Re: Strings...immutable?

From: (Stefan Ram)
21 Mar 2007 13:24:44 GMT
Patricia Shanahan <> writes:

C pointers can point to pointers, without them being wrapped in a struct
or array. Java references cannot point to other unwrapped Java
references, so Java pointers are not C pointers.

  In C, a pointer can point /only/ to objects, just as in Java.

  In C, any storage location with a type is called an ?object? -
  this is called ?variable? in Java.

  For example, in C, in the compound-statement

{ int * a = 0; int * * b = &a; }

  the name ?a? is the name of an object.

  By this language-specific interpretation of both terms,
  the statement literally holds again in both languages.

  In both languages, an object is what can be referred to by
  a pointer.


  The notion ?pointer? actually is an abbreviation, but this
  usage sometimes leads to confusion.

  ?pointer? might mean

    - ?pointer value? (like ?0? in C or ?null? in Java) or
    - a storage location containing a pointer value
      (a ?reference variable? in Java, or a ?pointer object? in C)

  In the above compound-statement, b points to a pointer
  /storage location/ (called an ?object? in C, or ?variable? in
  Java), which then in turn contains a pointer /value/ (here, 0).

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