[填空题] 请将下列程序的空白处补充完整。
Importjava.awt.*;
PublicclassEll_4
Publicstaticvoidmain(Stringargs[])
Framef=newFrame(“BorderLayout”);
fiadd(“North”,newbuRon(“North”));
f.add(“East”,newbutton(“East”));
f.add(“West”,newbutton(“West”));
f.add(“South”,tf);
f.setSize(200,200)
fipack();
fisetVisible(true);