Can Java be used to Make Mobile Phone Spywares?

One person (A lecturer in an ordinary institue) told us,that he can develop a mobile phone spyware that sends him a copy of each and every SMS that the mobile phone owner sends to someone else.I wondered having heard that java can be used to develop Virus kind of programs,(even if I have heard that it can be done with C++).

I'm a JAVA Fan,and a student. I like if java can have the all abilities to do anything.But I'm not sure how can someone develop a Virus,Malware or Spyware to a Mobile Phone with java.

If it is possible,how can it be done?
Can we infiltrate the OS(Such as symbian) of Mobile phone? I really don't want to develop malwares.But I just want to know whether we can do that with java.Because as I'm still a JAVA student, I need to know whether I have missed something while learning.

If it can't be done,please tell me the reason.Because that person has lied us lot of times to make us not leaving their institute.If that person tells me again the guys who support me with forum are wrong, I must have the knowledge to talk about this matter.