填空题

下面是生成一个依赖窗口的对话框，属性为modal，请把所缺的代码补齐。
import java.awt.*;
public class DialogDemo extends Frame
DialogDemo()

SetTitle("Demo");
Panel p=new Panel();
p.add(new label("one"));
p.add(new Checkbox ("two"));
add("North",p);
add("Center",new TextArea("three",3,10));
Dialog d=new Dialog(this," a cat", 【12】 );
d.add("North",new Label ("Modal dialog");
d.add("Center",new TextArea("hello");
d.pack ();
d.show ();

public static void main(String args[])

DialogDemo f=new DialogDemo();
f.pack();
f.show();

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