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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><!-- This file edited for Java Jumpstart CD --> <HEAD><META VALUE="keyword" CONTENTS="codesamples"> <TITLE> Code Samples from the Java Developers Almanac 2000 </TITLE>   <META NAME="AUTHOR" CONTENT="Author's Name Goes Here">   <META NAME="DESCRIPTION" CONTENT="Description Goes Here">   <META NAME="KEYWORDS" CONTENT="Keyword Listing Goes Here">   <META NAME="OWNER" CONTENT="Editorial/JDC">   <META NAME="revision" CONTENT="@(#)index2.src 1.2 06/09/99  JDC">      <STYLE TYPE="text/css">     <!--      CODE {font-family: Courier, Monospace;           font-size: 12pt}     PRE {font-family: Courier, Monospace;          font-size: 11pt}       -->   </STYLE> </HEAD>  <!-- Start Body Insert--><BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" ALINK="#FF0000" VLINK="#660066"><!-- End Body Insert--> <!-- Start PageTop Insert --><TD>    <P>    <TABLE BORDER="0" WIDTH="100%" CELLPADDING="0" CELLSPACING="0">      <TR VALIGN="TOP">        <TD WIDTH="100%"><IMG SRC="../../../../images/chiclet.row.gif" WIDTH="55"           HEIGHT="18" ALT=""></TD>                  <TD ROWSPAN="4" ALIGN="RIGHT" WIDTH="152"><IMG SRC="../../../../images/developer.connection.header.gif"BORDER="0" HEIGHT="42" WIDTH="319"></TD>      </TR>            <TR VALIGN="TOP">        <TD BGCOLOR="#FFFFFF" HEIGHT="1" WIDTH="100%">        <IMG SRC="../../../../images/pixel.gif" HEIGHT="1" WIDTH="1" ALT=""></TD>      </TR>            <TR VALIGN="TOP">        <TD BGCOLOR="#CC9966" HEIGHT="1" WIDTH="100%">        <IMG SRC="../../../../images/pixel.gif" HEIGHT="1" WIDTH="1" ALT=""></TD>      </TR>            <TR VALIGN="TOP"><TD><IMG SRC="../../../../images/codesamples.gif" WIDTH="165" HEIGHT="22" ALT="Code Samples" BORDER=0></TD>      </TR>    </TABLE>    </TD>  </TR></TABLE><!-- End PageTop Insert -->  <TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0"> <TR> <TD> <FONT FACE="Verdana, Arial, Helvetica, sans-serif">  <!-- Template Version 2.0 -->  <!-- ================== --> <!-- Start Main Content --> <!-- ================== -->  <DIV ALIGN="RIGHT"> <FONT SIZE="3"><B>java.rmi</B></FONT><BR> <FONT SIZE="-1"><A HREF="../index.html">Code Samples Index</A></FONT> </DIV>  <P> <FONT SIZE="-1"> These code examples and other materials are subject to Sun  Microsystems, Inc.   <a href="../../../../share/text/SMICopyright.html">Legal Terms</a> </FONT>  <P> <H3>Returning Values from a Remote Method</H3>  Return values from remote methods must be primitive, serializable, or Remote. This example demonstrates the declaration and use of all three return types.   <P> 1. Define the remote interface. <PRE> import java.rmi.*;   public interface <font color="#0066ff"><I>RObject</I></font> extends Remote {   // This return value is primitive.   <font color="#0066ff"><I>int primitiveRet</I></font>() throws RemoteException;       // This return value implements Serializable.   <font color="#0066ff"><I>Integer byValueRet</I></font>() throws RemoteException;        // This return value implements Remote.   <font color="#0066ff"><I>ArgObject byRefRet</I></font>() throws RemoteException; }      public interface <font color="#0066ff"><I>ArgObject</I></font> extends Remote {   int <font color="#0066ff"><I>aMethod</I></font>() throws RemoteException; } </PRE>  2. Define the remote object implementation. <PRE> import java.rmi.*; import java.rmi.server.UnicastRemoteObject;      public class <font color="#0066ff"><I>RObjectImpl</I></font> extends UnicastRemoteObject    implements <font color="#0066ff"><I>RObject</I></font> {   public <font color="#0066ff"><I>RObjectImpl</I></font>() throws RemoteException {     super();   }   public <font color="#0066ff"><I>int primitiveRet</I></font>() throws RemoteException {     return <font color="#0066ff"><I>3000</I></font>;   }   public <font color="#0066ff"><I>Integer byValueRet</I></font>() throws RemoteException {     return <font color="#0066ff"><I>new Integer(2000)</I></font>;   }   public <font color="#0066ff"><I>ArgObject byRefRet</I></font>() throws RemoteException {     return <font color="#0066ff"><I>new ArgObjectImpl()</I></font>;   } } </PRE>  3. Compile the remote object implementation. <PRE> &gt; javac <font color="#0066ff"><I>RObject</I></font>.java <font color="#0066ff"><I>RObjectImpl</I></font>.java </PRE>  4. Generate the skeletons and stubs. <PRE> &gt; rmic <font color="#0066ff"><I>RObjectImpl</I></font> </PRE>  5. Create an instance of the remote object and bind it to the RMI Registry. <PRE> try {   <font color="#0066ff"><I>RObject</I></font> robj = new <font color="#0066ff"><I>RObjectImpl</I></font>();   Naming.rebind(&quot;//localhost/<font color="#0066ff"><I>RObjectServer</I></font>&quot;, robj); } catch (MalformedURLException e) { } catch (UnknownHostException e) { } catch (RemoteException e) { } </PRE>  6. Look up the remote object, invoke the methods, and receive the return values. <PRE> try {   // Look up the remote object   <font color="#0066ff"><I>RObject</I></font> robj = (<font color="#0066ff"><I>RObject</I></font>) Naming.lookup(   <font color="#0066ff"><I>&quot;//localhost/RObjectServer&quot;</I></font>);        // Receive the primitive value as return value   <font color="#0066ff"><I>int</I></font> r1 = robj.<font color="#0066ff"><I>primitiveRet</I></font>();        // Receive the serializable object as return value   <font color="#0066ff"><I>Integer</I></font> r2 = robj.<font color="#0066ff"><I>byValueRet</I></font>();        // Receive the Remote Object as return value   <font color="#0066ff"><I>ArgObject</I></font> aobj =  robj.<font color="#0066ff"><I>byRefRet</I></font>(); } catch (MalformedURLException e) { } catch (UnknownHostException e) { } catch (NotBoundException e) { } catch (RemoteException e) { } </PRE>  <P> <TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0> <TR><TD VALIGN=MIDDLE>  <FONT SIZE="-1" FACE="Verdana, Arial, Helvetica, sans-serif"> Examplets<SUP><FONT SIZE="-2">TM</FONT></SUP> &nbsp;are Copyrighted 2000 by Addison-Wesley and Patrick Chan <BR>and are provided as a courtesy for your educational, non-commercial use.<BR><BR> Order this book from <a href="http://www.amazon.com/exec/obidos/ASIN/0201432994/xeo">Amazon</a> </FONT>  </TD></TR></TABLE>     <!-- ================ --> <!-- End Main Content --> <!-- ================ -->  </FONT> </TD> </TR> </TABLE>  <!-- Copyright Insert --><TABLE WIDTH="100%" CELLPADDING="0" BORDER="0"	    CELLSPACING="5"><TR>   <TD VALIGN="TOP">   <P ALIGN=CENTER>    [ This page was updated: <!-- new date --> 11-Sep-2000 ]</TD></TR><TR><TD BGCOLOR="#CCCCCC"><SPACER TYPE="BLOCK" HEIGHT="1" WIDTH="1"></TD></TR></TD></TR></TABLE><TR>  <TR>    <TD>    <TABLE WIDTH="100%" CELLPADDING="0" BORDER="0" CELLSPACING="0">      <TR>        <TD WIDTH="50%">        <FONT SIZE="-2" FACE="Verdana, Arial, Helvetica, sans-serif">        For more information on Java technology<BR>        and other software from Sun Microsystems, call:<BR>        </FONT>        <FONT SIZE="-1" FACE="Verdana, Arial, Helvetica, sans-serif">        (800) 786-7638<BR></FONT>        <FONT SIZE="-2" FACE="Verdana, Arial, Helvetica, sans-serif">        Outside the U.S. and Canada, dial your country's         <A HREF="http://www.att.com/tollfree/international/dialguide/index.html">AT&amp;T&nbsp;Direct&nbsp;Access&nbsp;Number</A> first.<BR>        </FONT>        </TD>        <TD ALIGN="RIGHT" WIDTH="50%">        <A HREF="http://www.sun.com"><IMG SRC="../../../../images/lgsun.gif" width="64" height="30" border="0" ALT="Sun Microsystems, Inc."></A><BR>        <FONT SIZE="-2" FACE="Verdana, Arial, Helvetica, sans-serif">        Copyright &copy; 1995-2000        <A HREF="http://www.sun.com">Sun Microsystems, Inc.</A><BR>        All Rights Reserved.         <A HREF="../../../../share/text/termsofuse.html">Terms of Use</A>.         <A HREF="http://www.sun.com/privacy/index.html">Privacy&nbsp;Policy</A>.        </FONT>        </TD>      </TR>    </TABLE>	    </TD>  </TR> </TABLE></FORM><!-- End Copyright Insert -->  </BODY> </HTML>
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