question: private final StringBuilder appendParameterSignature ( StringBuilder buffer , char [ ] [ ] parameterTypes , char [ ] [ ] parameterNames ) { if ( parameterTypes != null ) { for ( int i = 0 ; i < parameterTypes . length ; i ++ ) { if ( i > 0 ) { buffer . append ( ',' ) ; buffer . append ( ' ' ) ; } buffer . append ( parameterTypes [ i ] ) ; if ( parameterNames != null && parameterNames [ i ] != null ) { buffer . append ( ' ' ) ; buffer . append ( parameterNames [ i ] ) ; } } } return buffer ; }
target:  Creates a display string of a parameter list (without the parentheses) for the given parameter types and names.