what is the difference between the pointer in C and the reference type injava

Answer 1

A full answer can be found indepth on StackExchange by Joachim Sauer, so here is my short summary.

Pointers in C can perform pointer arithmetic, whereas java references can not. As you can't manipulate the underlying value of a reference in Java.

Java references are strongly typed. Whereas a pointer in C can be cast from int* to char*. In Java you can cast an Object ref to a String, only if that Object is actually a String

This makes Pointers in C more flexible/powerful than Java References. However, this also means that Pointers in C are more dangerous.