1. 能在JFrame、JApplet、Canvas等对象上绘制圆、椭圆、矩形、线段等图形。

2. 能编写画圆、画矩形等应用程序。

-1. Can JFrame, JApplet, Canvas and other objects to draw circles, ellipses, rectangles, line segments and other graphics. 2. Can write draw a circle, draw rectangle, etc. applications.