Is there a concept of “pointers” or “unsafe code” in Java? and How is a Java reference different from a C pointer?

In C we can do illegal  operations because of pointers (by accessing the address of that variable),but in the case of java it won't possible because of JVM ,In java JVM will generate the hash code(address) of the reference(variable), JVM having seperate HashMap to generate the Hash Code(Address).....................  :)

Java dosent support the concept of pointers.

since Java is a virtual machine, pointer is a useless idea.