64Bit OS Compatibility of Dev Tools

[ear]

Hi,
I am getting a 64bit OS and I want to know of which OS is compatible with Java ME SDK/IDE and Android SDK/IDE development environment; XP64; Vista64; Windows7 ? Or Do I need to keep a XP32 partition around?
PS: I need 64bit OS for another project I am working on so regardless, I'm going to get one, I just need to know if above tools will work or if I need to create a XP32bit partition for them.