[YARN-8976] Remove redundant modifiers in interface "ApplicationConstants"

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 3.3.0
• Hadoop Flags: Reviewed
• Assignee: Zhankun Tang
• Reporter: Zhankun Tang
• Created: 06/Nov/18 08:32
• Updated: 07/Nov/18 03:03
• Resolved: 07/Nov/18 02:51

Description

There're many redundant modifiers in ApplicationContants.java. For instance, "public static final" is redundant due to the String in an interface is implicitly public static final.

public static final String CLASS_PATH_SEPARATOR = "<CPS>"

And the redundant public modifier for enums defination in interface and redundant private modifier for enum constructor.