Absolute Java (6th Edition)
6th Edition
ISBN: 9780134041674
Author: Walter Savitch, Kenrick Mock
Publisher: PEARSON
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Chapter 14, Problem 4PP
Write a generic class, Marks, with a type parameter M where M is a numeric object type (e.g., integer. Double, or any class that extends
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PART 1 : Automobiles
Create a data class named Automobile that implements the Comparable interface. Give the class data fields for make, model, year, and price. Then add a constructor, all getters, a toString method that shows all attribute values, and implement Comparable by using the year as the criterion for comparing instances.
Write a program named TestAutos that creates an ArrayList of five or six Automobiles. Use a for loop to display the elements in the ArrayList. Sort the Arraylist of autos by year with Collections.sort(). Finally, use a foreach loop to display the ArrayList sorted by year.
Create a generic class with a type parameter that simulates drawing an item at random out of a box. This class could
be used for simulating a random drawing. For example, the box might contain Strings representing names written
on a slip of paper, or the box might contain Integers representing a random drawing for a lottery based on numeric
lottery picks. Create an add method that allows the user of the class to add an object of the specified type along with
an isEmpty method that determines whether or not the box is empty. Finally, your class should have a drawItem
method that randomly selects an object from the box and returns it. If the user attempts to drawn an item out of an
empty box, return null. Write a main method that tests your class.
Design a generic method 'sum' that accepts an array of any type such as int, double or float and this method will return the sum of all elements in the array. Create a test class and call 'sum twice by passing arrays of different types.
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Absolute Java (6th Edition)
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- Write a static method that takes an array of a generic type as its only argument. The method should display the array and return the number of elements in the array. Test the method in main with at least three arrays of objects. SAMPLE OUTPUT Here is an Integer array 12 21 7 16 8 13 That array held 6 elements Here is a String array one two three four That array held 4 elements Here is a Double array 1.1 2.2 3.3 4.4 5.5 That array held 5 elements My code: package radosavljevic19part1; import java.util.ArrayList;import java.util.Arrays; public class CreatorOfArray {public static void main(String[]args) {//creating array in three different typesInteger[]arr1= {12, 21, 7, 16, 8, 13};String []arr2={"one", "two", "three", "four"};Double[]arr3={1.1, 2.2, 3.3, 4.4, 5.5};//display arrays System.out.println("Here is an integer array: ");printList(arr1);System.out.println("\nHere is a String array: ");printList(arr2); System.out.println("\nHere is a Double array: ");printList(arr3);}//generic…arrow_forwardwrite a class called rectangle that implements the Comparable The class should contain three fields: height (int), width (int), topCorner (Point). Write the necessary constructors, accessors, mutators and other methods. The Point class is given below. write a client class, rectangleClient that creates an Array of ten Rectangle objects called Array1. Print the Array. Sort the elements according to the height. If the height of any objects are equal, then sort according to width and if the width are still equal as well, then sort according topCorner (hint: call the Point.compareTo() method). Print the sorted list. public class Point implements Comparable<Point> { private int x; private int y; public Point() { this(0, 0); } public Point(int x, int y) { this.x=x; this.y=y; } public int getX() { return x; } public int getY() { return y; } public String toString() { return "(" + x + ", " + y…arrow_forwardA supermarket wants to reward its best customer of each day, showing the customer’s name on a screen in the supermarket. For that purpose, the store keeps an ArrayList.Create a class customer having id, name, gender, and bill provide appropriate getters/setters and constructors also provide toString method.In the Store class, make an ArrayList of customers, store name, and address implement methods public void addSale(Customer c) that will add customers to the arraylist.public void RemoveCustomer(int id);public void UpdateCustomerRecord(int Id);public displayAll();public String nameOfBestCustomer() to record the sale and return the name of the customer with the largest sale. public ArrayList nameOfBestCustomers(int topN) so that it displays the top customers, that is, the topN customers with the largest sales, where topN is a value that the user of the program supplies. Write a program that prompts following menu and ============================================…arrow_forward
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- Complete the Course class by implementing the findStudentHighestGpa() method, which returns the Student object with the highest GPA in the course. Assume that no two students have the same highest GPA. Given classes: Class Course represents a course, which contains an ArrayList of Student objects as a course roster. (Type your code in here.) Class Student represents a classroom student, which has three private fields: first name, last name, and GPA. (Hint: GetGPA() returns a student's GPA.) Ex: If the following students and their GPA values are added to a course: Henry Nguyen with 3.5 GPABrenda Stern with 2.0 GPALynda Robison with 3.2 GPASonya King with 3.9 GPA then the findHighestStudent() method returns a student and the program output is: Top student: Sonya King (GPA: 3.9)Code:Course.java: import java.util.ArrayList; //create class Student //create class Courseclass Courses{ private ArrayList<Student> roster; // collection of Student object // class constructor…arrow_forward1. Write a generic method named array_prod() that takes an array of a generic type are returns the product of the values in the elements in the array. Make sure that the generic type extends the Number class. The Number class is defined in the java.lang package. 2. Complete the main() method to find the products of the elements in the provided arrays. Print the results in the main method using 3 decimals.arrow_forwardAssume the existence of a Widget class that implements the Comparable interface and thus has a compareTo method that accepts an Object parameter and returns an int. Write an efficient static method, getWidgetMatch, that has two parameters. The first parameter is a reference to a Widget object. The second parameter is a potentially very large array of Widget objects that has been sorted in ascending order based on the Widget compareTo method. The getWidgetMatch searches for an element in the array that matches the first parameter on the basis of the equals method and returns true if found and false otherwise.arrow_forward
- write a java method with followin instraction : Write a method called prioritizeQueue to give priority for vaccination for elderly persons. The method is to be in a class called VaccinationQueue and has two parameters q1 and q2 type ArrayQueue. The q1 and q2 data are of type Integer. Assume that initially q1 is not empty and q2 is empty. The method will insert from q1 those elements towards the beginning of the queue (front) q2 whose data is greater than or equal to 45 and will insert those elements whose data is less than 45 and greater than or equal to 18 towards the end (rear) of q2. Any data item less than 18 of q1 will not be inserted in q2. It returns the number of elements added to q2. Class ArrayQueue and all its methods including iterator are available for use. You can also create temporary queues. You are not allowed to use arrays or any other data structure. Example: Before method call: front rear q1: 14 25 50…arrow_forwardEclipseIDE - Java Programming assigment For your program: Create a data class named Automobile that implements the Comparable interface. Give the class data fields for make, model, year, and price. Then add a constructor, all getters, a toString method that shows all attribute values, and implement Comparable by using the year as the criterion for comparing instances. Write a program named TestAutos that creates an ArrayList of five or six Automobiles. Use a for loop to display the elements in the ArrayList. Sort the Arraylist of autos by year with Collections.sort(). Finally, use a foreach loop to display the ArrayList sorted by year.arrow_forwardProvide a different implementation of ChoiceQuestion. Instead of storing the choices in an array list, the addChoice method should add the choice to the question text. For this purpose, an addLine method has been added to the Question class. /** A question with multiple choices.*/public class ChoiceQuestion extends Question{ // Add any needed instance variables, but don't store the choices // The choices should be added to the text of the superclass /* code goes here */ /** Constructs a choice question with a given text and no choices. @param questionText the text of this question */ public ChoiceQuestion(String questionText) { /code goes here */ } /** Adds an answer choice to this question. @param choice the choice to add @param correct true if this is the correct choice, false otherwise */ public void addChoice(String choice, boolean correct) { /* code goes here */ } }arrow_forward
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