找不到是那里出了错,收不到信息,可是发送成功(UDP聊天程序),该如何解决

package CheviC_UDP;import java.awt.*;import java.awt.event.*;import java.net.*;import java.util.*;public class UDPChat extends Frame{    Label label_myPort = null;    TextField textF_myPort = null;    Button but_sureMyPort = null;    TextArea textA_Chat = null;    ScrollPane scrollPane = null;    Label label_ip = null;    TextField textF_ip = null;    Label label_port = null;    TextField textF_port = null;    Label label_name = null;    TextField textF_name = null;    TextField textF_send = null;    Button butSend = null;    DatagramSocket socket = null;    AcceptMsg am = null;    // 构造函数    public UDPChat()    {        super("CheviC UDP Chat");        setBounds(400, 400, 600, 350);        setLayout(new BorderLayout());        setVisible(true);        init();        actionAdd();        acceptMsg();    }    // 添加组件    void init()    {        Panel p1 = new Panel();        p1.setLayout(new FlowLayout(FlowLayout.LEFT));        label_myPort = new Label("set your port here:");        p1.add(label_myPort);        textF_myPort = new TextField("5482", 3);        p1.add(textF_myPort);        but_sureMyPort = new Button("set");        p1.add(but_sureMyPort);        label_ip = new Label("           set the connect ip here:");        p1.add(label_ip);        textF_ip = new TextField("127.0.0.1",11);        p1.add(textF_ip);        label_port = new Label("port:");        p1.add(label_port);        textF_port = new TextField("5483", 3);        p1.add(textF_port);        add(p1, BorderLayout.NORTH);        textA_Chat = new TextArea(10, 40);        scrollPane = new ScrollPane();        scrollPane.add(textA_Chat);        add(scrollPane, BorderLayout.CENTER);        Panel p = new Panel();        label_name = new Label("name:");        p.add(label_name);        textF_name = new TextField("Naruto", 6);        p.add(textF_name);        textF_send = new TextField(51);        p.add(textF_send);        butSend = new Button("  Send  ");        p.add(butSend);        add(p, BorderLayout.SOUTH);    }    // 事件添加    void actionAdd()    {        // 窗体关闭        addWindowListener(new WindowAdapter()        {            public void windowClosing(WindowEvent e)            {                System.exit(0);            }        });        // 设置端口        but_sureMyPort.addActionListener(new ActionListener()        {            public void actionPerformed(ActionEvent e)            {                setMyPort();            }        });        // 发送信息        butSend.addActionListener(new ActionListener()        {            public void actionPerformed(ActionEvent e)            {                send();            }        });    }    // 设置本机端口    void setMyPort()    {        try        {            int port = Integer.parseInt(textF_myPort.getText());            socket = new DatagramSocket(port);        } catch (Exception ex)        {            textF_myPort.setText("error");        }    }    // 发送信息    void send()    {        try        {            Calendar time = Calendar.getInstance();            String sendMsg = textF_name.getText() + "("                    + time.getTime().toString() + "):\r\n"                    + textF_send.getText() + "\r\n";            byte[] msg = sendMsg.getBytes();            DatagramPacket out = new DatagramPacket(msg, 0, msg.length,                    InetAddress.getByName(textF_ip.getText().trim()), Integer.parseInt(textF_port.getText()));            socket.send(out);            showMsg(sendMsg);        } catch (Exception ex)        {            textA_Chat.append(ex.toString()+"\r\n");        }    }    // 接收消息    void acceptMsg()    {        am = new AcceptMsg();        am.start();                    //原来写错写成了am.run();    }        //显示MSG    void showMsg(String msg)    {        textA_Chat.append(msg);    }    // 接收信息的类    class AcceptMsg extends Thread    {        byte[] msg = null;        AcceptMsg()        {            msg = new byte[256];        }        @Override        public void run()        {            if (socket != null)            {                while (true)                {                    try                    {                        DatagramPacket in = new DatagramPacket(msg, msg.length);                        socket.receive(in);                        showMsg(in.getData().toString());                    } catch (Exception ex)                    {                        // TODO 接收错误时的处理                        textA_Chat.append("sorry,there is something wrong.");                    }                }            }        }    }    public static void main(String[] args)    {        new UDPChat();    }}