17.5.1 Method parameters

• 
  　　The parameters of a method, if any, are declared by the method?s
  formal-parameter-list.
  formal-parameter-list:
  fixed-parameters
  fixed-parameters , parameter-array
  parameter-array
  fixed-parameters:
  fixed-parameter
  fixed-parameters , fixed-parameter
  fixed-parameter:
  attributesopt parameter-modifieropt type identifier
  parameter-modifier:
  ref
  out
  parameter-array:
  attributesopt params array-type identifier
  The formal parameter list consists of one or more comma-separated
  parameters of which only the last may be a
  parameter-array.
  A fixed-parameter consists of an optional set of attributes (§24), an
  optional ref or out modifier, a type, and an
  identifier. Each fixed-parameter declares a parameter of the given type
  with the given name.
  A parameter-array consists of an optional set of attributes (§24), a
  params modifier, an array-type, and an
  identifier. A parameter array declares a single parameter of the given
  array type with the given name. The arraytype
  of a parameter array must be a single-dimensional array type (§19.1). In a
  method invocation, a parameter
  array permits either a single argument of the given array type to be
  specified, or it permits zero or more
  arguments of the array element type to be specified. Parameter arrays are
  described further in §17.5.1.4.
  A method declaration creates a separate declaration space for parameters
  and local variables. Names are
  introduced into this declaration space by the formal parameter list of the
  method and by local variable
  declarations in the block of the method. All names in the declaration space
  of a method must be unique;
  otherwise, a compile-time error results.
  Chapter 17 Classes
  229
  A method invocation (§14.5.5.1) creates a copy, specific to that
  invocation, of the formal parameters and local
  variables of the method, and the argument list of the invocation assigns
  values or variable references to the newly
  created formal parameters. Within the block of a method, formal parameters
  can be referenced by their identifiers
  in simple-name expressions (§14.5.2).
  There are four kinds of formal parameters:
  ?
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