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谢谢请采纳：
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搜索‘珍惜知识网’点进去就是了[ORDA]
帮你改了一下：import java.awt.*
import java.awt.event.*
import javax.swing.*
public class logon extends JFrame {
public static void main(String args[]) {
logon a=new logon()
a.show()
}
CheckboxGroup ShenFen=new CheckboxGroup()
Checkbox ShenFen1
Checkbox ShenFen2
Checkbox ShenFen3
JButton LogonButton,Exit
JTextField id
JPasswordField password
public logon(){
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE)
this.setLayout(null)
setTitle("学生选课系统")
setSize(600,600)
ShenFen1=new Checkbox("学生",ShenFen,true)
ShenFen2=new Checkbox("教师",ShenFen,false)
ShenFen3=new Checkbox("管理员",ShenFen,false)
add(ShenFen1)
add(ShenFen2)
add(ShenFen3)
ShenFen1.setBounds(300, 350, 50, 50)
ShenFen2.setBounds(350, 350, 50, 50)
ShenFen3.setBounds(400, 350, 50, 50)
LogonButton=new JButton("登录")
add(LogonButton)
Exit=new JButton("退出")
add(Exit)
Exit.setBounds(400, 400,60, 60)
id=new JTextField()
add(id)
id.setBounds(300, 200, 200, 30)
password=new JPasswordField()
add(password)
password.setBounds(300, 250, 200, 30)
}
}
import java.awt.*import java.awt.event.*
import java.util.*
class p1 extends Panel
{
Label l1
Font f=new Font("宋体",Font.BOLD,20)
p1()
{
setLayout(new GridLayout(1,1))
l1=new Label("网上选课记录系统",Label.CENTER)
l1.setFont(f)
add(l1)
}
}
class p2 extends Panel
{
Label l1,l2
TextField t1,t2
p2()
{
setLayout(new GridLayout(1,4))
l1=new Label("姓名",Label.CENTER)
l2=new Label("学号",Label.CENTER)
t1=new TextField(10)
t2=new TextField(10)
add(l1)
add(t1)
add(l2)
add(t2)
}
}
class p3 extends Panel
{
Label l1,l2
TextField t1,t2
p3()
{
setLayout(new GridLayout(1,4))
l1=new Label("专业",Label.CENTER)
l2=new Label("所属院(系)",Label.CENTER)
t1=new TextField(10)
t2=new TextField(10)
add(l1)
add(t1)
add(l2)
add(t2)
}
}
class p4 extends Panel
{
Label l1
Button btn1
Button btn2
Button btn3
Font f=new Font("宋体",Font.BOLD,20)
p4()
{
setLayout(new GridLayout(1,4))
l1=new Label("请选择您要选修的课程并确认",Label.CENTER)
btn1=new Button("查询")
btn2=new Button("确认")
btn3=new Button("退出系统")
add(l1)
add(btn1)
add(btn2)
add(btn3)
}
}
class p5 extends Panel
{
List list
p5()
{
setLayout(new GridLayout(1,1))
list=new List(8,true)
list.add("大学英语")
list.add("计算机图形学")
list.add("JAVA语言")
list.add("高等数学")
list.add("数据结构")
list.add("单片机")
list.add("网络应用与开发")
list.add("概率论与数理统计")
list.add("管理学概论")
list.add("数据库概论")
list.add("英语听力")
list.add("VC++")
list.add("商务英语")
list.add("会计学")
list.add("经济学")
list.add("计算机网络")
add(list)
}
}
class p6 extends Panel
{
TextArea ta
p6()
{
setLayout(new GridLayout(1,1))
ta=new TextArea(8,30)
add(ta)
}
}
class p8 extends Panel
{
Label l1,l2,l3
Label l4,l5,l6,l7,l9
Panel p11,p22,p33,p44,p55
TextField t1,t2
Button btn
p8()
{
p11=new Panel()
p22=new Panel()
p33=new Panel()
p44=new Panel()
p55=new Panel()
p11.setLayout(new GridLayout(1,1))
p22.setLayout(new GridLayout(1,1))
p33.setLayout(new GridLayout(1,4))
p44.setLayout(new GridLayout(1,4))
p55.setLayout(new GridLayout(1,1))
l4=new Label("")
l5=new Label("")
l6=new Label("")
l7=new Label("")
l9=new Label("")
l1=new Label("欢迎来到网上选课系统",Label.CENTER)
Font f=new Font("宋体",Font.BOLD,30)
l1.setFont(f)
l2=new Label("请输入管理员帐号",Label.CENTER)
l3=new Label("请输入管理员密码",Label.CENTER)
setBackground(Color.lightGray)
btn=new Button("确定")
t1=new TextField(20)
t2=new TextField(15)
t2.setEchoChar(´*´)
l1.setForeground(Color.magenta)
t1.setBackground(Color.cyan)
t2.setBackground(Color.cyan)
t1.setForeground(Color.red)
t2.setForeground(Color.red)
l2.setForeground(Color.blue)
l3.setForeground(Color.blue)
p11.add(l1)
p22.add(l4)
p33.add(l5)
p33.add(l2)
p33.add(t1)
p33.add(l6)
p44.add(l7)
p44.add(l3)
p44.add(t2)
p44.add(btn)
p55.add(l9)
setLayout(new GridLayout(5,1))
add(p11)
add(p22)
add(p33)
add(p44)
add(p55)
}
}
class p9 extends Panel
{
p1 pn1=new p1()
p2 pn2=new p2()
p3 pn3=new p3()
p4 pn4=new p4()
p5 pn5=new p5()
p6 pn6=new p6()
p9()
{
setLayout(new GridLayout(6,1))
add(pn1)
add(pn2)
add(pn3)
add(pn4)
add(pn5)
add(pn6)
}
}
class user
{
String username
String sd
String major
String institute
String course
user(String x1,String x2,String x3,String x4,String x5)
{
username=x1
sd=x2
major=x3
institute=x4
course=x5
}
}
public class www
{
public static void main(String args[])
{
new m()
}
}
class m extends Frame implements ActionListener,ItemListener
{
StringBuffer ss=new StringBuffer("您好!您选修的课程有:")
Vector xiang=new Vector()
p9 pn9
p8 pn8
CardLayout cc=new CardLayout()
Button btn1
Dialog d1
m()
{
super("网上选课")
pn8=new p8()
pn9=new p9()
setLayout(cc)
add("one",pn8)
add("two",pn9)
btn1=new Button("确定")
pn9.pn1.l1.setBackground(Color.pink)
pn9.pn1.l1.setForeground(Color.blue)
pn9.pn2.l1.setBackground(Color.gray)
pn9.pn2.l1.setForeground(Color.orange)
pn9.pn2.l2.setBackground(Color.gray)
pn9.pn2.l2.setForeground(Color.orange)
pn9.pn3.l1.setBackground(Color.gray)
pn9.pn3.l1.setForeground(Color.orange)
pn9.pn3.l2.setBackground(Color.gray)
pn9.pn3.l2.setForeground(Color.orange)
pn9.pn2.t1.setForeground(Color.red)
pn9.pn2.t1.setBackground(Color.cyan)
pn9.pn2.t2.setForeground(Color.red)
pn9.pn2.t2.setBackground(Color.cyan)
pn9.pn3.t1.setForeground(Color.red)
pn9.pn3.t1.setBackground(Color.cyan)
pn9.pn3.t2.setForeground(Color.red)
pn9.pn3.t2.setBackground(Color.cyan)
pn9.pn5.list.setBackground(Color.pink)
pn9.pn5.list.setForeground(Color.blue)
pn9.pn6.ta.setBackground(Color.blue)
pn9.pn6.ta.setForeground(Color.white)
pn9.pn4.btn1.addActionListener(this)
pn9.pn4.btn2.addActionListener(this)
pn9.pn4.btn3.addActionListener(this)
pn9.pn5.list.addActionListener(this)
(pn9.pn5.list).addItemListener(this)
pn8.btn.addActionListener(this)
btn1.addActionListener(this)
setSize(650,400)
show()
}
public void actionPerformed(ActionEvent e)
{
xiang.addElement(new user("马先生","23597483","计算机","计算机系","单片机，数学"))
xiang.addElement(new user("杨先生","7899452","计算机","计算机系","单片机，数学"))
xiang.addElement(new user("董先生","7899452","计算机","计算机系","单片机，数学"))
xiang.addElement(new user("何先生","7899453","计算机","计算机系","单片机，数学"))
if(e.getSource()==pn8.btn)
{
String ss="123"
if(ss.compareTo(pn8.t1.getText())==0&&ss.compareTo(pn8.t2.getText())==0)
cc.show(this,"two")
else
{
d1=new Dialog(this,"警告",true)
Panel p1=new Panel()
p1.add(new Label("您无权进本系统!"))
d1.add("Center",p1)
Panel p2=new Panel()
p2.add(btn1)
d1.add("South",p2)
d1.setSize(200,100)
d1.show()
}
}
if(e.getSource()==btn1)
{
d1.dispose()
}
if(e.getSource()==pn9.pn4.btn3)
{
dispose()
System.exit(0)
}
if(e.getSource()==pn9.pn4.btn2)
{
pn9.pn6.ta.setText("")
ss.append(" 您的姓名是:"+pn9.pn2.t1.getText()+" "+"您的学号是:"+pn9.pn2.t2.getText()+" ")
ss.append("您的专业是:"+pn9.pn3.t1.getText()+" "+"您所在院(系)是:"+pn9.pn3.t2.getText()+" ")
ss.append("您的所有信息将被保存!")
pn9.pn6.ta.setText(ss.toString())
user s1=new user(pn9.pn2.t1.getText(),pn9.pn2.t2.getText(),pn9.pn3.t1.getText(),pn9.pn3.t2.getText(),ss.toString())
int i
for(i=0i<xiang.size()i++)
{
user s=(user)xiang.elementAt(i)
if(s.sd.compareTo(s1.sd)==0)
{
s.username=s1.username
s.sd=s1.sd
s.major=s1.major
s.institute=s1.institute
s.course=s1.course
xiang.setElementAt(new user(s.username,s.sd,s.major,s.institute,s.course),i)
break
}
}
if(i==xiang.size())
xiang.addElement(new user(pn9.pn2.t1.getText(),pn9.pn2.t2.getText(),pn9.pn3.t1.getText(),pn9.pn3.t2.getText(),ss.toString()))
}
if(e.getSource()==pn9.pn4.btn1)
{
pn9.pn6.ta.setText("")
if(pn9.pn2.t2.getText()=="")
{
d1=new Dialog(this,"注意",true)
Panel p1=new Panel()
p1.add(new Label("按学号进行查询!请输入学号!再按此键!"))
d1.add("Center",p1)
Panel p2=new Panel()
p2.add(btn1)
d1.add("South",p2)
d1.setSize(250,100)
d1.show()
}
int i
for(i=0i<xiang.size()i++)
{
user s=(user)xiang.elementAt(i)
if(s.sd.compareTo(pn9.pn2.t2.getText())==0)
{
pn9.pn2.t1.setText(""+s.username)
pn9.pn3.t1.setText(""+s.major)
pn9.pn3.t2.setText(""+s.institute)
pn9.pn6.ta.setText("您选修的课程有:"+s.course)
break
}
}
if(i==xiang.size())
{
d1=new Dialog(this,"警告",true)
Panel p1=new Panel()
p1.add(new Label("用户不存在!请重新输入!"))
d1.add("Center",p1)
Panel p2=new Panel()
p2.add(btn1)
d1.add("South",p2)
d1.setSize(200,100)
d1.show()
}
}
}
public void itemStateChanged(ItemEvent e)
{
List temp
String sList[]
String mgr=new String("")
if(e.getItemSelectable()instanceof List)
{
temp=(List)(e.getItemSelectable())
sList=temp.getSelectedItems()
for(int i=0i<sList.lengthi++)
mgr=mgr+sList[i]+" "
ss.append(mgr)
}
}
}
本程序已经成功！！！望再验证！！！！
