面向对象编程(章节摘要)
1,面向对象有3个主要特征,即封装性,继承性,多态性。 2,如果一个类药设置继承则必须指定NOTFINAL,否则此类无法被继承。 3,如果要对查询出来的数据进行排序,可以使用MAP或ORDER定义函数。 4,在一个类中,默认提供的构造方法需要传递全部的属性内容,如
1,面向对象有3个主要特征,即封装性,继承性,多态性。2,如果一个类药设置继承则必须指定NOTFINAL,否则此类无法被继承。
3,如果要对查询出来的数据进行排序,可以使用MAP或ORDER定义函数。
4,在一个类中,默认提供的构造方法需要传递全部的属性内容,如果用户有需要,也可以利用CONSTRUCTOR来定义制定参数的构造函数。
5,在面向对象中,可以通过子类为父类实例化,这样每一个父类对象所调用的函数会根据覆写此函数子类的不同而实现不同的功能。
6,一个类中可以使用NOT INSTANTIABLE来定义抽象函数,而抽象函数所在的类被称为抽象类,抽象类继承时需要由子类使用OVERRIDING进行函数的覆写。
7,可以根据指定的类创建数据表,这样表中的字段就是类中的属性。
8,通过对象视图,可以将一张数据表中的数据直接以类对象的形式返回。

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