import 실행 후 @override error 잡기 

1) Project -> Properties -> Java Compiler -> Compiler compliance level
2) select 1.6 

 or 

1) Project -> Properties -> Java Compiler -> Compiler compliance level
2) select 1.7



eclipse run & error: 

An internal error occurred during: "Launching New_configuration".Path for project must have only one segment 


Project -> Properties -> Run/Debug Settings: 


1. select "New_configuration" at Launch configurations 

2. Delete 

3. Apply 

4. OK and retry run

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