bada开发中出现这种错.cannot allocate an object of abstract type 'MainForm'?

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bada开发中出现这种错.cannot allocate an object of abstract type 'MainForm'?

bada开发中出现这种错.cannot allocate an object of abstract type 'MainForm'?
bada开发中出现这种错.cannot allocate an object of abstract type 'MainForm'?

bada开发中出现这种错.cannot allocate an object of abstract type 'MainForm'?
在基类中申明的虚函数,在派生类中必须继承并实现.在new一个派生类时才不会报该错误