Create a subclass named Square from the superclass GeometricObject. Create an instance variable named width with initial value 0. Create a no-arg constructor. Create the another constructor, which has one parameter named wid. Assign the wid to the instance variable named width. Create the getWidth() method, the setWidth() method. Override the getArea() method. Override the getPerimeter() method. Create a test class named Test to create an instance with wid= 6 from Square class. Call the getArea() and getPermeter() methods to print out the area and perimeter of the square with width=6.

Create a new project called Family. Add a person class with name, birthDate, and sex private instance variables. Create the public getter and setter methods for each. Create an overloaded constructor that initializes all of the instance variables. Create the default constructor. Override the toString () method to show the Person's info. Create the Person in the main method, and display that person's info. Now add a new instance variable to the Person class of type Person with the identifier spouse. Spouse should be private with setter and getter methods. If you try to instantiate spouse in the contructor, you will get a stack overflow error. Each Person, creates a Person, creates a Person, and so on forever. Try that to see the error and then remove the code from the constructor. Add the following logic: in Person there should be a method to show Spouse. If spouse is null, display or return "Not Married", otherwise call the toString() method. The should also be a get married method....

Implement the inventory manager class. This class must have methods that do the following: Add a new item to the inventory manager. Remove an item from the inventory manager. Re-stock an item in the inventory manager. Display the items in the inventory manager. Search for an item in the inventory manager by at least two criteria (name, price, quantity, etc.). Part 3: Test the inventory manager class with a driver program or unit tests. This may be a console application.

Create a Class Student in which we have three instance variables emp_name, emp_id, and Salary. Write getter and setters for each instance variable. Write another Display method that displays the record of Employee. In Main create five Employee’s Objects. Set their values as required and display as well. In the end Display top three employees with respect to Salary (Display those who have more Salary among all).

Create a TeeShirt class for Lebo’s Tee Shirt Company. Attributes include an order number, size, color, and price. Create set methods for the order number, size, and color and get methods for all four attributes. The price is determined by the size: R122.99 for XXL or XXXL, and R109.99 for all other sizes. Create a subclass named CustomTee that descends from TeeShirt and includes an attribute to hold the slogan requested for the shirt, and include get and set methods this field. The display() method should me an abstract method. Write a test class named DemoTees.java that creates two objects of each class, and demonstrate that all the methods work correctly by communicating to the user to input the tee shirt size, color, and slogan, then display the tee shirt order number, size, color, slogan and price. Format your output to 2 decimal places. The user should be asked to repeat the process or not, (y) indicates yes they want to repeat the process an the process repeats and (n)...

Part 1: Setting the turtle size when it is instantiated Currently, a turtle is created and given a default size of 50. To change the size of the turtle its increaseTurtleSizeBy10 and decreaseTurtleSizeBy10 methods can be called. Add functionality so that a turtle can be created with a specified size. In the DoodleTurtle class do the following: Overload the DoodleTurtle constructor by creating a one-parameter constructor that takes the size of the turtle as an integer. Add an empty method body. Complete the method specification for the new constructor. The default constructor method specification can be used as a model. The only difference will be that the getTurtleSize() will equal the name of the size parameter instead of INITIAL_SIZE. In the method body of the one-parameter constructor do the following in this order: Call the initializeWithDefaultValues helper method. Call the setSize method passing it the size parameter. Compile the program and fix any...

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.

3. Design a user-defined class called Course. Each course object will hold data about a course. The data includes courseID, courseName, credits and instructorName. Define the instance variables required of the appropriate type. Provide only get methods along with toString() and equals() methods. Design another user-defined class called Student. Each student object will hold data on name, GPA and courseList. Make sure to define courseList as an ArrayList holding references to Course objects Implement a constructor that will take values to initialize name, and gpa while courseList is initialized to an ArrayList() object. Provide the following get methods: getStudent ID ( ), getName(), getGPA (), get Gender(), and get CourseList() Note: the getCouresList() method will return a copy of the coureList arraylist with copies of course objects. Provide the following set methods: setName(), setGPA (), setGender() Another method: addCourse () that will take a Course object and add it to the...

Which is true? Group of answer choices A class can implement multiple interfaces A class can inherit from multiple classes A class can implement only one interface An interface can implement multiple classes

Please write the code in Java eclipse.

The Factory method design pattern is advantageous since it enables dynamically creating new objects of a certain kind. True Untrue

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...

This is for pygame Ball Class: The Ball class inherits from Drawable and it will draw a circle at its current location. You must implement at the very least the required methods of the base class (draw and get_rect), as well as a constructor. You may need to implement other methods as part of the public interface. This is the Drawable Class