Discuss the concept of method overriding. Write a program to create Person class with variables id, and name. Include methods getPerson() and showPerson() in the class. Again, create another class named Employee, which is child of person class. Include member variable salary, and methods getEmployee(), and showEmployee() in the class. Again, create a third class named Typist, which is child of Employee. Include variable typespeed, and methods getTypist(), and showTypist() in the class. Finally, create two objects of Typist class and read and display their details.[10]

Write a java program to create a UI with four labels and three text boxes for Principal, Time, Rate, and Interest. Also put two buttons "Simple Interest" and Reset in the form and handle the event accordingly.[10]

How JSP differs from servlets? Discuss various methods of writing servlet programs with suitable example.[10]