真假问题

[daryzhang]

学编程时间不长，还没看设计模式，对下面这个程序中的 ok 真假的转换实在弄不明白

我的理解是 当okButton点击时 ok 为真
当有对象调用showDialog时 ok 是先变假 最后return ok 的时候 不一直应该是假吗？
可我在后面的程序中有看到 showDialog好像有变真的时候 请高人指点。谢谢

class PasswordChooser extends JPanel {
private JTextField username;
private JPasswordField password;
private JButton okButton;
private JDialog dialog;
private boolean ok;

public PasswordChooser() {
setLayout(new BorderLayout());

JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 2));
panel.add(new JLabel("UserName: "));
panel.add(username = new JTextField(""));
panel.add(new JLabel("Password: "));
panel.add(password = new JPasswordField(""));
add(panel, BorderLayout.CENTER);

okButton = new JButton("OK");
okButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
ok = true;
dialog.setVisible(false);
}
});

JButton cancelButton = new JButton("Cancel");
cancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
dialog.setVisible(false);
}
});

JPanel buttonPanel = new JPanel();
buttonPanel.add(okButton);
buttonPanel.add(cancelButton);
add(buttonPanel, BorderLayout.SOUTH);
}
public void setUser(User u) {
username.setText(u.getName());
}
public User getUser() {
return new User(username.getText(), password.getPassword());
}
public boolean showDialog(Component parent, String title) {
ok = false;
Frame owner = null;

if(parent instanceof Frame)
owner = (Frame) parent;
else
owner = (Frame) SwingUtilities.getAncestorOfClass(Frame.class, parent);

if(dialog == null || dialog.getOwner() != owner) {
dialog = new JDialog(owner, true);
dialog.add(this);
dialog.setLocation(370, 300);
dialog.getRootPane().setDefaultButton(okButton);
dialog.pack();
}
dialog.setTitle(title);
dialog.setVisible(true);
return ok;
}
}

[JavaAlpha]

private boolean ok; 

初始 默认是 false

[bawgiitx]

抢位咯

[daryzhang]

上班没事的帮忙讲讲 啊

[Z_FEI]

可我在后面的程序中有看到 showDialog好像有变真的时候

看是先点击botton还是先调用showDialog！先后顺序不一样，自然结果也不一样

[bobo364]

okButton.addActionListener(new ActionListener() { 
            public void actionPerformed(ActionEvent event) { 
                ok = true; 
                dialog.setVisible(false); 
            } 

public boolean showDialog(Component parent, String title) { 
        ok = false; 
        Frame owner = null; 

根据这2段代码，显示了当ok button按下是ok为true,但下面段程序启动时ok为false

[wenjjing2lianee]

up

[daryzhang]

那大家的意思是 当启动showDialog的时候 ok一直是假？
但要是这样的话
private class ConnectListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if(pc == null)
pc = new PasswordChooser();
pc.setUser(new User("\"Guest\"", null));
if(pc.showDialog(ExchangeF.this, "Connect")) {
User u = pc.getUser();
jta.append("Username: " + u.getName() + ", Password: " +
new String(u.getPassword()) + "\n");
}
}
} 这个里面的红色那句不是应该没有为真的时候了？ 可是应该有啊

[叶涛网站推广优化]

现在真

[daryzhang]

那if里面的 真 是通过哪实现的呢？