C++作为安全语言的java解释

Question

有人能帮助我理解以下攻击是什么，以及java是如何让这些攻击变得不可能的：

1. overrunning the routine stack- a common attack of worms and viruses
2. corrupting memory outside its own process space
3. reading or writing files without permission.

我精通c/c++并从java开始，所以请帮助我理解这些