java程序 留言板.doc

import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.lang.*;public class Test51 Frame f;TextArea center;Label la1,la2,la3;Panel east,south,north;Button b1,b2,b3,b4;Choice l1;TextField t1;public static void main(String args)Test51 mb = new Test51();mb.go(); private void go() f = new Frame(留言版程序); f.addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent evt) f.setVisible(false); System.exit(0); ); f.setBounds(0,0,600,400); f.setLayout(new BorderLayout(); f.setResizable(false); north = new Panel(); south = new Panel(); east = new Panel(); center = new TextArea(留言内容：); center.setEditable(false); b1 = new Button(清屏); b2 = new Button(至顶); b3 = new Button(至尾); la1 = new Label(留言版); la2 = new Label(你); la3 = new Label( 地说:); t1 = new TextField(20); b4 = new Button(提交); l1 =new Choice(); l1.add(微笑 ); l1.add(生气 ); l1.add(伤心 ); f.add(BorderLayout.NORTH,north); f.add(BorderLayout.SOUTH,south); f.add(BorderLayout.EAST,east); f.add(BorderLayout.CENTER,center); north.add(BorderLayout.CENTER,la1); south.add(la2); south.add(l1); south.add(la3); south.add(t1); south.add(b4); east.setLayout(new GridLayout(9,0,1,10); east.add(b1); east.add(b2); east.add(b3); f.setVisible(true); b4.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String text1,text2; text1 = l1.getSelectedItem(); text2 = t1.getText(); t1.setText(null); if(t1.getText() != ) center.append(n); center.append(text1); center.append(text2); ); b1.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) center.setText(留言内容:); ); b2.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) center.requestFocusInWindow(); center.setCaretPosition(8); ); b3.addActionListener(new ActionListener() public void actionPerformed(Actio