面向对象

<p>面向对象的三大特征:</p> <ul> <li>封装： 对外部不可见。保护类中的操做不被直接访问 </li> <li>继承 </li> <li>多态：以前学习的方法重载 </li> </ul> <p>&#160;</p> <p>类和对象 是面向对象中两个最重要的概念。</p> <p><a href="http://static.oschina.net/uploads/img/201405/27210807_xp5z.png"><img style="background-image: none; border-right-width: 0px; padding-left: 0px; padding-right: 0px; display: inline; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px" title="image" border="0" alt="image" src="http://static.oschina.net/uploads/img/201405/27210808_avpj.png" width="244" height="99" /></a></p> <p><a href="http://static.oschina.net/uploads/img/201405/27210809_A2NY.png"><img style="background-image: none; border-right-width: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px" title="image" border="0" alt="image" src="http://static.oschina.net/uploads/img/201405/27210809_Ii8B.png" width="244" height="228" /></a></p> <p><a href="http://static.oschina.net/uploads/img/201405/27210810_4Tmk.png"><img style="background-image: none; border-right-width: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px" title="image" border="0" alt="image" src="http://static.oschina.net/uploads/img/201405/27210811_Shvp.png" width="244" height="139" /></a></p> <p><a href="http://static.oschina.net/uploads/img/201405/27210812_RT9o.png"><img style="background-image: none; border-right-width: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px" title="image" border="0" alt="image" src="http://static.oschina.net/uploads/img/201405/27210813_0Pcn.png" width="244" height="43" /></a></p>