未完成

import java.awt.*;import java.awt.event.*;import java.applet.*;public class BeiJing extends Applet{Panel panenl1=new Panel();TextArea textArea1=new TextArea();Label label1=new Label("我是北京，向上海发消息：");TextField textField1=new TextField();Button button1=new Button("发送");GridLayout gridLayout1=new GridLayout();Panel panel2=new Panel();TextArea textArea=new TextArea();Label label2=new Label("我是上海，向北京发消息：");TextField textField2=new TextField();Button button2=new Button("发送");GridLayout gridLayout2=new GridLayout();public void init(){this.setLayout(gridLayout1);textArea1.setColumns(20);textArea1.setRows(1);textArea1.setText("从上海收到的消息：\n");button1.addActionListener(new java.awt.event.ActionListener(){public void actionPerformed(ActionEvent e){button1_actionPerformed(e);}});}}