of GUI applications.

Multi-threading is how you use today's quad processors and tomorrows 16 and 32 processor chips.

The disadvantage is that doing it right is hard. Or perhaps this is good, since it will separate the real developers from the folks who read "21 days to be a Java Programmer" and claim that they are professional developers.

[Eranga]

The disadvantage is that doing it right is hard.

Yes it is, actually lots of people worried about how to deal with two threads, I mean main and addition one.

[georgemc]

Yes, that's true all objects are created in runtime. Say I change the topic to "how to get a class object at runtime" make sense.

Well, not really, since that's not what the OP asked!

[Eranga]

Ya, seems my fault. Because I thought he's talking about that. Looking his some past replays, if he has no idea that objects are creating in runtime, I'm wired. He doesn't know about objects.