substring的用法

1234

substring(0,1)=1
substring(1,2)=2
substring(2,3)=3
substring(3,4)=4

Eclipse 中文化專案

http://babel.eclipse.org/babel/

Access restriction: The type NetworkInterface is not accessible due to restriction on required library

Windows -> Preferences -> Java -> Compiler -> Errors/Warnings -> Deprecated and trstricted API -> Forbidden reference (access rules): -> change to warning or Igone