Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!border3.nntp.dca.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!postnews.google.com!s16g2000prf.googlegroups.com!not-for-mail From: Lewis Bloch Newsgroups: comp.lang.java.programmer,comp.lang.java.help Subject: Re: What's the difference between and instance and an object? Date: Fri, 10 Jun 2011 11:06:51 -0700 (PDT) Organization: http://groups.google.com Lines: 15 Message-ID: References: <5d84ac2b-e81b-4c40-b3e3-c7248f1d7298@r35g2000prj.googlegroups.com> <4decfdbc$0$17721$426a74cc@news.free.fr> <1a327de4-8451-4379-a75b-7cc2dab3fb5b@34g2000pru.googlegroups.com> <4ded05bb$0$17813$426a74cc@news.free.fr> NNTP-Posting-Host: 127.6.6.6 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1307729319 30766 127.0.0.1 (10 Jun 2011 18:08:39 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Fri, 10 Jun 2011 18:08:39 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: s16g2000prf.googlegroups.com; posting-host=127.6.6.6; posting-account=6gJCewoAAAATGk_BiH9Eo-1pkyAWegc7 User-Agent: G2/1.0 X-Google-Web-Client: true X-Google-Header-Order: ASELCHRU X-HTTP-UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.91 Safari/534.30,gzip(gfe) Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:5191 comp.lang.java.help:762 On Jun 8, 8:51=A0am, Abu Yahya wrote: > On 6/6/2011 10:24 PM, Mayeul wrote: > > > In other words, it cannot possibly build an instance of any other class= , > > neither Object nor anything. > > Won't 'A' be an instanceOf Object? An object of any type T is automatically and inherently an instance of any type S that is a supertype of T, by the very definition of subtyping. Subtypes embody the /is-a/ relationship. -- Lew