factorialimpl.java

书籍《JAVA面向对象程序设计》书籍的课后源代码。相信对很多人都有帮助

///////    FactorialImpl.java    ///////
package myrmi.example;

import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.RMISecurityManager;
import java.rmi.server.UnicastRemoteObject;

public class FactorialImpl extends UnicastRemoteObject
    implements Factorial
{ 
    public FactorialImpl() throws RemoteException
    {
        super();
    }

    public int factorial(int n)
            throws RemoteException
    {
        if ( n < 0 )
            throw( new RemoteException(
                     "Arg to factorial cannot be negative."));
        return ( n == 0 ) ? 1
               : n*factorial(n-1);
    }

    public static void main(String args[])
    { // Create and install a security manager 
        if (System.getSecurityManager() == null)
        { 
            System.setSecurityManager(new RMISecurityManager()); 
        } 
        try
        { 
            FactorialImpl obj = new FactorialImpl(); 
            // Bind this object instance to the name "FactorialServer" 
            Naming.rebind("FactorialServer", obj); 
            System.out.println("FactorialServer bound in registry"); 
        } catch (Exception e) { 
            System.out.println("FactorialImpl err: " + e.getMessage()); 
            e.printStackTrace(); 
        } 
    } 
}