JFrame 's components size and location problem

hellow my friends
i have a problem with a small java program that i made
the JFrames of the program are implemented based on my 17 inches screen and 1280*800 resolution
i design all the components based on my screen
have in mind that the layput pollicies for the JFrames are set to null

when i will execude my program on other computers then the sizes and the location of all the graphicas components will change while the screen size and the resolution will be different.

what i have to do exactly to solve this problem???

have in mind that the graphics will be displayed in connected with the pc plasma screens

i am waiting for the solution

Option 1) use a layout manager
Option 2) get the size of the window and do the layout manually based on that

Not every computer has a 17'' screen with 1280*800

we i am using a layout manager the components are getting to the right possition but their size does not change an is depentend from the size of the font that i am using

what i have to to about this???

any one??

it is importand

You can use setPreferredSize() on the components.

the second option is veri good idea
complicated in this point of the develop but very good
thank you very much