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private class MyClass extends Object class UyClass extends Object public class MyClass private class MyClass extends Object
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CREATE CLASS mylib OF student AS Pcrson CREATE CLASS student OF Person AS mylib CREATE CLASS student OF mylib AS Person CREATE CLASS Person OF mylib AS student
CREATE CLASS mylib OF student As PerSon CREATE CLASS studem OF Pemon As mylib CREATE CLASS Student OF mylib As PerSon CREATE CLASS Person OF mylib As student
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VFP将用户自定义子类保存在扩展名为.vcx的类库文件中 一个VFP类库文件中可以保存多个自定义子类 只能基于VFP的基类创建子类 在VFP中,可以使用“类设计器”或“表单设计器”创建子类