Create a class named Teacher that can be used to calculate the salaries of different types of teachers. The Teacher class should keep a track of the teacher ID, name, department, salary, and designation with appropriate accessor and mutator methods.
Next, create two additional classes named Lecturer and Professor that are derived from Teacher. Create a method named addBonus (to be overridden by child classes) that returns the salary of the teacher after adding up the bonus. There is a default bonus of Rs. 2000/month of a Teacher. Lecturer have a bonus of Rs. 3000/month and Professor have a bonus of Rs. 5000/month.
Finally, create a display method (to be overridden by child classes) to print the details of the teacher. You may assume the initial salary of a teacher and other necessary values.
Test your classes from a main method.
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