大家看看是怎么回事？
程序：//
import java.awt.*;
import java.awt.event.*;
//import java.swing.*;
import *;
import *;
public class LoginDemol6 extends Frame implements ActionListener , ItemListener
{
Label ly = new Label("请输入你的个人信息，账号和密码，单击确定");
Label lLogin = new Label("账号:");
Label lKey = new Label("密码:");
Label lName = new Label("姓名:");
Label lSex = new Label("性别:");
Label lBd = new Label("生日:");
Label lHobby = new Label("爱好:");
TextField tLogin = new TextField("",6);
TextField tKey = new TextField("",6);
TextField tName = new TextField("",6);
CheckboxGroup nannv = new CheckboxGroup();
Checkbox nan = new Checkbox("男",nannv,true);
Checkbox nv = new Checkbox("女",nannv,false);
Choice cn = new Choice();
Choice cy = new Choice();
Choice cr = new Choice();
Checkbox c1 = new Checkbox("电影",false);
Checkbox c2 = new Checkbox("阅读",false);
Checkbox c3 = new Checkbox("网络",false);
Checkbox c4 = new Checkbox("编程",false);
Checkbox c5 = new Checkbox("艺术",false);
Checkbox c6 = new Checkbox("旅游",false);
Checkbox c7 = new Checkbox("游戏",false);
Checkbox c8 = new Checkbox("其他",false);
TextArea ta = new TextArea("",3,30);
Button qd = new Button("确定");
Button tc = new Button("退出");
String Sex = "",Year = "",Month = "",Day= "";
String Film = "",Reading = "",Network = "",Program = "",Art = "",Tourism = "",Game = "",Others = "";
String strKey = "";
Boolean flag = true;
public LoginDemol6()
{
setTitle("用户个人信息");
setLayout(new FlowLayout());
add(ly);
add(lLogin);
add(tLogin);
add(lKey);
tKey.setEchoChar('*');
add(tKey);
add(lName);
add(tName);
add(lSex);
nan.addItemListener(this);
nv.addItemListener(this);
add(nan);
add(nv);
add(lBd);
String a[]=new String[5];
int i, s = 0;
for (i=1990;s<a.length;i++ )
{
a[s] = new String();
a[s].append(i+"年");
cn.add(a[s]);
}
cy.add("11月");
cy.add("12月");
cr.add("11日");
cr.add("12日");
cn.addItemListener(this);
cy.addItemListener(this);
cr.addItemListener(this);
add(cn);
add(cy);
add(cr);
add(lHobby);
c1.addItemListener(this);
c2.addItemListener(this);
c3.addItemListener(this);
c4.addItemListener(this);
c5.addItemListener(this);
c6.addItemListener(this);
c7.addItemListener(this);
c8.addItemListener(this);
add(c1);
add(c2);
add(c3);
add(c4);
add(new Label(" "));
add(new Label(" "));
add(c5);
add(c6);
add(c7);
add(c8);
qd.addActionListener(this);
tc.addActionListener(this);
add(ta);
add(qd);
add(tc);
setSize(260,320);
setVisible(true);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent ae)
{
ta.setText("");
if (ae.getSource() == qd)
{
if (flag == true)
{
flag = false;
ta.append("姓名:"+tName.getText()+"\n");
ta.append("性别:"+Sex+"\n");
ta.append("生日:"+Year+Month+Day+"\n");
ta.append("爱好:"+Film+Reading+Network+Program+Art+Tourism+Game+Others+"\n");
strKey = tKey.getText();
tKey.setText("");
ly.setText("请再次输入密码，然后单击确定");
}
else
{
if (tKey.getText().equals(strKey))
{
ly.setText("注册成功！");
}
else
{
ly.setText("密码与上次不符，请再次输入密码！");
}
}
}
else
{
System.exit(0);
}
}
public void itemStateChanged(ItemEvent e)
{
if (nan.getState())
{
Sex = nan.getLabel();
}
if (nv.getState())
{
Sex = nv.getLabel();
}
if (e.getItemSelectable() == cn)
{
Year = cn.getSelectedItem();
}
if (e.getItemSelectable() == cy)
{
Month = cy.getSelectedItem();
}
if (e.getItemSelectable() == cr)
{
Day = cr.getSelectedItem();
}
if (c1.getState())
{
Film = c1.getLabel();
}
if (c2.getState())
{
Reading = c2.getLabel();
}
if (c3.getState())
{
Network = c3.getLabel();
}
if (c4.getState())
{
Program = c4.getLabel();
}
if (c5.getState())
{
Art = c5.getLabel();
}
if (c6.getState())
{
Tourism = c6.getLabel();
}
if (c7.getState())
{
Game = c7.getLabel();
}
if (c8.getState())
{
Others = c8.getLabel();
}
}
public static void main(String args[])
{
new LoginDemol6();
}
}
编译时出现如下错误：
E:\java>javac LoginDemol6.java
LoginDemol6.java:68: 找不到符号
符号： 方法 append(java.lang.String)
位置： 类 java.lang.String
a[s].append(i+"年");
^
1 错误
