出错提示为:(这是其中的一部分,) kucun_guanli.java:31: cannot resolve symbol symbol : method Add (java.awt.Label) location: class user Add(lbl_username); ^ kucun_guanli.java:33: cannot resolve symbol symbol : method add (java.awt.Label) location: class user add(lbl_passworld); ^ kucun_guanli.java:35: cannot resolve symbol symbol : method add (java.awt.TextField) location: class user add(txt_username); ^ kucun_guanli.java:37: cannot resolve symbol symbol : method add (java.awt.TextField) location: class user add(txt_passworld); ^ kucun_guanli.java:39: cannot resolve symbol symbol : method add (java.awt.Button) location: class user add(btn_login); ^ kucun_guanli.java:41: cannot resolve symbol symbol : method add (java.awt.Button) location: class user add(btn_cancel); ^ kucun_guanli.java:44: cannot resolve symbol symbol : method addActionlistener (user) location: class java.awt.Button btn_login.addActionlistener(this); ^ kucun_guanli.java:46: cannot resolve symbol symbol : method addActinlistener (user) location: class java.awt.Button btn_cancel.addActinlistener(this);
我是初学者,,这是我第一次动手写程序,,所以写的很糟,,不要笑我啊!!class user { public static void main (String [] arg) { MainWindow userwindows=new MainWindows("用户登陆");
kucun_guanli.java:31: cannot resolve symbol
symbol : method Add (java.awt.Label)
location: class user
Add(lbl_username);
^
kucun_guanli.java:33: cannot resolve symbol
symbol : method add (java.awt.Label)
location: class user
add(lbl_passworld);
^
kucun_guanli.java:35: cannot resolve symbol
symbol : method add (java.awt.TextField)
location: class user
add(txt_username);
^
kucun_guanli.java:37: cannot resolve symbol
symbol : method add (java.awt.TextField)
location: class user
add(txt_passworld);
^
kucun_guanli.java:39: cannot resolve symbol
symbol : method add (java.awt.Button)
location: class user
add(btn_login);
^
kucun_guanli.java:41: cannot resolve symbol
symbol : method add (java.awt.Button)
location: class user
add(btn_cancel);
^
kucun_guanli.java:44: cannot resolve symbol
symbol : method addActionlistener (user)
location: class java.awt.Button
btn_login.addActionlistener(this);
^
kucun_guanli.java:46: cannot resolve symbol
symbol : method addActinlistener (user)
location: class java.awt.Button
btn_cancel.addActinlistener(this);
{
public static void main (String [] arg)
{
MainWindow userwindows=new MainWindows("用户登陆");
userwindows.SetVisible(true); Label lbl_username=new Label("用户名");
Label lbl_passworld=new Label("密码");
TextField txt_username=new TextField(); TextField txt_passworld=new TextField(); Button btn_login=new Button("确定");
Button btn_cancel=new Button("取消");
}
public void user()
{ txt_passworld.setEchoChar("*"); Add(lbl_username); add(lbl_passworld); add(txt_username); add(txt_passworld); add(btn_login); add(btn_cancel); btn_login.addActionlistener(this);
btn_cancel.addActinlistener(this);
}
}
btn_login和btn_cancel在user方法里是不可见的。
好的,,谢谢啦
import java.awt.event.*;class user extends Frame
implements ActionListener{
Button btn_login,btn_cancel;
public static void main (String [] arg) {
user userwindows=new user("用户登陆");
userwindows.setVisible(true); }
public user(String s) {
super(s);
setLayout(new FlowLayout());
Label lbl_username=new Label("用户名");
Label lbl_passworld=new Label("密码");
TextField txt_username=new TextField();
TextField txt_passworld=new TextField();
btn_login=new Button("确定");
btn_cancel=new Button("取消");
txt_passworld.setEchoChar('*'); add(lbl_username); add(lbl_passworld); add(txt_username); add(txt_passworld); add(btn_login); add(btn_cancel); btn_login.addActionListener(this);
btn_cancel.addActionListener(this);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
setSize(320,240);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==this.btn_login){
System.out.println ("you clicked login");
}
if(e.getSource()==this.btn_cancel){
System.out.println ("you clicked cancel");
}
}
}
到现在为止,,书没看完,,所以
kypfos(就当我没上过大学),,你改过以后的有好多地方我不是看的很明白呢,,,呵呵呵!!!!抱歉抱歉
程序如下:
class helloworld
{
public static void main(String[] args)
{
System.out.println("Hello World!");
}
}
java_home?????
何意,,
可以解释一下吗???
有jre也会在jre的目录里找相应的class
如果这样,,那classpath是不是就可以不用配置了呢???
jre是java runtime envionment -- java运行环境
我竟然连这些最基本的概念都没有能明白呢,,
不过问了这个愚蠢的问题以后,,我发现java我应该再从头学起了,,
毛主席教导我们,要
good good study,day day up
因为你学的是自己的第一种语言,难免有这么多的难处和问题。你看这么多人帮你,你还怕什么了。不要说“蠢”!很多人学Java,都是有C语言和C++的编程基础,他们学Java是很快的。 而你这一类学习者不同,没基础当然学得慢了。
关于程序的错误,是因为有一个javabook的类库未导入,
而我用了里面的一个类MainWindow,,
因为这个错误,,导致后面的全部错误,,