1. a. The Talk-A-Lot Cell Phone Company provides phone services for its customers. Create an abstract class named PhoneCall that includes a String field for a phone number and a double field for the price of the call. Also include a constructor that requires a phone number parameter and that sets the price to 0.0. Include a set method for the price. Also include three abstract get methods-one that returns the phone number, another that returns the price of the call, and a third that displays information about the call. Create two child classes of PhoneCall: IncomingPhoneCall and OutgoingPhoneCall. The IncomingPhoneCall constructor passes its phone number parameter to its parent's constructor and sets the price of the call to 0.02. The method that displays the phone call information displays the phone number, the rate, and thepriceofthecall(whichisthesameastherate). The OutgoingPhoneCall class includes an additional field that holds the time of the call in minutes. The constructor requires both a phone number and the time. The price is 0.04 per minute, and the display method shows the details of the call, including the phonenumber, the rate per minute, thenumber of minutes, and the total price. Write an application that demonstrates you can instantiate and display both IncomingPhoneCall and OutgoingPhoneCall objects. Save the files as PhoneCall.java, IncomingPhoneCall.java, OutgoingPhoneCall.java, and DemoPhoneCalls.java.

b. Write an application in which you assign data to a mix of 10 IncomingPhoneCall and OutgoingPhoneCall objects into an array. Use a for loop to display the data. Save the file as PhoneCallArray.java.

2. Create an abstract Division class with fields for a company's division name and account number, and an abstract display() method. Use a constructor in the superclass that requires values for both fields. Create two subclasses named InternationalDivision and DomesticDivision. The InternationalDivision includes a field for the country in which the division is located and a field for the language spoken; its constructor requires both. The DomesticDivision includes a field for the state in which the division is located; a value for this field is required by the constructor. Write an application named UseDivision that creates InternationalDivision and DomesticDivision objects for two different companies and displays information about them. Save the files as Division.java, InternationalDivision.java, DomesticDivision.java, and UseDivision.java.

3. Create an abstract class named Element that holds properties of elements, including their symbol, atomic number, and atomic weight. Include a constructor that requires values for all three properties and a get method for each value. (For example, the symbol for carbon is C, its atomic number is 6, and its atomic weight is 12.01. You can find these values by reading a periodic table in a chemistry reference or by searching the Web.) Also include an abstract method named describeElement(). Create two extended classes named MetalElement and NonMetalElement. Each contains a describeElement() method that displays the details of the element and a brief explanation of the properties of the element type. For example, metals are good conductors of electricity, while nonmetals are poor conductors. Write an application named ElementArray that creates and displays an array that holds at least two elements of each type. Save the files as Element.java, MetalElement.java, NonMetalElement.java, and ElementArray.java.