高手来帮忙 改一下程序的逻辑错误在哪里？我对程序的要求是用组合框中的地址来进行聊天

Question

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;import java.net.*;
import java.io.*;import javax.swing.*;
import java.awt.*;import java.awt.event.*;public class Chat extends JFrame implements ActionListener{private String []name={"localhost"};private JComboBox jcombobox4;private JButton jbutton_lj;
private JDialog0 dialog1;
public Chat(){
super("fdfd");
setLocation(0,0);
setSize(400,400);
setLayout(new FlowLayout());
jcombobox4=new JComboBox(name);
jbutton_lj=new JButton("连接");
add(jcombobox4);
add(jbutton_lj);
jbutton_lj.addActionListener(this);
setDefaultCloseOperation(3);setVisible(true);dialog1=new JDialog0(this);}public void actionPerformed(ActionEvent e){
if(e.getActionCommand()=="连接"){
dialog1.jdialog0.setVisible(true);}}class JDialog0 implements ActionListener{
public JDialog jdialog0;public JPanel jpanel0,jpanel1;public JPanel jpanel2,jpanel7;public JTextArea jtextarea0,jtextarea1; public JButton jbutton_dk,jbutton_fs;public JPanel jpanel3,jpanel4,jpanel5;public JButton jbutton_sx,jbutton_lj;public JComboBox jcombobox0,jcombobox1;public JLabel jlabel0;
public JTextArea jtextarea_empoty;
public JPanel jpanel6;public JButton jbutton_save,jbutton_vido;
private ServerSocket server;
private Socket client;
private BufferedReader cin;
private PrintWriter cout;String name;public JDialog0(Chat chat){jdialog0=new JDialog(chat,"dddfd",true);
jdialog0.setSize(500,500);
jdialog0.setLocation(0,0);
jpanel0=new JPanel(new BorderLayout());jtextarea0=new JTextArea(4000,100);jpanel0.add(new JScrollPane(jtextarea0),"Center");jpanel2=new JPanel(new BorderLayout());
jtextarea1=new JTextArea(6,30);
jpanel2.add(new JScrollPane(jtextarea1),"Center");
jpanel7=new JPanel(new GridLayout(2,1));
jbutton_dk=new JButton("发送");jbutton_fs=new JButton("断开");
jpanel7.add(jbutton_fs);jpanel7.add(jbutton_dk);
jpanel2.add(jpanel7,"East");
jpanel0.add(jpanel2,"South");jdialog0.add(jpanel0,"Center");
String str0[]={"localhost","fdfd","dfd"};String []str1={"dfdf","fdd","dfd"};
jpanel1=new JPanel(new BorderLayout());jpanel3=new JPanel(new GridLayout(2,1));jpanel4=new JPanel(new BorderLayout());
jpanel5=new JPanel(new FlowLayout(2));
jbutton_sx=new JButton("刷新");jcombobox0=new JComboBox(str0);jbutton_lj=new JButton("连接");
jpanel4.add(jbutton_sx,"West");jpanel4.add(jcombobox0,"Center");jpanel4.add(jbutton_lj,"East");jpanel3.add(jpanel4);
jlabel0=new JLabel("状态");jcombobox1=new JComboBox(str1);jpanel5=new JPanel();jpanel5.add(jlabel0);jpanel5.add(jcombobox1);
jpanel3.add(jpanel5);jpanel1.add(jpanel3,"North");
jtextarea_empoty=new JTextArea();jtextarea_empoty.setEditable(false);jpanel1.add(jtextarea_empoty,"Center");jpanel6=new JPanel(new GridLayout(1,2));jbutton_save=new JButton("保存聊天记录");jbutton_vido=new JButton("音码");jpanel6.add(jbutton_save);
jpanel6.add(jbutton_save);jpanel6.add(jbutton_vido);
jpanel1.add(jpanel6,"South");
jpanel1.setSize(84,500);
jdialog0.add(jpanel1,"East");jdialog0.setDefaultCloseOperation(1);jbutton_fs.addActionListener(this);
jbutton_dk.addActionListener(this);
name="dfdfd";try{
       client=new Socket((String)jcombobox0.getSelectedItem(),2001);
       cin=new BufferedReader(new InputStreamReader(client.getInputStream()));
       cout=new PrintWriter(client.getOutputStream(),true);
       
       cout.println("jhkh");
       receiver("连接 "+cin.readLine());
       String aline="";
       do
       {
       aline=cin.readLine();
       if(aline!=null&&!aline.equals("bye"))
           receiver(aline);
       }while(aline!=null&&!aline.equals("bye"));
       
       cout=null;
       cin.close();
       cout.close();
       client.close();
       }
    catch(IOException e){try{
       server=new ServerSocket(2001);
       client=server.accept();
       cin=new BufferedReader(new InputStreamReader(client.getInputStream()));
       cout=new PrintWriter(client.getOutputStream(),true);
       
       cout.println("kjlj");
       receiver("连接 "+cin.readLine());
       
       String aline="";
       do
       {
       aline=cin.readLine();
       if(aline!=null&&!aline.equals("bye"))           receiver(aline);
       }while(aline!=null&&!aline.equals("bye"));
       
       cout=null;
       cin.close();
       cout.close();
       client.close();
       server.close();
       }
    catch(IOException ee){}
    finally{}
}
    finally{}}
public  void receiver(String message){
jtextarea0.append(message+"\r\n");}
public void actionPerformed(ActionEvent e){
 
if(e.getActionCommand()=="断开"){dk();}
if(e.getActionCommand()=="发送"){fs();}}
public void dk(){
if(this.cout!=null){
this.cout.println(name+"断开");
this.cout.println("bye");
this.cout=null;
}
jtextarea0.append("我离线\n");
}
public void fs(){
if(this.cout!=null){
this.cout.println(name+"说"+jtextarea1.getText());
jtextarea0.append("我说:"+jtextarea1.getText()+"\n");
jtextarea1.setText("");
}else{
jtextarea0.append("已断开,不能发送消息!!!\n");
}}}
public static void main(String args[]){
new Chat();
}}

Answer 1

setVisible(true); dialog1=new JDialog0(this); 
这样后面那句执行不了

Answer 2

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;public class Chat extends JFrame implements ActionListener{private String []name={"localhost"};private JComboBox jcombobox4;private JButton jbutton_lj;
private JDialog0 dialog1;
public Chat(){
super("fdfd");
setLocation(0,0);
setSize(400,400);
setLayout(new FlowLayout());
jcombobox4=new JComboBox(name);
jbutton_lj=new JButton("连接");
add(jcombobox4);
add(jbutton_lj);
jbutton_lj.addActionListener(this);
setDefaultCloseOperation(3);setVisible(true);dialog1=new JDialog0(this);}public void actionPerformed(ActionEvent e){
if(e.getActionCommand()=="连接"){
dialog1.jdialog0.setVisible(true);}}
class JDialog0 implements ActionListener{
public JDialog jdialog0;public JPanel jpanel0,jpanel1;public JPanel jpanel2,jpanel7;public JTextArea jtextarea0,jtextarea1; public JButton jbutton_dk,jbutton_fs;public JPanel jpanel3,jpanel4,jpanel5;public JButton jbutton_sx,jbutton_lj;public JComboBox jcombobox0,jcombobox1;public JLabel jlabel0;
public JTextArea jtextarea_empoty;
public JPanel jpanel6;public JButton jbutton_save,jbutton_vido;
private ServerSocket server;
private Socket client;
private BufferedReader cin;
private PrintWriter cout;String name;public JDialog0(Chat chat){jdialog0=new JDialog(chat,"dddfd",true);
jdialog0.setSize(500,500);
jdialog0.setLocation(0,0);
jpanel0=new JPanel(new BorderLayout());jtextarea0=new JTextArea(4000,100);jpanel0.add(new JScrollPane(jtextarea0),"Center");jpanel2=new JPanel(new BorderLayout());
jtextarea1=new JTextArea(6,30);
jpanel2.add(new JScrollPane(jtextarea1),"Center");
jpanel7=new JPanel(new GridLayout(2,1));
jbutton_dk=new JButton("发送");jbutton_fs=new JButton("断开");
jpanel7.add(jbutton_fs);jpanel7.add(jbutton_dk);
jpanel2.add(jpanel7,"East");
jpanel0.add(jpanel2,"South");jdialog0.add(jpanel0,"Center");String str0[]={"localhost","fdfd","dfd"};String []str1={"dfdf","fdd","dfd"};
jpanel1=new JPanel(new BorderLayout());jpanel3=new JPanel(new GridLayout(2,1));jpanel4=new JPanel(new BorderLayout());
jpanel5=new JPanel(new FlowLayout(2));
jbutton_sx=new JButton("刷新");jcombobox0=new JComboBox(str0);jbutton_lj=new JButton("连接");
jpanel4.add(jbutton_sx,"West");jpanel4.add(jcombobox0,"Center");jpanel4.add(jbutton_lj,"East");jpanel3.add(jpanel4);
jlabel0=new JLabel("状态");jcombobox1=new JComboBox(str1);jpanel5=new JPanel();jpanel5.add(jlabel0);jpanel5.add(jcombobox1);
jpanel3.add(jpanel5);jpanel1.add(jpanel3,"North");
jtextarea_empoty=new JTextArea();jtextarea_empoty.setEditable(false);jpanel1.add(jtextarea_empoty,"Center");jpanel6=new JPanel(new GridLayout(1,2));jbutton_save=new JButton("保存聊天记录");jbutton_vido=new JButton("音码");jpanel6.add(jbutton_save);
jpanel6.add(jbutton_save);jpanel6.add(jbutton_vido);
jpanel1.add(jpanel6,"South");
jpanel1.setSize(84,500);
jdialog0.add(jpanel1,"East");jdialog0.setDefaultCloseOperation(1);jbutton_fs.addActionListener(this);
jbutton_dk.addActionListener(this);
name="dfdfd";
try{
       client=new Socket((String)jcombobox0.getSelectedItem(),2001);
       cin=new BufferedReader(new InputStreamReader(client.getInputStream()));
       cout=new PrintWriter(client.getOutputStream(),true);
       
       cout.println("jhkh");
       receiver("连接 "+cin.readLine());
       String aline="";
       do
       {
       aline=cin.readLine();
       if(aline!=null&&!aline.equals("bye"))
           receiver(aline);
       }while(aline!=null&&!aline.equals("bye"));
       
       cout=null;
       cin.close();
       cout.close();
       client.close();
       }
    catch(IOException e){try{
       server=new ServerSocket(2001);
       client=server.accept();
       cin=new BufferedReader(new InputStreamReader(client.getInputStream()));
       cout=new PrintWriter(client.getOutputStream(),true);
       
       cout.println("kjlj");
       receiver("连接 "+cin.readLine());
       
       String aline="";
       do
       {
       aline=cin.readLine();
       if(aline!=null&&!aline.equals("bye"))           receiver(aline);
       }while(aline!=null&&!aline.equals("bye"));
       
       cout=null;
       cin.close();
       cout.close();
       client.close();
       server.close();
       }
    catch(IOException ee){}
    finally{}
}
    finally{}
}public  void receiver(String message){
jtextarea0.append(message+"\r\n");}public void actionPerformed(ActionEvent e){
 
if(e.getActionCommand()=="断开"){dk();}
if(e.getActionCommand()=="发送"){fs();}}
public void dk(){
if(this.cout!=null){
this.cout.println(name+"断开");
this.cout.println("bye");
this.cout=null;
}
jtextarea0.append("我离线\n");
}
public void fs(){
if(this.cout!=null){
this.cout.println(name+"说"+jtextarea1.getText());
jtextarea0.append("我说:"+jtextarea1.getText()+"\n");
jtextarea1.setText("");
}else{
jtextarea0.append("已断开,不能发送消息!!!\n");
}}}
public static void main(String args[]){
new Chat();
}}

Answer 3

client=new Socket((String)jcombobox0.getSelectedItem(),2001); 
它会去尝试连localhost(这个程序中),此时server端还没有初始化，因此这句话后面的也不会执行了，包括server端初始化代码，JDialog0 的初始化工作就阻塞在上面这句话了。你把client和server做成两个线程初始化JDialog0后启动这两个线程

Answer 4

我来试一下，你java不错啊一下就可以看出来了

Answer 5

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;public class Test extends JFrame implements ActionListener { private String[] name = { "localhost" }; private JComboBox jcombobox4; private JButton jbutton_lj; private JDialog0 dialog1; public Test() { super("fdfd");
setLocation(0, 0);
setSize(400, 400);
setLayout(new FlowLayout());
jcombobox4 = new JComboBox(name);
jbutton_lj = new JButton("连接");
add(jcombobox4);
add(jbutton_lj);
jbutton_lj.addActionListener(this);
setDefaultCloseOperation(3); setVisible(true); } public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("连接")) {
if (dialog1 == null)
dialog1 = new JDialog0(this);
dialog1.jdialog0.setVisible(true);
} } class JDialog0 implements ActionListener { public JDialog jdialog0;
public JPanel jpanel0, jpanel1;
public JPanel jpanel2, jpanel7;
public JTextArea jtextarea0, jtextarea1;
public JButton jbutton_dk, jbutton_fs;
public JPanel jpanel3, jpanel4, jpanel5;
public JButton jbutton_sx, jbutton_lj;
public JComboBox jcombobox0, jcombobox1;
public JLabel jlabel0;
public JTextArea jtextarea_empoty;
public JPanel jpanel6;
public JButton jbutton_save, jbutton_vido;
private ServerSocket server;
private Socket client;
private BufferedReader cin;
private PrintWriter cout;
String name; public JDialog0(Test chat) {
jdialog0 = new JDialog(chat, "dddfd", true);
jdialog0.setSize(500, 500);
jdialog0.setLocation(0, 0); jpanel0 = new JPanel(new BorderLayout());
jtextarea0 = new JTextArea(4000, 100);
jpanel0.add(new JScrollPane(jtextarea0), "Center"); jpanel2 = new JPanel(new BorderLayout());
jtextarea1 = new JTextArea(6, 30);
jpanel2.add(new JScrollPane(jtextarea1), "Center"); jpanel7 = new JPanel(new GridLayout(2, 1));
jbutton_dk = new JButton("发送");
jbutton_fs = new JButton("断开");
jpanel7.add(jbutton_fs);
jpanel7.add(jbutton_dk);
jpanel2.add(jpanel7, "East");
jpanel0.add(jpanel2, "South");
jdialog0.add(jpanel0, "Center"); String str0[] = { "localhost", "fdfd", "dfd" };
String[] str1 = { "dfdf", "fdd", "dfd" };
jpanel1 = new JPanel(new BorderLayout());
jpanel3 = new JPanel(new GridLayout(2, 1));
jpanel4 = new JPanel(new BorderLayout());
jpanel5 = new JPanel(new FlowLayout(2));
jbutton_sx = new JButton("刷新");
jcombobox0 = new JComboBox(str0);
jbutton_lj = new JButton("连接");
jpanel4.add(jbutton_sx, "West");
jpanel4.add(jcombobox0, "Center");
jpanel4.add(jbutton_lj, "East");
jpanel3.add(jpanel4); jlabel0 = new JLabel("状态");
jcombobox1 = new JComboBox(str1);
jpanel5 = new JPanel();
jpanel5.add(jlabel0);
jpanel5.add(jcombobox1);
jpanel3.add(jpanel5);
jpanel1.add(jpanel3, "North"); jtextarea_empoty = new JTextArea();
jtextarea_empoty.setEditable(false);
jpanel1.add(jtextarea_empoty, "Center"); jpanel6 = new JPanel(new GridLayout(1, 2));
jbutton_save = new JButton("保存聊天记录");
jbutton_vido = new JButton("音码");
jpanel6.add(jbutton_save);
jpanel6.add(jbutton_save);
jpanel6.add(jbutton_vido);
jpanel1.add(jpanel6, "South");
jpanel1.setSize(84, 500);
jdialog0.add(jpanel1, "East"); jdialog0.setDefaultCloseOperation(1); jbutton_fs.addActionListener(this);
jbutton_dk.addActionListener(this); name = "dfdfd";
startChat();
} public void startChat() {
Thread th1 = new Thread(new Runnable() { public void run() {
try {
client = new Socket((String) jcombobox0
.getSelectedItem(), 2001);
cin = new BufferedReader(new InputStreamReader(client
.getInputStream()));
cout = new PrintWriter(client.getOutputStream(), true); receiver("连接 " + cin.readLine());
String aline = "";
do {
aline = cin.readLine();
if (aline != null && !aline.equals("bye")) receiver(aline);
} while (aline != null && !aline.equals("bye")); cout = null;
cin.close();
cout.close();
client.close();
} catch (IOException e) {
}
} });
Thread th2 = new Thread(new Runnable() { public void run() {
try {
server = new ServerSocket(2001);
client = server.accept();
cin = new BufferedReader(new InputStreamReader(client
.getInputStream()));
cout = new PrintWriter(client.getOutputStream(), true);
receiver("连接 " + cin.readLine()); String aline = "";
do {
aline = cin.readLine();
if (aline != null && !aline.equals("bye")) receiver(aline);
} while (aline != null && !aline.equals("bye")); cout = null;
cin.close();
cout.close();
client.close();
server.close();
} catch (IOException ee) {
} finally {
}
} });
th1.start();
th2.start(); } public void receiver(String message) {
jtextarea0.append(message + "\r\n"); } public void actionPerformed(ActionEvent e) { if (e.getActionCommand() == "断开") {
dk();
}
if (e.getActionCommand() == "发送") {
fs();
} } public void dk() {
if (this.cout != null) {
this.cout.println(name + "断开");
this.cout.println("bye");
this.cout = null;
}
jtextarea0.append("我离线\n");
} public void fs() {
if (this.cout != null) {
this.cout.println(name + "说" + jtextarea1.getText());
jtextarea0.append("我说:" + jtextarea1.getText() + "\n");
jtextarea1.setText("");
} else {
jtextarea0.append("已断开,不能发送消息!!!\n");
} } } public static void main(String args[]) {
new Test();
}}不要光看代码，要看看一些编程的规范，。呵呵，好好学习天天向上

Answer 6

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;public class Test extends JFrame implements ActionListener {    private String[] name = { "localhost" };    private JComboBox jcombobox4;    private JButton jbutton_lj;    private JDialog0 dialog1;    public Test() {        super("fdfd");
        setLocation(0, 0);
        setSize(400, 400);
        setLayout(new FlowLayout());
        jcombobox4 = new JComboBox(name);
        jbutton_lj = new JButton("连接");
        add(jcombobox4);
        add(jbutton_lj);
        jbutton_lj.addActionListener(this);
        setDefaultCloseOperation(3);        setVisible(true);    }    public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals("连接")) {
            if (dialog1 == null)
                dialog1 = new JDialog0(this);
            dialog1.jdialog0.setVisible(true);
        }    }    class JDialog0 implements ActionListener {        public JDialog jdialog0;
        public JPanel jpanel0, jpanel1;
        public JPanel jpanel2, jpanel7;
        public JTextArea jtextarea0, jtextarea1;
        public JButton jbutton_dk, jbutton_fs;
        public JPanel jpanel3, jpanel4, jpanel5;
        public JButton jbutton_sx, jbutton_lj;
        public JComboBox jcombobox0, jcombobox1;
        public JLabel jlabel0;
        public JTextArea jtextarea_empoty;
        public JPanel jpanel6;
        public JButton jbutton_save, jbutton_vido;
        private ServerSocket server;
        private Socket client;
        private BufferedReader cin;
        private PrintWriter cout;
        String name;        public JDialog0(Test chat) {
            jdialog0 = new JDialog(chat, "dddfd", true);
            jdialog0.setSize(500, 500);
            jdialog0.setLocation(0, 0);            jpanel0 = new JPanel(new BorderLayout());
            jtextarea0 = new JTextArea(4000, 100);
            jpanel0.add(new JScrollPane(jtextarea0), "Center");            jpanel2 = new JPanel(new BorderLayout());
            jtextarea1 = new JTextArea(6, 30);
            jpanel2.add(new JScrollPane(jtextarea1), "Center");            jpanel7 = new JPanel(new GridLayout(2, 1));
            jbutton_dk = new JButton("发送");
            jbutton_fs = new JButton("断开");
            jpanel7.add(jbutton_fs);
            jpanel7.add(jbutton_dk);
            jpanel2.add(jpanel7, "East");
            jpanel0.add(jpanel2, "South");
            jdialog0.add(jpanel0, "Center");            String str0[] = { "localhost", "fdfd", "dfd" };
            String[] str1 = { "dfdf", "fdd", "dfd" };
            jpanel1 = new JPanel(new BorderLayout());
            jpanel3 = new JPanel(new GridLayout(2, 1));
            jpanel4 = new JPanel(new BorderLayout());
            jpanel5 = new JPanel(new FlowLayout(2));
            jbutton_sx = new JButton("刷新");
            jcombobox0 = new JComboBox(str0);
            jbutton_lj = new JButton("连接");
            jpanel4.add(jbutton_sx, "West");
            jpanel4.add(jcombobox0, "Center");
            jpanel4.add(jbutton_lj, "East");
            jpanel3.add(jpanel4);            jlabel0 = new JLabel("状态");
            jcombobox1 = new JComboBox(str1);
            jpanel5 = new JPanel();
            jpanel5.add(jlabel0);
            jpanel5.add(jcombobox1);
            jpanel3.add(jpanel5);
            jpanel1.add(jpanel3, "North");            jtextarea_empoty = new JTextArea();
            jtextarea_empoty.setEditable(false);
            jpanel1.add(jtextarea_empoty, "Center");            jpanel6 = new JPanel(new GridLayout(1, 2));
            jbutton_save = new JButton("保存聊天记录");
            jbutton_vido = new JButton("音码");
            jpanel6.add(jbutton_save);
            jpanel6.add(jbutton_save);
            jpanel6.add(jbutton_vido);
            jpanel1.add(jpanel6, "South");
            jpanel1.setSize(84, 500);
            jdialog0.add(jpanel1, "East");            jdialog0.setDefaultCloseOperation(1);            jbutton_fs.addActionListener(this);
            jbutton_dk.addActionListener(this);            name = "dfdfd";
            startChat();
        }        public void startChat() {
            Thread th1 = new Thread(new Runnable() {                public void run() {
                    try {
                        client = new Socket((String) jcombobox0
                                .getSelectedItem(), 2001);
                        cin = new BufferedReader(new InputStreamReader(client
                                .getInputStream()));
                        cout = new PrintWriter(client.getOutputStream(), true);                        receiver("连接 " + cin.readLine());
                        String aline = "";
                        do {
                            aline = cin.readLine();
                            if (aline != null && !aline.equals("bye"))                                receiver(aline);
                        } while (aline != null && !aline.equals("bye"));                        cout = null;
                        cin.close();
                        cout.close();
                        client.close();
                    } catch (IOException e) {
Thread th2 = new Thread(new Runnable() {                public void run() {
                    try {
                        server = new ServerSocket(2001);
                        client = server.accept();
                        cin = new BufferedReader(new InputStreamReader(client
                                .getInputStream()));
                        cout = new PrintWriter(client.getOutputStream(), true);
                        receiver("连接 " + cin.readLine());                        String aline = "";
                        do {
                            aline = cin.readLine();
                            if (aline != null && !aline.equals("bye"))                                receiver(aline);
                        } while (aline != null && !aline.equals("bye"));                        cout = null;
                        cin.close();
                        cout.close();
                        client.close();
                        server.close();
                    } catch (IOException ee) {
                    } finally {
                    }
                }            });th2.start();
                    }
                }            });
            
            th1.start();
                    }        public void receiver(String message) {
            jtextarea0.append(message + "\r\n");        }        public void actionPerformed(ActionEvent e) {            if (e.getActionCommand() == "断开") {
                dk();
            }
            if (e.getActionCommand() == "发送") {
                fs();
            }        }        public void dk() {
            if (this.cout != null) {
                this.cout.println(name + "断开");
                this.cout.println("bye");
                this.cout = null;
            }
            jtextarea0.append("我离线\n");
        }        public void fs() {
            if (this.cout != null) {
                this.cout.println(name + "说" + jtextarea1.getText());
                jtextarea0.append("我说:" + jtextarea1.getText() + "\n");
                jtextarea1.setText("");
            }            else {
                jtextarea0.append("已断开,不能发送消息!!!\n");
            }        }    }    public static void main(String args[]) {
        new Test();
    }}