[9.1.类的构造函数](9.1.%E7%B1%BB%E7%9A%84%E6%9E%84%E9%80%A0%E5%87%BD%E6%95%B0.md) [9.2.默认构造函数](9.2.%E9%BB%98%E8%AE%A4%E6%9E%84%E9%80%A0%E5%87%BD%E6%95%B0.md) [9.3.构造方法重载](9.3.%E6%9E%84%E9%80%A0%E6%96%B9%E6%B3%95%E9%87%8D%E8%BD%BD.md) [9.4.this 与 this()的区别](9.4.this%E4%B8%8Ethis%E7%9A%84%E5%8C%BA%E5%88%AB.md) [9.5.初始化的顺序](9.5.%E5%88%9D%E5%A7%8B%E5%8C%96%E7%9A%84%E9%A1%BA%E5%BA%8F.md) [9.6.数据封装](9.6.%E6%95%B0%E6%8D%AE%E5%B0%81%E8%A3%85.md) [9.7.不可变类](9.7.%E4%B8%8D%E5%8F%AF%E5%8F%98%E7%B1%BB.md) [9.8.类与继承第一部分](9.8.%E7%B1%BB%E4%B8%8E%E9%9B%86%E6%88%90%E7%AC%AC%E4%B8%80%E9%83%A8%E5%88%86.md) [9.9.类与继承第二部分](9.9.%E7%B1%BB%E4%B8%8E%E7%BB%A7%E6%89%BF%E7%AC%AC%E4%BA%8C%E9%83%A8%E5%88%86.md) [9.10方法重写](9.10%E6%96%B9%E6%B3%95%E9%87%8D%E5%86%99.md) [9.11.super 与 super()的区别](9.11.super%E4%B8%8Esuper%E7%9A%84%E5%8C%BA%E5%88%AB.md) [9.12.重载与重写的区别](9.12.%E9%87%8D%E8%BD%BD%E4%B8%8E%E9%87%8D%E5%86%99%E7%9A%84%E5%8C%BA%E5%88%AB.md) [9.13.抽象类](9.13.%E6%8A%BD%E8%B1%A1%E7%B1%BB.md) [9.14.抽象方法](9.14.%E6%8A%BD%E8%B1%A1%E6%96%B9%E6%B3%95.md) [9.15.创建接口](9.15.%E5%88%9B%E5%BB%BA%E6%8E%A5%E5%8F%A3.md) [9.16.实现接口](9.16.%E5%AE%9E%E7%8E%B0%E6%8E%A5%E5%8F%A3.md) [9.17.接口的默认方法](9.17.%E6%8E%A5%E5%8F%A3%E7%9A%84%E9%BB%98%E8%AE%A4%E6%96%B9%E6%B3%95.md) [9.18.接口的静态方法](9.18.%E6%8E%A5%E5%8F%A3%E7%9A%84%E9%9D%99%E6%80%81%E6%96%B9%E6%B3%95.md) [9.19.抽象类与接口的区别](9.19.%E6%8A%BD%E8%B1%A1%E7%B1%BB%E4%B8%8E%E6%8E%A5%E5%8F%A3%E7%9A%84%E5%8C%BA%E5%88%AB.md) [9.20.多态](9.20.%E5%A4%9A%E6%80%81.md) [9.21.虚方法](9.21.%E8%99%9A%E6%96%B9%E6%B3%95.md) [9.22.参数多态](9.22.%E5%8F%82%E6%95%B0%E5%A4%9A%E6%80%81.md) [9.23.考试题目举例](9.23.%E8%80%83%E8%AF%95%E9%A2%98%E7%9B%AE%E4%B8%BE%E4%BE%8B.md)