IllegalType.md

Pattern: Class used as type in variable declaration, return value or parameter

Issue: -

Description

Checks that particular classes are never used as types in variable declarations, return values or parameters.

Rationale: Helps reduce coupling on concrete classes.

Examples

To configure the check so that it ignores getInstance() methods:

<module name="IllegalType">
    <property name="ignoredMethodNames" value="getInstance"/>
</module>

To configure the check so that it verifies only public, protected and static methods and fields:

<module name="IllegalType">
    <property name="memberModifiers" value="LITERAL_PUBLIC,
     LITERAL_PROTECTED, LITERAL_STATIC"/>
</module>

Further Reading

• checkstyle - IllegalType