关于Java的聊天程序（功能未完成），为什么服务端和客户端启动会抛异常？我不希望它抛异常 ，程序没错误

Question

服务端：

 package cheat;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.Button;
import java.awt.event.*;
public class CheatServer {
    public static void main(String[] args) {
        new MyFrame("服务端");
    }
}
class MyFrame extends Frame{
    static boolean judge=true;
    MyFrame(String s){
        super(s);
        this.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                setVisible(false);
                System.exit(0);
            }
        });
        setLayout(new BorderLayout());
        setBounds(200,200,250,300);
        TextArea tr=new TextArea();
        tr.setEditable(true);
        Button b=new Button("终止");
        Panel p=new Panel();
        p.setLayout(new FlowLayout(FlowLayout.CENTER));
                try {
                    ServerSocket ss=new ServerSocket(8888);
                    while(judge){
                        Socket s1=ss.accept();
                        tr.append("用户接入成功！"+" ");

                    }
                } catch (IOException er) {
                    tr.setText("服务出错！"+" ");//       为何跑出？
                }
        b.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ee){
                judge=false;
                tr.setText("服务终止");
            }
        });
        p.add(b);
        add("North",tr);
        add("South",p);
        setVisible(true);
    }
}

客户端：

 package cheat;
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Button;
public class CheatClent{
    public static void main(String[] args){
        new MyFreame("客户端");
    }
}
class MyFreame extends Frame{
    MyFreame(String s){
        super(s);
        setBounds(200,200,400,500);
        setLayout(new BorderLayout());
        TextArea tr=new TextArea();
        tr.setEditable(false);
        TextField tf=new TextField();
        add("North",tr);
        add("South",tf);
        this.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                setVisible(false);
                System.exit(0);
            }
        });
        setVisible(true);
        try {
            Socket client=new Socket("127.0.0.1",8888);
        } catch (IOException er) {
            tr.setText("连接出错！");//      为何跑出？
        }
    }
}

Answer 1

            程序功能确实不全，出现连接错误主要是因为你的运行步骤出错了，应该先运行服务器端，创建了8888端口的serversocket,再运行客户端，

才能连接上8888端口，这样就不会出错了。