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(Subclasses of Account ) In Programming Exercise 9.7, the Account class was defined to model a bank account. An account has the properties account number, balance, annual interest rate, and date created, and methods to deposit and withdraw funds. Create two subclasses for checking and saving accounts. A checking account has an overdraft limit, but a savings account cannot be overdrawn.
Draw the UML diagram for the classes and implement them. Write a test program that creates objects of Account , SavingsAccount , and CheckingAccount and invokes their toString() methods.
Assign each of the following descriptions of matter to one of the following categories: heterogeneous mixture, homogeneous mixture, or pure substance.
a. Two substances present, two phases present
b. Two substances present, one phase present
c. One substance present, two phases present
d. Three substances present, three phases present