hey fastmike ,
thx it helped me a lot

but there r 2 things i am yet concerned to ask

1) can i run this programs when i save them in sum diff folder ?
there must be sumthing which enables the path where javac
can b enabled
eg in f:\girish\example.java

can i run this program there and not just in bin folder
c:\j2sdk...\bin

2) whenever i tried typing cd j2sdk1.4.2_13
it said invalid folder name
so i renamed it to java2_13
will it harm other programs or jre ?
do i need to make any changes sumwhere also ?

and thx again it helped but wish i could save my programs
in sum oter files