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- Objectives: At the end of this activity, you should be able to: define classes implement polymorphism and inheritance instantiate an object array apply Exception to all input validations create a Java application for multiple users Procedure: Create a NetBeans project for this activity. The project name should be as follows: o Client (the main class that contains the main method and the implementation of the main menu) o Credit (the class where attributes and methods are defined) The class names to be created are the following: o Client<your_last_name> Ex. ClientBlancoo Credit<your_last_name> Ex. CreditBlanco All class names must be suffixed with your last name. Note that the object to be instantiated in the main method is an object array.For example: CreditBlanco [ ] cb = new CreditBlanco [100]; Compress the NetBeans project into .rar or .zip format and then upload to the link provided in the LMS. Only NetBeans project compressed in .rar or .zip format will be…Which of the following statements are true? Group of answer choices 1. A superclass reimplements the functionality of its subclasses. 2. A class that implements an interface reuses the functionality of the interface. 3. A derived class reuses the functionality instead of reimplements it. 4. If a class has no bugs, we can inherit from it without fear of having any bugs in our class.Which of the following statements is false? a. A class can contain only one constructor. b. An example of a behavior is the SetTime method in a Time class. c. An object created from a class is referred to as an instance of the class. d. An instance of a class is considered an object.
- Create an application class named LetterDemo that instantiates objects of two classes named Letter and CertifiedLetter and that demonstrates all their methods. The classes are used by a company to keep track of letters they mail to clients. The Letter class includes auto-implemented properties for the name of the recipient and the date mailed. Also, include a ToString() method that overrides the Object classs ToString() method and returns a string that contains the name of the class (using CetType and the Letters data field values. Create a child class named CertifiedLetter that includes an auto-implemented property that holds a tracking number for the letter.What kind of member of a class supports information hiding? Group of answer choices The private, proctive and public members. The private members. The protective members. The public members. The private and protective members.If a class has this method, it is called automatically just before an instance of the class is destroyed by the Java Virtual Machine.a. finalizeb. destroyc. removed. housekeeper
- Create a RobotFriend class. RobotFriend is a new toy just on the market. Copy the starter class and the tester from Codecheck. A RobotFriend has a name and replies to various commands Provide a constructor that takes the name of the RobotFriend as a parameter. Remember that a constructor has the same name as the class. What does the class need to remember? That is the instance variable. Provide the following methods: public String getName() gets the name of this RobotFriend public void setName(String newName) sets a new name for this RobotFriend public String whatDoYouNeed() returns a string consisting of name + " needs a battery charge" where name is the name of this RobotFriend (which was supplied in the constructor) public String doCommand(String whatToDo) returns a string consisting of "Your friend " + name + " does not " + whatToDo where name is the name of this RobotFriend and whatToDo is the parameterUser: Make a class called User. Create two attributes called first_name and last_name,and then create several other attributes that are typically stored in a user profile. Makea method called desctibe_user() that prints a summary of the user's information. Makeanother method called greet_user() that prints a personalized greeting to the user.Then - Create several instances representing different users, and call both methods for each user. Admin: Write a class called Admin that inherits from the User class. Add an attribute,privileges, that stores a list of strings like "can add post”, "can delete post”, "can banuser”, and so on. Write a method called show_privileges() that lists the administrator'sset of privileges. Then - Create an instance of Admin, and call your method.A. You can invoke an instance method or reference an instance variable from a static method. B. You can invoke a static method or reference a static variable from an instance method. * Options: Only A is true Both A and B are true Both A and B are false Only B is true Note: Answer the correct option
- Create an application named RecoveringDemo that declares objects of three types: Patient, Upholsterer, and FootballPlayer. Create an interface named IRecoverable that contains a single method named Recover(). Create the classes named Patient, Upholsterer, and FootballPlayer so that each implements IRecoverable. Create each class’s Recover() method to display an appropriate message. For example: The Patient’s Recover() method should display I am getting better. The Upholsterer's Recover() method should display I have new material for the couch. The FootballPlayer's Recover() method should display I picked up the ball after a fumble.Write a class named Student. The class contains:■ Private String data field “name” that refers to the name of the student.■ Private integer data field “id” that refers to the student id.■ Private Date data field “dateCreated” that refers to the current date when anew object Student is created.■ A constructor that creates a new instance of the class student with the specifiedname and id.■ Three methods named getName(), getID() and getDateCreated() that returnrespectively the name, the id and the date when the student object was created.■ A toString() method that return a String representation of the student.2. Write a class named Course. The class contains:■ Private String data field “courseName” that refers to the name of the course.■ Private integer data field “capacity” that refers to the capacity of the course(default value 10).■ Private ArrayList of students that contains the students registered in thecourse.■ A constructor that creates a new course with the specified name.■ A…1) Create class Cat Add properties What characteristics do they have? Name, age, color, type (domestic / feral), etc. What color(s) might they have? White, cream, fawn, Cinnamon, Chocolate, Red, Lilac, Blue, Black,Lavender, etc. Add methods eat(), play(), etc. Constructors? A class provides a special type of methods, known as constructors, which areinvoked to construct objects from the class Create 2 different constructor with different initialization parameters How to get the number of cats?Add a static variable and a static method Test Cat class by creating 2 Cat instances 2) create a class AbstractCat with the sameproperties and methods as Cat... Create class AbstractCat. How to secure data?To protect it from direct access and manipulation from outside of the classwe need to make our instance data fields private. To let clients still manipulate data under our control we can provide thempublic getters and setters. create getters, setters, constructors and toString() Test…