導入Java . awt . *；\ x0d \ import Java . awt . event . *；\ x0d \ import javax . swing . *；\x0d\public類Els擴展JFrame實現KeyListener，Runnable \ x0d \ { \ x0d \ public Els()\ x0d \ { \ x0d \ setSize(240，320)；\ x0d \ setun decorated(true)；\ x0d \ int H =(int)(this . gettoolkit()。getScreenSize()。身高)；\ x0d \ int W =(int)(this . gettoolkit()。getScreenSize()。寬度)；\x0d\setLocation(W/2-120，H/2-160)；\ x0d \ setResizable(false)；\ x0d \ setDefaultCloseOperation(JFrame。EXIT _ ON _ CLOSE)；\ x0d \ } \ x0d \ public void paint(Graphics g)\ x0d \ { \ x0d \ super . paint(g)；\ x0d \ graphics 2d G2 =(graphics 2d)g；\ x0d \ G2 . set color(color . dark gray . brighter()。更亮())；\x0d\ \x0d\ //畫壹個小方框\ x0d \ for(int m = 192；m
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