问题
I assumed "Eclipse SDK" was installed by default with Eclipse, I am using eclipse JEE. But when I go try to intall via the update site, I have to option to install it, meaning it is not installed already. Can someone please help me to figure this out ?
回答1:
Eclipse SDK is the plug-ins for the core of Eclipse and includes the source code plug-ins. You probably already have the normal plug-ins but not the source code.
With the source code plug-ins installed it is easy to read the Eclipse source. Open the Preferences and go to 'Plug-in Development' Checking the 'Include all plug-ins from target in Java search' will make the source code available in dialogs such as 'Navigate > Open Type'.
来源：https://stackoverflow.com/questions/37948509/what-is-eclipse-sdk