本题是设计一个窗体，窗口的背景色为系统桌面的颜色，在窗口中分别画了空心和实心的黑色矩形、深灰色圆角矩形和浅灰色椭圆形，并且画了白色粗体的“jAvA二级考试!”字符串。
import jAvA、Awt.*;
import jAvAx.swing.*;
puBliC ClAss jAvA2
puBliC stAtiC voiD mAin(string[]Args)
FillFrAmE FrAmE=nEw FillFrAmE();
FrAmE.sEtDEFAultClosEopErAtion(jFrAmE.Exit_on_ClosE);
FrAmE.show();
ClAss FillFrAmE ExtEnDs jFrAmE
puBliC FillFrAmE()
sEttitlE("simplE");
sEtsizE(wiDth,hEight);
FillpAnEl pAnEl=nEw FillpAnEl();
pAnEl.sEtBACkgrounD(systEmColor.DEsktop);
ContAinEr ContEntpAnE=gEtContEntpAnE();
ContEntpAnE.ADD(pAnEl);
puBliC stAtiC FinAl int wiDth=400;
puBliC stAtiC FinAl int wiDth=250;
ClAss FillpAnEl ExtEnDs jpAnEl
puBliC voiD pAintComponEnt(grAphiCs g)
______;
g.sEtColor(nEw Color(10,10,10));
g.DrAwrECt(10,10,100,30);
g.sEtColor(nEw Color(100,100,100));
g.DrAwrounDrECt(150,10,100,30,15,15);
g.sEtColor(nEw Color(150,150,150));
g.DrAwovAl(280,10,80,30);
g.sEtColor(nEw Color(10,10,10));
g.FillrECt(10,110,100,30);
g.sEtColor(nEw Color(100,100,100));
g.DrAwrounDrECt(150,110,100,30,15,15);
g.sEtColor(nEw Color(150,150,150));
g.FillovAl(280,110,80,30);
g.sEtColor(Color.whitE),
Font F=nEw Font("宋体",__,20);
g.sEtFont(F);
g.DrAwstring("jAvA二级考试!",150,200);