Intermediate Java(39) - GUI for Your Instant Messenger

import java.io.*;

import java.net.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Server extends JFrame {

private JTextField userText;

private JTextArea chatwindow;

private ObjectOutputStream output;

private ObjectInputStream input;

private ServerSocket server;

private Socket connection;

//constructor

public Server(){

super("My Awesome Instant Messenger");

userText = new JTextField();

userText.setEditable(false); → 設置false因為還尚未有客戶端連接,所以不能編輯

userText.addActionListener(

new ActionListener(){ → 當你從鍵盤輸入 Enter

public void actionPerformed(ActionEvent event){

sendMessage(event.getActionCommand()); → 從JTextField獲得String

userText.setText(""); → 因為你發送後String將清除,所以設置""

}

}

);

add(userText,BorderLayout.NORTH);

chatwindow = new JTextArea();

add(new JScrollPane(chatwindow));

setSize(400,200);

setVisible(true);

}

}