package com.google.checkstyle.test.chapter5naming.rule526parameternames;
   
   import java.util.function.BiFunction;
   import java.util.function.Function;
   
   /** some javadoc. */
   public class InputLambdaParameterName {
   
     Function<String, String> badNamedParameterWithoutParenthesis =
        S -> S.trim().toLowerCase(); // violation 'Lambda parameter name 'S' must match pattern'
  
    Function<String, String> badNamedParameterWithParenthesis = (sT) -> sT.trim().toLowerCase();
    // violation above 'Lambda parameter name 'sT' must match pattern'
  
    BiFunction<String, String, String> twoBadNamedParameters = (sT1, sT2) -> sT1 + sT2;
    // 2 violations above:
    //                    'Lambda parameter name 'sT1' must match pattern'
    //                    'Lambda parameter name 'sT2' must match pattern'
  
    BiFunction<String, String, String> badNamedParameterInBiFunction =
        (first, _s) -> first + _s; // violation 'Lambda parameter name '_s' must match pattern'
  
    Function<String, Integer> goodNamedParameterWithoutParenthesis =
        notTrimmedString -> notTrimmedString.trim().length();
  
    Function<String, Integer> goodNamedParameterWithParenthesis =
        (notTrimmedString) -> notTrimmedString.trim().length();
  
    BiFunction<String, String, Integer> goodNamedParameters =
        (first, second) -> (first + second).length();
  }