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Thread: Just Need Some quick help with code

  1. #1
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    Talking Just Need Some quick help with code

    Ok,

    Here goes im pretty new to java, but need to compile and run the following code. It's basicially a RMI Client Server which generates prime numbers


    Here is the source Code

    CLIENT

    import java.rmi.Naming;
    import java.rmi.RemoteException;
    import java.net.MalformedURLException;
    import java.rmi.NotBoundException;
    import java.io.*;
    public class PrimesClient
    {
    public static void main(String[] args)
    {
    try
    {
    if (args.length != 3)
    {
    System.out.println("Error usage: java PrimesClient host "
    +" min max");
    System.exit(0);
    }
    //look up the service in the registry
    Primes c = (Primes) Naming.lookup("rmi://" + args[0] +
    "/PrimesServd");
    int ct;
    int lct = 0;
    int min = Integer.parseInt(args[1]);
    int max = Integer.parseInt(args[2]);
    int[] p = c.findPrimes(min, max);
    ct = p[0];
    for (int i = 1; i < ct; i++)
    {
    lct++;
    if (lct == 12)
    {
    lct = 0;
    System.out.println();
    }
    System.out.print(" " + p[i]);
    }
    System.out.println();
    }
    catch (Exception e)
    {
    System.out.println("Exception" + e);
    System.out.println(e);
    }
    }
    }

    This is the error I receive in JCreator for Client Part
    C:\Users\Tevez aka Ratman\Desktop\PrimesClient.java:19: cannot find symbol
    symbol : class Primes
    location: class PrimesClient
    Primes c = (Primes) Naming.lookup("rmi://" + args[0] +
    ^
    C:\Users\Tevez aka Ratman\Desktop\PrimesClient.java:19: cannot find symbol
    symbol : class Primes
    location: class PrimesClient
    Primes c = (Primes) Naming.lookup("rmi://" + args[0] +
    ^
    2 errors

    Process completed.


    SERVER

    import java.rmi.Naming;
    import java.rmi.RemoteException;
    import java.rmi.RMISecurityManager;
    import java.rmi.server.UnicastRemoteObject;
    import java.rmi.registry.LocateRegistry;
    public class PrimesServd extends UnicastRemoteObject implements
    Primes
    {
    int[] p;
    public PrimesServd() throws RemoteException
    {
    super();
    p = new int[1000];
    }
    public int[] findPrimes(int min, int max) throws
    java.rmi.RemoteException
    {
    int ct = 1;
    for (int i = min; i < max; i++)
    {
    if (isPrime(i))
    {
    p[ct] = i;
    ct++;
    }
    }
    p[0] = ct;
    return p;
    }
    private static boolean isPrime(int n)
    {
    int i;
    for (i = 2; i * i <= n; i++)
    {
    if ((n % i) == 0)
    {
    return false;
    }
    }
    return true;
    }
    public static void main(String args[])
    {
    if (args.length != 1)
    {
    System.out.println("Error! correct usage java
    PrimesServd server-host");
    }
    else
    {
    try
    {
    // Create and install a security manager
    //if (System.getSecurityManager() == null) {
    //System.setSecurityManager(new
    RMISecurityManager());
    // }
    PrimesServd sc = new PrimesServd();
    Naming.rebind("rmi://" + args[0] + "/PrimesServd",
    sc);
    System.out.println("PrimesServd bound in registry");
    }
    catch (Exception e)
    {
    System.out.println(" Server err: " +
    e.getMessage());
    }
    }
    }
    }

    This is error I receive for client part

    C:\Users\Tevez aka Ratman\Desktop\PrimesServd.java:46: unclosed string literal
    System.out.println("Error! correct usage java
    ^
    C:\Users\Tevez aka Ratman\Desktop\PrimesServd.java:46: ';' expected
    System.out.println("Error! correct usage java
    ^
    C:\Users\Tevez aka Ratman\Desktop\PrimesServd.java:47: unclosed string literal
    PrimesServd server-host");
    ^
    C:\Users\Tevez aka Ratman\Desktop\PrimesServd.java:47: not a statement
    PrimesServd server-host");
    ^
    C:\Users\Tevez aka Ratman\Desktop\PrimesServd.java:56: ';' expected
    RMISecurityManager());
    ^
    5 errors

    Process completed.



    Please could someone please tell me why its not functioning


  2. #2
    Administrator copeg's Avatar
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    Default Re: Just Need Some quick help with code

    Those compiler errors tell you exactly what line they are on and are simple java syntax errors. For example
    System.out.println("Error! correct usage java
    PrimesServd server-host");
    should be
    System.out.println("Error! correct usage java " + 
    "PrimesServd server-host");

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