菜鸟有问题，高手过来拣分呀。。。。。。

我把代码写出来，大家帮忙看看好吗！？不够可以加分的。谢谢了
下面是登陆窗口
package rmi;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.*;/**
* Title:输入用户名的窗口 
* Description: 
* Copyright: Copyright (c) 2003
* Company: 
* @author unascribed
* @version 1.0
*/public class textField extends JFrame { public textField()
 {JFrame t = new rTeachWindow();
 t.addWindowListener(new WindowAdapter() {
 public void windowClosing(WindowEvent e) {
 System.exit(0);
 }
 });
 t.show();
 String title = "loginWindow";
 String message = "Please enter your name!!!";
 int messageType = JOptionPane.DEFAULT_OPTION;
 String name = "";
 String name2 = "";
 int optionType = JOptionPane.DEFAULT_OPTION;
 int messageType2 = JOptionPane.WARNING_MESSAGE;
 //String result = "";
 name = JOptionPane.showInputDialog(t,message,title,messageType);
 int input = name.compareTo("student");
if (input == 0){
 //输入正确后该做的代码;
}
else if(name == null){
 System.exit(0);//按取消键退出；
}
else {//输入不正确的循环代码；
for (int i = 2;i > 0; i--)
{name2 = JOptionPane.showInputDialog(t,"Error.Please enter again!!!",title,messageType);
int input2 = name2.compareTo("student");
if (input2 == 0){
 //输入正确后该做的代码;
 break;
}
else if(name2 == null){
 System.exit(0);//按取消键退出；
 break;
}
else if (i == 1){ JOptionPane.showConfirmDialog(t,"Error for three times!!!",title,optionType,messageType2);
System.exit(0);//三次错误出现警告窗口
}
else {
 continue;
}
} }
}
}

解决方案 »

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下面是基层的窗口，是个写字板：
package rmi;/**
* Title:远程教学的用户视图
* Description: 教学白板
* Copyright: Copyright (c) 2003
* Company: 
* @author unascribed
* @version 1.0
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.undo.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.io.*;
import java.util.*;public class rTeachWindow extends JFrame implements UndoableEditListener,DocumentListener, Serializable, MenuListener{ private UndoableEdit edit;
 JTextArea jta;
 private JMenuItem Undo;
 private JMenuItem Redo;
 private JMenuItem Cut;
 private JMenuItem Copy;
 private JMenuItem Paste;
 private JMenuItem Exit;
 private JMenuItem About;
 public rTeachWindow(){ super("TeachWindow");
 jta = new JTextArea();
 jta.getDocument().addUndoableEditListener(this);
 jta.getDocument().addDocumentListener(this);
 //String text = jta.getText(); JPanel p1 = new JPanel();
 p1.setLayout(new GridLayout(1,1));
 p1.add(new JScrollPane(jta)); getContentPane().add(p1); JMenuBar bar = new JMenuBar();
 JMenu theMenu2 = new JMenu("File");
 JMenu theMenu = new JMenu("Edit");
 JMenu theMenu3 = new JMenu("Help");
 Cut = new JMenuItem("Cut");
 Copy = new JMenuItem("Copy");
 Paste = new JMenuItem("Paste");
 Undo = new JMenuItem("Undo");
 Redo = new JMenuItem("Redo");
 Exit = new JMenuItem("Exit");
 About = new JMenuItem("About");
 theMenu.add(Undo);
 theMenu.add(Redo);
 theMenu.addSeparator();
 theMenu.add(Cut);
 theMenu.add(Copy);
 theMenu.add(Paste);
 theMenu2.add(Exit);
 theMenu3.add(About); bar.add(theMenu2);
 bar.add(theMenu);
 bar.add(theMenu3);
 updateMenuItem(); setJMenuBar(bar);
 setSize(300,300);
 Redo.setAccelerator(javax.swing.KeyStroke.getKeyStroke(90, java.awt.event.KeyEvent.CTRL_MASK | java.awt.event.KeyEvent.SHIFT_MASK, false));
 Undo.setAccelerator(javax.swing.KeyStroke.getKeyStroke(90, java.awt.event.KeyEvent.CTRL_MASK, false));
 Cut.setNextFocusableComponent(jta);
 Cut.setText("Cut");
 Cut.setAccelerator(javax.swing.KeyStroke.getKeyStroke(88, java.awt.event.KeyEvent.CTRL_MASK, false));
 Cut.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(ActionEvent e) {
 Cut_actionPerformed(e);
 }
 });
 Copy.setNextFocusableComponent(jta);
 Copy.setAccelerator(javax.swing.KeyStroke.getKeyStroke(67, java.awt.event.KeyEvent.CTRL_MASK, false));
 Copy.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
Copy_actionPerformed(e);
}
 });
 Paste.setNextFocusableComponent(jta);
 Paste.setAccelerator(javax.swing.KeyStroke.getKeyStroke(86, java.awt.event.KeyEvent.CTRL_MASK, false));
 Paste.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(ActionEvent e) {
 Paste_actionPerformed(e);
 }
 });
 Exit.setAccelerator(javax.swing.KeyStroke.getKeyStroke(69, java.awt.event.KeyEvent.CTRL_MASK, false));
 Exit.addActionListener(new java.awt.event.ActionListener() {
 public void actionPerformed(ActionEvent e) {
 Exit_actionPerformed(e);
 }
 }); Undo.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent ev){
 edit.undo();
 updateMenuItem(); }
 }); Redo.addActionListener(new ActionListener(){
 public void actionPerformed(ActionEvent ev){
 edit.redo();
 updateMenuItem(); }
 });
 }//end of JTextArea5() public void undoableEditHappened(UndoableEditEvent ev){
 StringBuffer buf = new StringBuffer(50);
 edit = ev.getEdit();
 buf.append("undoableEdit:");
 buf.append(edit.getPresentationName());
 buf.append("\n"); updateMenuItem();
 }//end of undoableEditHappened() public void updateMenuItem(){ if (edit != null){
 Undo.setEnabled(edit.canUndo());
 Redo.setEnabled(edit.canRedo());
 Undo.setText(edit.getUndoPresentationName());
 Redo.setText(edit.getRedoPresentationName());
 }else{
 Undo.setEnabled(false);
 Redo.setEnabled(false);
 Undo.setText("Undo");
 Redo.setText("Redo");
 }
 }//end of updateMenu() public void showDE(DocumentEvent de){
 StringBuffer debuf = new StringBuffer(100);
 debuf.append(de.getType());
 debuf.append(" Offset:");
 debuf.append(de.getOffset());
 debuf.append(" Length:");
 debuf.append(de.getLength()); Element Eroot = jta.getDocument().getDefaultRootElement();
 DocumentEvent.ElementChange Echange = de.getChange(Eroot);
 if (Echange == null){
 debuf.append(" (No Element Change)");
 }else{
 debuf.append(" Element Change: index ");
 debuf.append(Echange.getIndex());
 /* debuf.append(" ,Added Length:");
 debuf.append(Echange.getChildrenAdded().length);
 debuf.append(" ,Removed Length:");
 debuf.append(Echange.getChildrenRemoved().length);
 debuf.append(" ,=> ");
 debuf.append(Echange.getElement());
 */
 }
 debuf.append("\n"); }//end of showDE() public void changedUpdate(DocumentEvent de){
 showDE(de);
 } public void insertUpdate(DocumentEvent de){
 showDE(de);
 } public void removeUpdate(DocumentEvent de){
 showDE(de);
 } public static void main(String args[]) { JFrame f = new textField();
 f.addWindowListener(new WindowAdapter() {
 public void windowClosing(WindowEvent e) {
 System.exit(0);
 }
 });
 f.show();
 }
 private void writeObject(ObjectOutputStream oos) throws IOException {
 oos.defaultWriteObject();
 }
 private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException {
 ois.defaultReadObject();
 }
 public void menuSelected(MenuEvent e) {
 }
 public void menuDeselected(MenuEvent e) {
 }
 public void menuCanceled(MenuEvent e) {
 }
 void Cut_actionPerformed(ActionEvent e) {
if (e.getSource() == Cut)
{
jta.cut();
}
 }
 void Copy_actionPerformed(ActionEvent e) {
if (e.getSource() == Copy)
{
jta.copy();
}
 }
 void Paste_actionPerformed(ActionEvent e) {
 if (e.getSource() == Paste)
 {
 jta.paste();
}
 }
 void Exit_actionPerformed(ActionEvent e) {
System.exit(0);
 }
 public JTextArea getJta() {
 return jta;
 }
 public void setJta(JTextArea jta) {
 this.jta = jta;
 }/////////end of main()}//end of class rTeachWindow
问题是我按取消按钮总是不能全部推出，留下基层窗口。还有就是输入了student，会同时显示两个窗口，为什么呢？！^_^
我是新手，大侠们帮帮忙了^_^