Files to move:

InputCatchParameterName.java
InputXpathMissingNullCaseInSwitchNested.java
InputPatternVariableNameUnnamed.java
InputLambdaParameterName.java
InputXpathWhenShouldBeUsedNested.java
InputUnnamedVariables.java
InputXpathMissingNullCaseInSwitchSimple.java
InputRightCurlySwitchWhen.java
InputFinalParametersUnnamedPropertyFalse.java
InputUnusedLambdaParameterShouldBeUnnamedSingleLambdaParameter.java
InputMethodParamPadCheckRecordPattern.java
InputUnnecessaryParenthesesCheckPatterns.java
InputAnnotationOnSameLinePatternVariables.java
InputRedundantModifierFinalUnnamedVariablesWithOldVersion.java
InputSimplifyBooleanExpressionWithWhen.java
InputMissingNullCaseInSwitchWithPattern.java
InputFallThroughWithPatternMatchingCheckLastCase.java
InputWhitespaceAfterUnnamedPattern.java
InputAnnotationLocationLocalAndPatternVariables.java
InputMagicNumberMagicNumberWithUnnamedVariables.java
InputRedundantModifierFinalUnnamedVariables.java
InputMagicNumberMagicNumberInGuards.java
InputUnusedCatchParameterShouldBeUnnamed.java
InputNoWhitespaceBeforeCaseDefaultColonPatternMatchingForSwitch.java
InputUnusedCatchParameterShouldBeUnnamedNested.java
InputPatternVariableNameRecordPattern.java
InputFinalLocalVariableValidateUnnamedVariablesTrue.java
InputIllegalIdentifierNameRecordPattern.java
InputWhitespaceAroundUnnamedPattern.java
InputUnusedLambdaParameterShouldBeUnnamedNested.java
InputFinalLocalVariableValidateUnnamedVariablesFalse.java
InputMethodParamPadCheckRecordPattern2.java
InputParenPadForRecordPatternWithSpaceOption.java
InputOperatorWrapInstanceOfOperator.java
InputUnnamedVariableSwitch.java
InputFallThroughWithPatternMatching.java
InputUnusedLocalVariableWithAllowUnnamed.java
InputFinalParametersUnnamedPropertyTrue.java
InputNoWhitespaceAfterUnnamedPattern.java
InputIllegalTypeWithRecordPattern.java
InputMissingNullCaseInSwitchWithRecordPattern.java
InputBooleanExpressionComplexityWhenExpression.java
InputHiddenFieldRecordPattern.java
InputUnusedLocalVariableWithAllowUnnamedFalse.java
InputMissingSwitchDefaultRecordPattern.java
InputUnusedCatchParameterShouldBeUnnamedWithResourceAndFinally.java
InputWhenShouldBeUsedSwitchExpression.java
InputWhenShouldBeUsedSwitchStatements.java
InputIndentationRecordPattern.java
InputUnnamedVariableBasic.java
InputPatternVariableNameUnnamed.java
InputEmptyBlockCaseAndDefaultWithTextOption.java
InputOperatorWrapInstanceOfOperatorEndOfLine.java
InputCatchParameterNameUnnamed.java
InputUnusedLambdaParameterShouldBeUnnamedMultipleParameters.java
InputWhenShouldBeUsedSwitchRule.java
InputLocalVariableNameUnnamedVariables.java
InputLocalFinalVariableNameUnnamedVariables.java
InputEqualsAvoidNullRecordPattern.java
InputNPathComplexityPatternMatchingForSwitch.java
InputSuppressWarningsPatternVariables.java
InputAbbreviationAsWordInNameCheckRecordPatterns.java
InputMultipleVariableDeclarationsUnnamedVariables.java
InputVariableDeclarationUsageDistancePatternVariables.java
InputLambdaParameterNameUnnamed.java
InputIllegalIdentifierNameUnnamedVariables.java
InputParenPadForRecordPattern.java
Example2.java
Example1.java
Example1.java
Example1.java
Example4.java
Example2.java
Example1.java
Example3.java
Example5.java
Example1.java
Example4.java

example of error in Idea:

checkstyle/src/it/resources/com/google/checkstyle/test/
chapter5naming/rule526parameternames/InputCatchParameterName.java:100:24
java: unnamed variables are a preview feature and are disabled by default.
  (use --enable-preview to enable unnamed variables)