Using RMI, write an application for a prototype opinion poll system. Assume that only one issue is being polled. Respondents may choose yes, no , or don't care. Write a server application to accept the votes, keep the tally (in memory), and provide the current counts to those who are interested.

Question

What will be an ideal response?

Answer 1

The Server Interface is as follows:
```
// @param vote – ‘Y’ or ‘N’
// @return a string containing the tallies of the votes
public String castVote(char vote )
throws java.rmi.RemoteException;

}
```

```
The server object implementation is as follows:
import java.rmi.*;
import java.rmi.server.*;
import java.util.Vector;

/**
* This class implements the remote interface
* CallbackServerInterface.
* @author M. L. Liu
*/

public class VoteServerImpl extends UnicastRemoteObject
implements VoteServerInterface {

private Vector clientList;
private int yesCount, noCount;


public VoteServerImpl() throws RemoteException {
super( );
yesCount = 0;
noCount = 0;
}

public String castVote(char vote )
throws java.rmi.RemoteException {
if (vote == 'Y')
yesCount++;
else
noCount++;
return (“Yes = “ + yesCount + “; No = “ + noCount);
}
}// end VoteServerImpl class
```