Can we use pointer in java?

The term "pointer" is strongly associated with the C/C++ concept of pointers, which are variables which explicitly store memory addresses, and which can be modified arithmetically to point to any arbitrary address. In Java, pointers exist, but not as a first-class language concept. Rather, pointers only exist as an implementation detail for References. The spec says: An object is a class instance or an array. The reference values (often just references) are pointers to these objects, and a special null reference, which refers to no object. It's also telling that accessing a null reference throws a NullPointerException, not a NullReferenceException. So, clearly the Java designers were at least thinking in terms of pointers when they wrote the Java language spec. (Although really it should be called a NullReferenceException; in my opinion the name of that exception leaks through the abstraction) So, the answer is that Java References are "pointer-ish", in the sense that they are implemented in terms of pointers (just like most implementations of C++ references), but Java References provide a higher-level abstraction which restricts the programmer from manipulating the actual memory address. Syntactically, a Java reference only gives you access to the members or methods of the pointed-to Object - not the memory location of the Object. So yes, pointers exist in Java, for a certain value of "exist". But it's probably not helpful to speak in terms of "pointers" when discussing Java language concepts. read less

Using JNI we can call c functions ( may have pointers ). Direct support for C like pointers is not available due to security flaws of pointers. In java variables are mostly reference variables i.e in theory they are pointers as they point to memory. But direct allocation of specific memory segments as in C is not available in Java. In Java entire memory allocation and de-allocation is done by JVM read less