Java applets games

can someone tell me how to register 2 objects who hit each other?
I mean when they hit each other.

what i'm meaning is that.
you got a rectangele
g.drawRect(...,...,...,...);
and an oval
g.drawOval(...,...,...,...,);

the oval moves up.
and hit's the rectangel on any spot
then it goes back.
if the oval misses the rectangle
it passes the border of the applet and is gone

sry for my bad English but I'm a foreigner

You're looking for collision detection algorithms.

An easy way would be to think of the oval as a rectangle too and if one of the 2 object's corners are inside the other object you have a collision.

tnx for reply but how can i do that?

ypos_rect - ypos_circ && xpos_rect-xpos_circ ?!

or

if (ypos_rect<ypos_circ && xpos_rect < xpos_cir)

I put some more time into it. The easiest way (from the code perspective) would be to create an Area object for both objects then use the "void intersect(Area)" method and test the object with "boolean isEmpty()" to see if they did collide. This might not be the most efficient way but it should work.

for more information i recommend this link.

Ow man thanks for the help I get it now.