一个如何创建界面的问题

[charlesxu]

我下载了一段代码，拷贝到eclipse后有错误，不能使用，请问该怎样生成界面.

public class MailClient extends Frame {
/* The stuff for the GUI. */
private Button btSend = new Button("Send");
private Button btClear = new Button("Clear");
private Button btQuit = new Button("Quit");
private Label serverLabel = new Label("Local mailserver:");
private TextField serverField = new TextField("", 40);
private Label fromLabel = new Label("From:");
private TextField fromField = new TextField("", 40);
private Label toLabel = new Label("To:");
private TextField toField = new TextField("", 40);
private Label subjectLabel = new Label("Subject:");
private TextField subjectField = new TextField("", 40);
private Label messageLabel = new Label("Message:");
private TextArea messageText = new TextArea(10, 40);

/**
* Create a new MailClient window with fields for entering all
* the relevant information (From, To, Subject, and message).
*/
public MailClient() {
super("Java Mailclient");

/* Create panels for holding the fields. To make it look nice,
create an extra panel for holding all the child panels. */
Panel serverPanel = new Panel(new BorderLayout());
Panel fromPanel = new Panel(new BorderLayout());
Panel toPanel = new Panel(new BorderLayout());
Panel subjectPanel = new Panel(new BorderLayout());
Panel messagePanel = new Panel(new BorderLayout());
serverPanel.add(serverLabel, BorderLayout.WEST);
serverPanel.add(serverField, BorderLayout.CENTER);
fromPanel.add(fromLabel, BorderLayout.WEST);
fromPanel.add(fromField, BorderLayout.CENTER);
toPanel.add(toLabel, BorderLayout.WEST);
toPanel.add(toField, BorderLayout.CENTER);
subjectPanel.add(subjectLabel, BorderLayout.WEST);
subjectPanel.add(subjectField, BorderLayout.CENTER);
messagePanel.add(messageLabel, BorderLayout.NORTH);
messagePanel.add(messageText, BorderLayout.CENTER);
Panel fieldPanel = new Panel(new GridLayout(0, 1));
fieldPanel.add(serverPanel);
fieldPanel.add(fromPanel);
fieldPanel.add(toPanel);
fieldPanel.add(subjectPanel);

/* Create a panel for the buttons and add listeners to the
buttons. */
Panel buttonPanel = new Panel(new GridLayout(1, 0));
btSend.addActionListener(new SendListener());
btClear.addActionListener(new ClearListener());
btQuit.addActionListener(new QuitListener());
buttonPanel.add(btSend);
buttonPanel.add(btClear);
buttonPanel.add(btQuit);

/* Add, pack, and show. */
add(fieldPanel, BorderLayout.NORTH);
add(messagePanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.SOUTH);
pack();
show();
}

static public void main(String argv[]) {
new MailClient();
}

[whitewolfjx]

你的那几个Listener定义了吗?

[charlesxu]

这个问题已经解决了(因为开始没定义package，汗一个).

[beibeiG]

语法没通过 Ecilpse等IDE都会有提示
这种基础的语法问题不必要拿出来提问