新手求助

[absd_000]

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: cusmsgmgt.Mgt cannot be cast to java.awt.event.ActionListener
at cusmsgmgt.Mgt.<init>(Mgt.java:67)
at cusmsgmgt.Mgt$1.run(Mgt.java:139)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:642)
at java.awt.EventQueue.access$000(EventQueue.java:85)
at java.awt.EventQueue$1.run(EventQueue.java:603)
at java.awt.EventQueue$1.run(EventQueue.java:601)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:612)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at sun.awt.Win32GraphicsConfig.getBounds(Native Method)
at sun.awt.Win32GraphicsConfig.getBounds(Win32GraphicsConfig.java:215)
at java.awt.Window.init(Window.java:394)
at java.awt.Window.<init>(Window.java:433)
at java.awt.Frame.<init>(Frame.java:403)
at java.awt.Frame.<init>(Frame.java:368)

谁能告诉我这是什么问题么？

[greency]

ClassCastException: cusmsgmgt.Mgt cannot be cast to java.awt.event.ActionListener 类转换异常 就是说 cusmsgmgt.Mgt 不能被转换为 java.awt.event.ActionListener --ClassCastException异常详情参考jdk

[absd_000]

该如何解决呢？

[安特矮油]

cusmsgmgt.Mgt cannot be cast to java.awt.event.ActionListener
明确的告诉你了Mgt不能造型为ActionListener。
让你的Mgt实现ActionListener这个借口呗

[absd_000]

JLabel jl1;
    JFrame jf;
    JMenuBar mb=new JMenuBar();
    JPanel jp=new JPanel();
    Container cp=getContentPane();
    JButton sr=new JButton("录入客户信息"),xg=new JButton("修改客户信息"),cx=new JButton("查询客户信息"),
            sc=new JButton("删除客户信息"),lxkh=new JButton("联系客户"),dyxx=new JButton("打印信息报表"),
            bak=new JButton("备份");
    public Mgt() {
        initComponents();
    }
    public Mgt(String userName)
    {
        
        mb.add(sr);
        mb.add(xg);
        mb.add(cx);
        mb.add(sc);
        mb.add(dyxx);
        mb.add(lxkh);
        mb.add(bak);
        cp.add(mb,"North");
        jp.setBorder(BorderFactory.createTitledBorder(BorderFactory
                .createLineBorder(Color.blue, 2),null,
                TitledBorder.CENTER, TitledBorder.TOP));
        jp.setLayout(new BorderLayout());
        jl1=new JLabel("欢迎使用小型客户信息管理系统");
        Toolkit kit=Toolkit.getDefaultToolkit();
        Dimension screen=kit.getScreenSize();
        int x=screen.width;
        int y=screen.height;
        setSize(750,600);
        int xcenter=(x-600)/2;
        int ycenter=(y-600)/2;
        setLocation(xcenter,ycenter);
        jl1.setLocation(xcenter,ycenter);
        jp.add(jl1,"North");
        JScrollPane scrollpane=new JScrollPane(jp);
        cp.add(scrollpane);
        setTitle("欢迎登陆");
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        sr.addActionListener((ActionListener) this);
        xg.addActionListener((ActionListener) this);
        cx.addActionListener((ActionListener) this);
        sc.addActionListener((ActionListener) this);
        dyxx.addActionListener((ActionListener) this);
        lxkh.addActionListener((ActionListener) this);
        bak.addActionListener((ActionListener) this);
        
//         new Mgt("").setVisible(true);
    }
public void actionPerformed(ActionEvent e)
    {
        String cmd=e.getActionCommand();
        if(cmd.equals("录入客户信息"))
        {
            InInfo ininfo=new InInfo();
        }
 else if(cmd.equals("修改客户信息"))
        {
     InInfo ininfo=new InInfo();
 }
 else if(cmd.equals("查询客户信息"))
        {
     InInfo ininfo=new InInfo();
 }
 else if(cmd.equals("删除客户信息"))
        {
     InInfo ininfo=new InInfo();
 }
 else if(cmd.equals("打印信息报表"))
        {
 }
 else if(cmd.equals("联系客户"))
        {
 }
 else if(cmd.equals("备份"))
        {
     Bak bak=new Bak();
 }
    }

这是我的代码，谁能帮我看看