How we pass parameter in RMI

To begin introducing who we pass parameter in RMI JAVA , let's review how parameter are passed in a single JVM.
In single JVM a primitive data type is passed by value.The mechainics of passing an object as a parameter is more complex. Often the reference of the object is passed to the method.In the method ,code use the copy of reference to access the object.

Now we look at the differences in RMI.

Primitive Parameters
for primitive parameters,the mechanics is much more the same.RMI will make a copy of the data, and send it to the remote method.

Object Parameters
The mechanics of RMI is quite different from that in a single JVM . RMI send the object itself rather than the reference of the object. It is the same case if the return value is a object.
RMI use a technology called Object serialization to transform a object into a linear format that can then be sent over network.
And there is one thing we should pay attention to .If the object is complex, like graph-like structure, it will use a lot of cpu time and network bandwidth.

Remote object Parameters

When passing an exported remote object as a parameter or return value in a remote method call, the stub for that remote object is passed instead. Remote objects that are not exported will not be replaced with a stub instance. A remote object passed as a parameter can only implement remote interfaces.