<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On 01/mar/07, at 16:52, Gianluca Baù wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><P><FONT face="Verdana, Arial, Helvetica" size="-1"><SPAN class="Apple-style-span" style="font-family: Verdana; font-size: 10px; ">An abstract class is a class that is only partially implemented by the programmer. It may contain one or more abstract methods. An abstract method is simply a function definition that serves to tell the programmer that the method must be implemented in a child class.</SPAN></FONT></P><P><FONT face="Verdana, Arial, Helvetica" size="-1"><SPAN class="Apple-style-span" style="font-family: Verdana; font-size: 10px; ">To create an abstract class we use the code shown in Listing 1:</SPAN></FONT></P></SPAN></BLOCKQUOTE><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>Si, è il meccanismo della derivazione di una classe base. Se la classe padre è astratta significa solo che non può essere istanziata e deve epr forza essere derivata.<BR></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>Cris</DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV style="">-- </DIV><DIV style="">Cristiano Verondini</DIV><DIV style=""><A href="http://www.verondini.it">http://www.verondini.it</A> --- [ICQ 114 190]</DIV><DIV style=""><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></BODY></HTML>