没人啊

你还没到那一步...先把基础打好了再看

我的作业就是写这个东东

发来看看

kage com.yidu._6;import java.awt.*;
import java.awt.event.*;
import java.util.EventListener;
import java.io.*;
import javax.swing.JComboBox;
import java.net.*;
import java.awt.event.ItemListener;
public class Client extends Frame implements ActionListener, ItemListener {
// 窗体应该有发送按钮、文本框用来输入东西、List列表用来显示信息 Button connectbutton = new Button("连接");
Button sendbutton = new Button("发送"); List list = new List();
TextField content = new TextField(20);
TextField servername = new TextField(20);
Label label = new Label("输入服务器名字：");
JComboBox jComboBox1 = new JComboBox(); Socket socket;
String ren = ""; public Client() { sendbutton.addActionListener(this);
connectbutton.addActionListener(this);
jComboBox1.addItemListener(this);
Panel p1 = new Panel();
p1.add(label);
p1.add(servername);
p1.add(connectbutton); Panel p2 = new Panel();
p2.add(jComboBox1);
p2.add(content);
p2.add(sendbutton); Panel p3 = new Panel();
p3.setLayout(new BorderLayout()); p3.add("South", p2);
p3.add(list); this.add("South", p1);
this.add("Center", p3); this.setSize(400, 400);
this.jComboBox1.addItem("所有人");
setDefaultCloseOperation(3); } private void setDefaultCloseOperation(int i) {
// TODO Auto-generated method stub
} public void actionPerformed(ActionEvent e) {
if (e.getSource() == connectbutton) {
if (!servername.getText().equals("")) {
try {
String fuwuqi = servername.getText();
socket = new Socket(fuwuqi, 9000);
new CInputStream(socket.getInputStream()).start();
PrintWriter pw = new PrintWriter(socket.getOutputStream(),
true);
pw.println("CLogin:");
this.connectbutton.setEnabled(false);
this.servername.setText("");
} catch (IOException ex2) {
ex2.printStackTrace();
}
} else { javax.swing.JOptionPane.showMessageDialog(null,"请输入要连接的服务器名称");
} } else {
try {
PrintWriter pw = new PrintWriter(socket.getOutputStream(), true);
String shuo = content.getText(); System.out.println("ren" + ren);
if (ren.equals("所有人")) {
pw.println("CAll:" + this.getTitle() + "-" + ren + "="
+ shuo); this.list.add("你对" + ren + "说" + shuo);
System.out.println("CAll:" + this.getTitle() + "-" + ren
+ "=" + shuo);
} else {
pw.println("COne:" + this.getTitle() + "-" + ren + "="
+ shuo);
this.list.add("你对" + ren + "说:" + shuo);
System.out.println("Cone"
+ "__________________________________");
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
} public void itemStateChanged(ItemEvent e) {
ren = (String) jComboBox1.getSelectedItem();
} public static void main(String[] args) { Client c = new Client();
QQClient.f = c;
c.show();


}
}class QQClient {
public static Client f;
}
package com.yidu._6;
import java.io.*;
import java.net.*;
import java.util.*;
public class Server {
public Server(){
}
public static void main(String[] args) {
Hashtable ht=new Hashtable();
try{
ServerSocket ss=new ServerSocket(9000);
int num=0;
while(true){
Socket s=ss.accept();
String username=""+num;
num++;
ht.put(username,s);
new ServerInputThread(s.getInputStream(),username,ht).start();
System.out.println(username+"已登陆"); }
}catch(Exception e){System.out.println(e);} }
}
//服务器输入流线程
class ServerInputThread extends Thread{
InputStream in; String ren;
public ServerInputThread(InputStream in,String tmpusername,Hashtable ht){
this.in = in;
this.ren = tmpusername;
Ssend.send=new send(ht);
} public void run(){
BufferedReader bf=new BufferedReader(new InputStreamReader(in));
try{
while(true){
String str=bf.readLine();
System.out.println(str);
String cxiaoxi=str.substring(0,str.indexOf(":"));
System.out.println(cxiaoxi);
if(cxiaoxi.equals("CLogin")){
Ssend.send.sendOne(ren,"SOneLogin:");
System.out.println("------------------");
Ssend.send.sendAll("SAllLogin:"+ren);
String zaixian=Ssend.send.Zaixian();
Ssend.send.sendOne(ren,"ZaiXian:"+zaixian);
System.out.println("++++++++++++"+zaixian);
}
if(cxiaoxi.equals("COne")){
String s1=str.substring(str.indexOf(":")+1);
String s2=s1.substring(0,s1.indexOf("="));
String s3=s1.substring(s1.indexOf("=")+1);
String s4=s2.substring(0,s2.indexOf("-"));
String s5=s2.substring(s2.indexOf("-")+1);
Ssend.send.sendOne(s5,"SOne:"+s4+">"+s3);
}
if(cxiaoxi.equals("CAll")){
String s1=str.substring(str.indexOf(":")+1);
String s2=s1.substring(0,s1.indexOf("="));
String s3=s1.substring(s1.indexOf("=")+1);
String s4=s2.substring(0,s2.indexOf("-"));
String s5=s2.substring(s2.indexOf("-")+1);
Ssend.send.sendAll("SAll:"+s4+">"+s3);
}
} }catch(Exception e){System.out.println(e);}
}}
class send{
Hashtable ht;
public send(Hashtable ht){
this.ht=ht;


} public void sendOne(String username,String message){
Socket s=(Socket)ht.get(username);
if(s==null){
System.out.println("socket为空");
}
else
{
try{
PrintWriter pw=new PrintWriter(s.getOutputStream(),true);
pw.println(username+"="+message);
System.out.println(username+"="+message);
}catch(Exception e){System.out.println(e);} } }
public void sendAll(String message){
Enumeration em=ht.keys();
try{
while(em.hasMoreElements()){
String name=(String)em.nextElement();
//System.out.println(name+"name");
Socket socket=(Socket)ht.get(name);
PrintWriter pw=new PrintWriter(socket.getOutputStream(),true);
pw.println("="+message); }
}catch(Exception e){System.out.println(e);}
}
public String Zaixian(){
Enumeration em=ht.keys(); String zaixian="";
while(em.hasMoreElements()){
String name=(String)em.nextElement();
zaixian=zaixian+name+";";
}
return zaixian;
}
}
class Ssend{
public static send send;
}
package com.yidu._6;import java.io.*;
import java.net.*;
class CInputStream extends Thread {
InputStream in; public CInputStream(InputStream in) {
this.in = in;
} public void run() {
BufferedReader buff = new BufferedReader(new InputStreamReader(in));
while (true) {
String s = null;
try {
s = buff.readLine();
System.out.println(s);
} catch (IOException ex) {
}
String sd = s.substring(s.indexOf("=") + 1);
System.out.println(sd + "aaaaaaaaaaaaaaaaa");
String ss = sd.substring(0, sd.indexOf(":"));
System.out.println(ss + "bbbbbbbbbbbbb");
if (ss.equals("SOneLogin")) {
String sss = s.substring(0, s.indexOf("="));
System.out.println(sss + "=============");
QQClient.f.setTitle(sss);
System.out.println(sss);
QQClient.f.list.add(sss + "登录成功");
}
if (ss.equals("SAllLogin")) {
String zaixian = sd.substring(sd.indexOf(":") + 1);
System.out.println(zaixian + "-------------");
String title = QQClient.f.getTitle();
System.out.println("title" + title);
if (!zaixian.equals(title)) {
QQClient.f.jComboBox1.addItem(zaixian);
QQClient.f.list.add(zaixian + "已登录");
}
}
if (ss.equals("ZaiXian")) {
String xian = sd.substring(sd.indexOf(":") + 1);
String tmp[] = xian.split(";");
for (int i = 0; i < tmp.length; i++) {
if (!tmp[i].equals(QQClient.f.getTitle())) {
QQClient.f.jComboBox1.addItem(tmp[i]);
QQClient.f.list.add(tmp[i] + "已登录");
}
}
} if (ss.equals("SOne")) {
String xiaoxi = s.substring(s.indexOf(":") + 1);
System.out.println("Sone" + xiaoxi);
String s0 = xiaoxi.substring(0, xiaoxi.indexOf(">"));
String str = s.substring(s.indexOf(">") + 1);
QQClient.f.list.add(s0 + "对您说" + ":" + str);
}
if (ss.equals("SAll")) {
String xiaoxi = s.substring(s.indexOf(":") + 1);
String str = s.substring(s.indexOf(">") + 1);
String s1 = xiaoxi.substring(0, xiaoxi.indexOf(">"));
QQClient.f.list.add(s1 + "对所有人说" + "====" + str); }
}
}}
看不很懂，老师要我们自己弄这个。

...你确定你只教到面向对象?!那些用到的类教你了吗?多线程教了吗?还是你们面向对象是在最后教的的?

都学了点基础知识，就讲了两张PPT==

LZ老师牛。。就讲两张PPT，给这程序

一直在研究，就没看懂过