Checks that the order of modifiers conforms to the suggestions in the Java Language specification, sections 8.1.1, 8.3.1 and 8.4.3. The correct order is:

1. public
2. protected
3. private
4. abstract
5. static
6. final
7. transient
8. volatile
9. synchronized
10. native
11. strictfp

To configure the check:

com.puppycrawl.tools.checkstyle.checks.modifier

TreeWalker

Checks for redundant modifiers in:

1. interface and annotation definitions,
2. the final modifier on methods of final classes, and
3. inner interface declarations that are declared as static.

Rationale: The Java Language Specification strongly discourages the usage of public and abstract for method declarations in interface definitions as a matter of style.

Interfaces by definition are abstract so the abstract modifier on the interface is redundant.

Variables in interfaces and annotations are automatically public, static and final, so these modifiers are redundant as well.

As annotations are a form of interface, their fields are also automatically public, static and final just as their annotation fields are automatically public and abstract.

Final classes by definition cannot be extended so the final modifier on the method of a final class is redundant.

To configure the check:

To configure the check to check only methods and not variables:

com.puppycrawl.tools.checkstyle.checks.modifier

TreeWalker