Design and produce a Java program that simulates an ATM machine.You are required to implement and demonstrate an understanding of the following Java constructs within your program:

• Classes
• Methods
• Constructors
• Decision making
• collections
• Iteration
• Error handling

The following assumptions are to be taken into consideration when developing the program:

• Username and password (or PIN) are used instead of a bank card.
• Your program will contain a few users for testing.
• Users will have different account types (saving, current, business).
• Your program will run as a console application.
• Your program should consist of a number of classes.
• The Main class should remain free from unnecessary code.

Program Specifications

Your program will illustrate the following specifications:

1. The user will be asked for username
2. If username is valid, the user will be asked to enter password (or PIN)
3. The main menu is then displayed (check balance, withdraw, deposit, change password (or PIN), Quit). Each option will display a sub-menu (except quit).
4. After each function, the main menu is displayed again.
5. If Quit, the program will go back to step 1