java rmi example program with code

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java remote method invocation (rmi) is a mechanism that allows a java program to invoke methods that are running on a different java virtual machine (jvm), potentially on a different machine. this is useful for distributed applications where you want to call methods from remote objects as if they were local.

### overview of java rmi

1. **rmi architecture**: rmi consists of a client and a server. the server exposes remote objects that clients can invoke methods on. rmi handles the communication between the client and the server.

2. **rmi components**:
- **remote interface**: defines the methods that can be called remotely.
- **remote object**: implements the remote interface and provides the functionality.
- **rmi registry**: a simple name service that allows clients to look up remote objects.
- **client**: the application that invokes methods on the remote object.

### example rmi program

in this example, we'll create a simple rmi application that performs addition of two numbers.

#### step 1: define the remote interface

create a file named `calculator.java`.
#### step 2: implement the remote interface

create a file named `calculatorimpl.java`.
#### step 3: create the server

create a file named `calculatorserver.java`.
#### step 4: create the client

create a file named `calculatorclient.java`.
#### step 5: compile the program

compile all the java files:
#### step 6: start the rmi registry

you need to start the rmi registry before running the server. open a terminal and run:
this will start the rmi registry on the default port (1099).

#### step 7: run the server

in another terminal, run the server:
you should see the output:
#### step 8: run the client

now, in another terminal, run the client:
you should see the output:
### conclusion

you have successfully created a simple java rmi application that allows a client to call a remote method on the server to perform addition. this example can be expanded to include ...

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