[Solved] A_Class cannot be cast to B_Class?

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Your class hierarchy is:

class Home_Page extends AppCompatActivity
class MainActivity extends AppCompatActivity

This is similar to the following:

class Dog extends Animal
class Cat extends Animal

You can cast a Dog to an Animal, but you can’t cast a Dog to a Cat.

In the same way, you can’t cast a Home_Page to a MainActivity.

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solved A_Class cannot be cast to B_Class?