class Test
{
void change(StringBuffer a)
{
a.append( "hehe ");
}
public static void main(String[] args)
{
StringBuffer b=new StringBuffer( "haha ");
Test t= new Test();
t.change(b);
System.out.println(b);
}
}
运行后，打印 hahahehe
但是在EJB 3.0 中
//RoleControl.java
-----------------------
package com.shitong.authority;
public interface RoleControl
{
boolean QueryDefaultRole(StringBuffer xmlstring);
}
------------------------
//RoleControlBean.java
-----------------------
package com.shitong.authority.imp;
import javax.ejb.EJB;
import javax.ejb.Local;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import java.util.*;
import com.shitong.authority.*;
import java.io.*;
@Stateless
@Remote ({RoleControl.class})
@Local ({RoleControl.class})
public class RoleControlBean implements RoleControl
{
public boolean QueryDefaultRole(StringBuffer xmlstring)
{
xmlstring.append( "hehe ");
return true;
}
}
-----------------------
//RoleControlBeanClient
-----------------------
package com.shitong.authority.imp;
import com.shitong.authority.*;
import java.util.Properties;
import javax.naming.InitialContext;
public class RoleControlBeanClient
{
public static void main(String[] args)
{
Properties props = new Properties();
props.setProperty( "java.naming.factory.initial ", "org.jnp.interfaces.NamingContextFactory ");
props.setProperty( "java.naming.provider.url ", "localhost:1099 ");
props.setProperty( "java.naming.factory.url.pkgs ", "org.jboss.naming ");
try
{
InitialContext ctx = new InitialContext(props);
RoleControl role = (RoleControl) ctx.lookup( "RoleControlBean/remote ");
StringBuffer sXmlString=new StringBuffer( "haha ");