Fixe permission issues reported by CheckStyle
Fixe flow issues reported by CheckStyle
Fixe issues on boolean methods reported by CheckStyle
Fixe issues on redundant variables reported by CheckStyle
Fixe issues on unused imports reported by CheckStyle
Replace for statements into for-each style
Fix migration issues reported by CheckStyle
Fix issues on unused imports reported by CheckStyle
Fix issues on redundant casts and conditions
Remove redundant initialization
Remove inefficient string concatenation
Remove redundant throws clouse
Fix build error
Add final for safe
Surpress part of weaker access issues
Fix typos
Fix typos
Fix build error
Merge pull request #67 from takahi-i/fix-checkstyle-errors

All test passed.