com.sun.awt.AWTUtilities这个类出现错误

http://stackoverflow.com/questions/860187/access-restriction-on-class-due-to-restriction-on-required-library-rt-jar

解决方案如下：

When using com.sun.awt.AWTUtilities, Eclipse gives a error:

- Access restriction: The method setWindowOpacity(Window, float) from the type AWTUtilities is not accessible due to restriction on requiredlibrary C:\Program Files\Java\jre6\lib\rt.jar

- Access restriction: The type AWTUtilities is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\rt.jar

You can fix it like this:

Preferences -> Java -> Compiler -> Errors/Warnings -> Deprecated and restricted API ->

Forbidden reference -> change "error" to "warning"

Don't worry. It works.