Java SE (Java Platform, Standard Edition)

Can anyone tell me what are the files required to run jar file , i installed jre, do i need to install jdk to.

well i have a java application and i want to create a jar file and i want this application to run on different computers but i am confused with the files required to run the application.

I am assuming that i need to install
1. jre
2. run the jar file


also can anyone tell me how to use the cd command in dos if the directory name has spaces.

e.g dir name "Program Files"
i used cd "Program Files" but its not working .