2.1关键字:class,public, int 合法的:applet, Applet, , apps, x, y, radius 不合法的:a++, --a, 4#R, #442, class,public, int。2.1关键字:class,public, int 合法的:applet, Apple
2.1关键字:class,public, int 合法的:applet, Applet, , apps, x, y, radius 不合法的:a++, --a, 4#R, #442, class,public, int。2.1关键字:class,public, int 合法的:applet, Apple