关于 Modal 窗体
在 Swing 中只有 JDialog 可以设置为 Modal 窗体，其方法可以在构造函数（例如“JDialog(Frame owner, boolean modal)”）中传参数，也可以用 setModal(boolean b) 方法设定，
这个方法是从 Dialog 类继续的。
在 JFrame 类中，无法通过如 JDialog 的方法设置 Modal 窗体，在 CSDN 有朋友尝试通过在 windowDeiconified() 时 requestFocus() 来模拟 Modal 窗体，代码如下：
public class MyModalFrame extends JFrame implements WindowListener ...{
PRivate JFrame frame = null;
private boolean modal = false;
private String title = null;
public MyModalFrame() ...{
this(null, false);
}
public MyModalFrame(JFrame frame) ...{
this(frame, false);
}
public MyModalFrame(JFrame frame, boolean modal) ...{
this(frame, modal, "");
}
public MyModalFrame(JFrame frame, boolean modal, String title) ...{
super(title);
this.frame = frame;
this.modal = modal;
this.title = title;
this.init();
}
private void init() ...{
if(modal)
frame.setEnabled(false);
this.addWindowListener(this);
}
public void windowOpened(WindowEvent windowEvent) ...{
}
public void windowClosing(WindowEvent windowEvent) ...{
if(modal)
frame.setEnabled(true);
}
public void windowClosed(WindowEvent windowEvent) ...{
}
public void windowIconified(WindowEvent windowEvent) ...{
}
public void windowDeiconified(WindowEvent windowEvent) ...{
}
public void windowActivated(WindowEvent windowEvent) ...{
}
public void windowDeactivated(WindowEvent windowEvent) ...{
if(modal)
this.requestFocus();
}
}
关于窗体启动位置
有时候想要让窗体启动后在屏幕中间启动，有种比较复杂的方法：
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension size = frame.getSize();
int x = (screenSize.width - size.width) / 2;
int y = (screenSize.height - size.height) / 2;
frame.setLocation( x, y );
在 java 1.4 版之后可以用一条语句代替：
frame.setLocationRelativeTo(null);
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