Does deleting vApp also delete VMs contained within?

Based on a previous discussion, I understand that a vApp is bound with a given vCenter Server. So that leads me to a few other questions...

1) Is a given vCenter Server vApp bound to a single hypervisor or can it span multiple hypervisors?

2) If I delete a vApp, do the VMs I've associated with it also get deleted, or are they simply disassociated and show up in some default location?

3) Where can I find good java examples related to creating, modifying, moving, reconfiguring, and deleting vApps at the vCenter Server level using the vSphere SDK?

Ron