[FLINK-17277] Apply IntelliJ recommendations to training exercises

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.10.1, 1.11.0
• Component/s: Documentation / Training / Exercises
• Labels: pull-request-available
• Assignee: Nico Kruber
• Reporter: Nico Kruber
• Created: 20/Apr/20 15:03
• Updated: 21/Apr/20 10:40
• Resolved: 21/Apr/20 10:40

Description

IntelliJ has a few recommendations on the original code of the training exercises. These should be addressed to serve as good reference code.