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解決:The declared package..does not match the expected package..

在MyEclipse中編寫Java程式碼時,用到了BASE64Decoder,import sun.misc.BASE64Decoder;可是Eclipse提示: 
Access restriction : The type BASE64Decoder is not accessible due to restriction on required library C:\Program 
files\java\jre6\lib\rt.jar 
Access restriction : The constructor BASE64Decoder() is not accessible due to restriction on required library C:\Program files\java\jre6\lib\rt.jar 


解決方案1(推薦):
只需要在project build path中先移除JRE System Library,再新增庫JRE System Library,重新編譯後就一切正常了。 
解決方案2:
Windows -> Preferences -> Java -> Compiler -> Errors/Warnings -> 
Deprecated and trstricted API -> Forbidden reference (access rules): -> change to warning