Develop a class diagram for a Message class for a cell phone company. Include generalizations for child classes TexMessage, VideoMessage and VoiceMessage.

Complete the following class diagram with the correct associations to make our object-oriented parking system complete.

Design a class hierarchy for a simple banking system. Include classes for a Bank, Account, and Customer. Implement methods for depositing and withdrawing money, transferring funds between accounts, and checking the account balance.

Write the constructor method for class Circle which is a subclass of Shape class. Class Shape has one attribute (color) and one constructor (with one parameter). Class circle has attribute for radius.

Write a program in Java to demonstrate and implement the concept of abstract classes.

Design a console program that will print details of DVDs available to buy. Make use of an abstract class DVD with variables that will store the title, yearReleased, running time and price of a DVD. Create a constructor that accepts the title, yearReleased and running time through parameters and assign these to the class variables. Create an abstract set method for the price of a DVD; also create get methods for the variables.Create a subclass InstructionalDVD that extends the DVD class and implements an iPrintable interface. The interface that must be added is shown below:public interface iPrintable { String ShowDetails();}The InstructionalDVD subclass has a private variable named category for which a get method must be written. The constructor of the InstructionalDVD class must accept the title, yearReleased, running time and category through parameters. Write the code for the setPrice() and ShowDetails() methods.Write a useDVD class and instantiate 2 objects of the InstructionalDVD…

in java language...   Draw the UML diagram of the following class: public class Employee {   String name;   double salary;     public Employee() {   }   public double getSalary() {    return this.salary;   }   public String getName() {   return this.name;   } }

In the class diagram below we have a money class for an object-oriented parking system that is to be designed using java. Briefly explain any implementation decisions and the reasoning behind those without writing the complete code. N.B explain how the implementation will proceed instead of writing code

• 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 then implement them. Write a test program that creates objects of Account, SavingsAccount, and CheckingAccount and invokes their toString() methods.

Suppose a parent class has a few methods that the child would like to use, but the methods are not appropriate for the child.  What can the child do to make the methods 'usable' for itself?