Which of the following design concepts is unlikely used to justify the need for a refactoring that moves a method from one class to another class: O Design by contract O Abstract data type O Cohesion O Encapsulation
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- Which of the following statements are true. a) An abstract method contains a signature but no code implementation. b) We cannot create an instance of an abstract class by using the new operator. c) We can derive classes from an abstract class, but we must provide code to implement all of the abstract methods. d) All of the above statements are true.This question involves the design of a class that will be used to produce practice problems. The following StudyPracticeinterface represents practice problems that can be used to study some subject. public interface StudyPractice. { /**Returns the current practive problem */ String getProblem(); /** Changes to the next practice problem */ void nextProblem(); } The MultPractice class is a StudyPracticethat produces multiplication practice problems. A MultPractice object is constructed with two integer values: first integer and initial second integer. The first integer is a value that remains constant and is used as the first integer in every practice problem. The initial second integer is used as the starting value for the second integer in the practice problems. This second value is incremented for each additional practice problem that is produced by the class. For example, a MultPractice object created with the call new MultPractice (7, 3)would be used to create the practice…Which of the following does NOT apply to the strategy design pattern? It can change the behavior of a class at runtime It can eliminate conditional statements It can reduce the communication overhead between objects It provides an alternative to subclassing None of above
- this is the whole problem i did 1 to 3 im stuck at 4 Create a class called Student, with the following attributes/variables:a. studentName (String)b. studentNumber (int)sc. regYear(long)d. faculty(String)e. department(String)2. Add the following methods in Student:a. accessors and mutators for all variablesb. toString methodi. Formulate your toString so that it only shows studentName,studentNumber and faculty3. Create a class called MyFriends, with the following attributes variables:a. studentArray(Student[])4. Add the following methods in MyFriends:a. fillArrayi. Using scanner ask how many students does the user want to inputii. Capture user input for all of his friends(Of course we are assuming all your friends would be similarUWC students, go ask around and meet new friends, alsopreferably not in the same Computer Science department … ifpossible … only if possible)b. maini. Call the fillArray methodii. Count how many Computer Science studentsiii. If half or more students are…Using classes and arrays, the team will develop a set of functions for an onlineshopping system. The system is represented by the following structure:1- Class Item having the following private attributes: (ID, name, quantity, price) andthe following public methods:- Constructors (default, parameterized, and copy)- Setters & Getters- Operator overloading for the ==, +=,-=, >> and << operators Note that the ID member variable is not entered or read from the user. It isautomatically set by the class as a serial ID starting with the first item of ID 1 andincrementing with every new object.2- Class Seller having the following private attributes: (name, email, items,maxItems),where items is a dynamic array of objects of type Item with the size maxItems. Theclass has the following public methods:- Constructor (parameterized)- Operator overloading for the insertion << operators- Add An Item.- This will take an Item object as a parameter:- If the item already exists in the…Which of the following statements will correctly declare an abstract method? A public abstract int getX(){return x;} B public abstract int getX(){} C public abstract int getX(); D public abstract int getX;
- What is the output of the following code where Student is a subclass of Person class? Person s = new Student(); if (s instanceof Student) { System.out.print("This is a student ”); } else { System.out.print("This is a person ”); } This is a student This is a person This is a student This is a person Syntax errorIn Java Program - Encapsulation Write a class Animal with the following attributes: name, age, height and weightProvide constructors: (1)initialize all attributes and (2) initialize all attributes except age with default to 1 (3) default constructorEncapsulate the attributesOverride the toString to output in this manner: (name,age,height,weight)Consider the following Student Class An. EngineeringStudent "is-a" Student whose major is Engineering. In additional to the name, number of credit hours, and GPA, an Engineering electrical, computer, etc. Write the complete defoe the Engineeringstudent class including the implementation of the methods.
- Use the class diagram below to create a money class for an object-oriented parking system. Write your code using java. Classes should contain properties and method implementations. N.B. Try to make your code readabale.Hello! Need help with my Java Homework Please use Eclipse and Add a comments in each program to explain what your code is doing so I can understand it and learn. I really appreciate the help! Examine carefully the UML class diagram Attached: NOTE: Class Reptile was missing a toString() method. It has now been added. class Pet has an attribute of type java.util.Date. no specific dates are required for this attribute. compareTo(Dog) compares Dogs by weight. Create executable class TestPet as follows: create at least one Reptile pet and display it create an array of at least four Dog pets sort the array of Dogs by weight use a foreach loop to fully display all data for all dogs sorted by weight (see sample output) Sample Output Reptile name = Slinky, rock python, M Must be caged, crawls or slithers Not much sound, maybe a hiss, acquired Fri Feb 03 17:06:54 EST 2017 All dogs sorted by weight Dog name = Pedro, chihuahua, M Walks on a leash, weight 14 Barks or howls, acquired Fri…Create a class JobApplicant that holds data about a job applicant. Include a name and four boolean fields that represent whether the applicant is skilled in each of the following areas: word processing, spread sheets, data base and security. The following shows a simple UML diagram with instance variables, constructor, an eligible method, and a display info method. Add in the accessor, mutator etc methods in your program. A qualified applicant has at least three of the four skills. In the eligible method you need to provide such test. The displayInfo method displays the info of an applicant (see below the sample format of printing). In the main method, you must construct at least 4 objects for 4 possible types of applicants. The following show the run time display:
