Add Custome code on Your theme…

Hello All,

I want to post a java code on my header sector.I can do this manually but i need upload this code some time.So i want to use a plugins.where i just put this code and they give a shot code for that and i just post it \into my theme like header footer,and whenever i want.

I found many plugins about that but i just give some plugins who only work for post or page.So i want to use it on my theme whenever i want to use,

So have any plugins who will do this easily?If have please tell me .I’m waiting for your replay.

Thanks