NumSenderImp.java是rmi中的一个文件。在编译他时出现如下问题:
Note:.\ss\NumSenderImp.java uses unchedked or unsafe operations.
源代码:
package ss;import java.rmi.server.*;
import java.util.*;
import java.rmi.*;/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2005</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class NumSenderImp
extends UnicastRemoteObject implements NumSender,Runnable{
public NumSenderImp() throws java.rmi.RemoteException{
number=0;
listeners=new Vector<NumListener>();
event=new NumEvent();
event.setSource(this);
}
public void addNumListener(NumListener l)throws java.rmi.RemoteException{
listeners.add(l);
}
public void removeNumListener(NumListener l)throws java.rmi.RemoteException{
listeners.remove(l);
} /**
* fireEvent
*/
private void fireEvent() {
event.setNumber(this.number);
Iterator it=listeners.iterator();
while(it.hasNext()){
try {
( (NumListener) it.next()).numChanged(event);
}
catch (RemoteException ex) {
ex.printStackTrace();
}
}
} private Vector listeners;
private int number;
private NumEvent event;
public void run() {
while(true){
try {
Thread.sleep(2000);
}
catch (InterruptedException ex) {
}
this.number++;
this.fireEvent();
}
}
}
请问各位有谁知道是什么原因。
Note:.\ss\NumSenderImp.java uses unchedked or unsafe operations.
源代码:
package ss;import java.rmi.server.*;
import java.util.*;
import java.rmi.*;/**
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2005</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
public class NumSenderImp
extends UnicastRemoteObject implements NumSender,Runnable{
public NumSenderImp() throws java.rmi.RemoteException{
number=0;
listeners=new Vector<NumListener>();
event=new NumEvent();
event.setSource(this);
}
public void addNumListener(NumListener l)throws java.rmi.RemoteException{
listeners.add(l);
}
public void removeNumListener(NumListener l)throws java.rmi.RemoteException{
listeners.remove(l);
} /**
* fireEvent
*/
private void fireEvent() {
event.setNumber(this.number);
Iterator it=listeners.iterator();
while(it.hasNext()){
try {
( (NumListener) it.next()).numChanged(event);
}
catch (RemoteException ex) {
ex.printStackTrace();
}
}
} private Vector listeners;
private int number;
private NumEvent event;
public void run() {
while(true){
try {
Thread.sleep(2000);
}
catch (InterruptedException ex) {
}
this.number++;
this.fireEvent();
}
}
}
请问各位有谁知道是什么原因。
C:\Borland\JBuilder2005\jdk1.4\bin\javaw -classpath "D:\ss\classes;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\indicim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\thaiim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\dnsns.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\sunjce_provider.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\ldapsec.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\localedata.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jsse.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\plugin.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\sunrsasign.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\charsets.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\rt.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jce.jar;C:\Borland\JBuilder2005\jdk1.4\jre\javaws\javaws.jar;C:\Borland\JBuilder2005\jdk1.4\lib\tools.jar;C:\Borland\JBuilder2005\jdk1.4\lib\dt.jar;C:\Borland\JBuilder2005\jdk1.4\lib\htmlconverter.jar" -Djava.rmi.server.codebase=file:D:\ss\classes\ -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=97ea0f6150a6450:1230,suspend=y ss.NumServer
java.lang.UnsupportedClassVersionError: ss/NumServer (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
请问该如何解决呢?