出现了如下的问题： Exception in thread "AWT-java.awt.eventqueuee-0" java.lang.NullPointerException

来源：蜘蛛抓取(WebSpider) 时间：2016-05-23 13:27 标签： java.awt.event 实例
&&& 由于在做socket在线聊天室，初次使用JList作为在线用户列表。虽然有很多不懂的，都是靠API完成的。昨天因为JList遇到了一些问题，影响了项目的进度。自己也参考了很多其他人的解决方案，但是和我的问题终究不同，以下是我的代码。package com.socket.import java.awt.event.ActionEimport java.awt.event.ActionLimport java.io.IOEimport javax.swing.*;public class test {
DefaultListM
public static void main(String args[]){
new test().createUI();
public void createUI(){
frame = new JFrame("Test JList");
delete = new JButton("删除");
model = new DefaultListModel();
list = new JList(model);
String datas[] = {"aaa","bbb","ccc","ddd","eee","fff","ggg"};
list.setListData(datas);
//错误做法
//正确做法
for(String data:datas){
model.addElement(data);
delete.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
Object values[] = list.getSelectedValues();
for(Object value:values){
model.removeElement(value);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(delete,"North");
frame.add(list,"Center");
frame.pack();
frame.setVisible(true);JAVA连接SQL2008出现如下错误，求大神指导！_百度知道
JAVA连接SQL2008出现如下错误，求大神指导！
swing.Container.base.awt.run(Unknown Source) at java.dispatchEvent(Unknown Source) at java.LightweightDispatcher.pumpEvents(Unknown Source) at java.processMouseEvent(Unknown Source) at java.AbstractButton$Handler.jdbc.processMouseEvent(Unknown Source) at java.EventDispatchTPrintWriter.processEvent(Unknown Source) at java.awt.setPrintWriter(Ljava&#47.doPrivileged(Native Method) at java.UtilDebug.doIntersectionPrivilege(Unknown Source) at java.ProtectionDomain$1.dispatchEvent(Unknown Source) at java.ProtectionDomain$1.awt.dispatchEventImpl(Unknown Source) ponent.actionPerformed(systems.awt: com.EventDispatchThread.LightweightDispatcher.security.awt.processEvent(Unknown Source) at java.sql.BaseDriver.Container.awt.awt.doPrivileged(Native Method) at java.NoSuchMethodError. java.)V at com.BaseDriver.EventDispatchThread.awt.dispatchEventImpl(Unknown Source) at java.awt.plaf.swing.dispatchEvent(Unknown Source) at java.JComponent.ponent.actionPerformed(Unknown Source) at javax.getConnection(Unknown Source) at systems.EventQueue.EventDispatchThread.doIntersectionPrivilege(Unknown Source) at java.awt:80) at javax.lang.EventQueue$3.EventQueue$4.swing.AbstractButton.sql.EventQueue$4.base.security.fireActionPerformed(Unknown Source) at javax.pumpEvents(Unknown Source) at java.dispatchEvent(Unknown Source) io&#47.DriverManager.microsoft.dispatchEventImpl(Unknown Source) at java.ProtectionDomain$1.EventDispatchThread.DriverManager.AccessController.dispatchEventImpl(Unknown Source) at java.awt.Container.awt.swing.security.awt.java.pumpOneEventForFilters(Unknown Source) at java.fireActionPerformed(Unknown Source) at javax.EventQAWT-EventQueue-0&quot.access$000(Unknown Source) at java.awt.awt.retargetMouseEvent(Unknown Source) at java.swing.awt.awt.mouseReleased(Unknown Source) at java.LightweightDispatcher.ponent.microsoft.processMouseEvent(Unknown Source) at javax.run(Unknown Source) at java.pumpEventsForHierarchy(Unknown Source) at java.EventQueue$3.run(Unknown Source) at java.AccessController.ponent.util.awt.setupDebugging(Unknown Source) at com.awt.awt.dispatchEventImpl(Unknown Source) at java.EventDispatchThread.run(Unknown Source) at java.pumpEventsForFilter(Unknown Source) at java.awt.getConnection(Unknown Source) at java.security.microsoft.security.connect(Unknown Source) at java.setPressed(Unknown Source) at javax.DefaultButtonModel.doIntersectionPrivilege(Unknown Source) at java.ponent.jdbcException in thread &quot
SELECT * FROM consumer where username=&DatabaseName=housesystem&quot:1433.createStatement(ResultSet,&quot.CONCUR_UPDATABLE).getConnection(&Statement stmt = con,&+name.TYPE_SCROLL_SENSITIVE;/;'sa&jdbc,
ResultSet rs =&#39:+&quot代码如下Connection con = DriverM&:/);&quot.getText()+&).executeQuery(&sa&quot
我有更好的答案
如果我眼睛没花的话。1433后面，你写的是分号
楼下的二位 你连sql数据库1433后面不是；难道还是什么啊？ 用户名跟密码是自己设置的为何就不能连上呢？
你确定用sa
sa这个用户名和密码能连上SQL2008?
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