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- A class may occasionally be dependent upon itself. In other words, an object of one class engages in communication with an object of the same class. To do this, a method of the class can take an object of the same class as a parameter.An illustration of this scenario is the concat method of the String class. One String object calls the method, while another String object is supplied as an argument. Here's an illustration:str2 = str1.concat;The String object (str1) that executes the method adds its characters to the String (str2) that was supplied as a parameter. As a result, a fresh String object is produced and saved as str3. Write Java code to put the circumstances given into effect.Write a class with a constructor that accepts a String object as its argument. The class should have a method that returns the number of b, c, d, f, g, h, and z in the string. Demonstrate the class in a program that asks the user to enter a string and returns the number of b, c, d, f, g, h, and z in the user string.DescriptionIn this assignment, you are required to implement an electronic programming quiz system. User can createquestions and preview the quiz.Your TaskYou are asked to write a Java program for the programming quiz system. There are two types of questions:Multiple Choice Question and Ture/False Question. User can create questions using the system; andpreview the quiz, which display all questions in the system one by one. During the preview, the user canattempt the quiz by entering his/her answers to questions. The system will then immediately check theanswer and calculate. After attempting all questions, the total score will be displayed. A sample run of theprogram is shown as below (Green text refers to user input): Please choose (c)reate a question, (p)review or (e)xit >> cEnter the type of question (MC or TF) >> MCEnter the question text >> Each primitive type in Java has a correspondingclass contained in the java.lang package. These classes are called…
- UOWD Library is asking you to write a Java program that manages all the items in the Library. The library has books, journals, and media (DVD for example). All items have a name, author(s), and year of publication. A journal also has a volume number, while a media has a type (audio/video/interactive). The user of your program should be able to add an item, delete an item, change information of an item, list all items in a specific category (book, journal, or media), and print all items (from all categories). A menu asks the user which operation s/he wants to perform. Important: make use of collections, inheritance, interfaces, and exception handling wherever appropriate.Write a program to print the names of books by creating a book class. If no name is passed while creating an object of book class, then the name should be "Unknown", otherwise the name should be equal to the String value passed while creating object of book class.The Hal9000 has one constructor which takes a String parameter of a name of the crew member it is interacting with. It has methods: public String getName() which gets the name public void setName(String newName) which sets a new name public String greet() which returns a string consisting of "Greetings, name" where name is the name supplied in the constructor. public String reportStatus() which returns a string consisting of "All systems are operating normally, name" where name is the name supplied in the constructor. public String execute(String command) which returns a string consisting of "I am sorry, name. I can't " + command where name is the name supplied in the constructor and command is the parameter.
- In some cases, a class depends on itself. That is, an object of one class interactswith another object of the same class. To accomplish this, a method of the classmay accept as a parameter an object of the same class.The concat method of the String class is an example of this situation. Themethod is executed through one String object and is passed another String object as a parameter. Here is an example:str3 = str1.concat(str2);The String object executing the method (str1) appends its characters to thoseof the String passed as a parameter (str2). A new String object is returned asa result and stored as str3. Write java code to implement given conditionsimplement the program as described and submit as a .java file. Roman numbers. Write a program that converts a positive integer into the Romannumber system. The Roman number system has digits the first image would be here Numbers are formed according to the following rules:a. Only numbers up to 3,999 are represented. b. As in the decimal system, the thousands, hundreds, tens, and ones areexpressed separately. c. The numbers 1 to 9 are expressed as the second image would be here As you can see, an I preceding a V or X is subtracted from the value, and youcan never have more than three I’s in a row. d. Tens and hundreds are done the same way, except that the letters X, L, C and C,D, M are used instead of I, V, X, respectively.Your program should take an input, such as 1978, and convert it to Roman numerals,MCMLXXVIII.The Hal9000 has one constructor which takes a String parameter of a name of the crew member it is interacting with. It has methods: public String getName() which gets the name public void setName(String newName) which sets a new name public String greet() which returns a string consisting of "Greetings, name" where name is the name supplied in the constructor. public String reportStatus() which returns a string consisting of "All systems are operating normally, name" where name is the name supplied in the constructor. public String execute(String command) which returns a string consisting of "I am sorry, name. I can't " + command where name is the name supplied in the constructor and command is the parameter. Supply Javadoc for the constructor and all the methods
- Design a program in Visual Basic.net languages to test a username and password using a method users information: username: OMAR Password: ADlreMlpfeN1 Second user username: MOHAMED Password: 12lre34pfe56 When the user write username: OMAR and Password: ADMIN1 or write username: MOHAMED and Password:123456 open another Form.Write a program that draws a fixed rectangle centered at (100, 60) with width 100 and height 40. Whenever the mouse is moved, display the message indicating whether the mouse pointer is inside the rectangle, as shown in Figure 9.32. To detect whether the pointer is inside a rectangle, use theRectangle2D class defined in Exercise 8.19.Some Websites impose certain rules for passwords, involving use of certain numbers and special characters. Write a Python program (Console and GUI) that prompts the user to enter a password and displays "valid password" if the rule is follows rules of the company, or "invalid password" otherwise. Write a method or a function for implementing the password checking rules for the method/function as follows: A password must have at least eight characters. A password must consist of only letters and digits. A password must contain at least two digits. Sample 1 Enter a string for password: wewew43x valid password Sample 2 Enter a string for password: 343a invalid password