2. Write a class ArrayClass, where the main method asks the user to enter the fournum bers. Create a method printArray that prints the array whenever required (useAcrav.toString method). Make the program run as shown in the Sample Run below.Green is user input.Use Attax.sort, Attach.bianrySearch. AttaveaualsSample RunList1, Enter four num bers: 2 33 2List2, Enter four num bers: 6 25 4List3, Enter four num bers: 52 46Your original Listi: [2, 3, 3, 2]Your original List2: [6, 2, 5, 4]Your original List3: [5, 2, 4, 6]Sorted Listi is: [2, 2, 3, 3]Enter a number from the sorted List1 to search for: 3Value 3 is in index 2 (or position 3)List that are the same when sorted: [2, 4, 5, 6]

Java code: import java.util.Scanner;import java.util.Arrays; public class ArrayClass{ public…

2. Write a class ArravClass, where the main method asks the user to enter the f num bers. Create a method printArray that prints the array whenever required Array tostring method). Make the program run as shown in the Sam ple Run be Green is user input. Use Artav.sort, Attach.bianrySearch, Attav.eauals

2. Write a class ArravClass, where the main method asks the user to enter the f num bers. Create a method printArray that prints the array whenever required Array tostring method). Make the program run as shown in the Sam ple Run be Green is user input. Use Artav.sort, Attach.bianrySearch, Attav.eauals

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a class ArrayClass, where the main method asks the user to enter the four numbers. Create a method printArray that prints the array whenever required (use Array.toString method). Make the program run as shown in the Sample Run below. Use Array.sort, Arrach.bianrySearch, Array.equals
Write a class ArrayMethods, where the main method asks the user to enter thenumber of inputs and stores them in an array called myList. Create a methodprintArray that prints the array myList. Create another method copyArray that copiesthe array using System.arraycopy, and multiplies each element in the copied array by2, then finally returns the array to the main method. Invoke the printArray again toprint the array returned by copyArray. In summary, see below. (!5 points)• main method does: asks user for inputs and stores in array. Invoke printArray. Invoke copyArray.Invoke printArray again.• printArray: void method, parameters passed is an array, prints an array• copyArray: array-returning method, parameters passed is an array, copies array, multiplies 2 to eachelement in the copied array, returns the copied arraySample RunEnter the number of items: 4Enter the numbers: 2 3 4 6Your printed array: 2 3 4 6Your copied printed array: 4 6 8 122. Write a class ArrayClass, where the main…
Write a class ArrayMethods, where the main method asks the user to enter the number of inputs and stores them in an array called myList. Create a method printArray that prints the array myList. Create another method copyArray that copies the array using System.arraycopy, and multiplies each element in the copied array by 2, then finally returns the array to the main method. Invoke the printArray again to print the array returned by copyArray.
Write a class ArrayMethods, where the main method asks the user to enter the number of inputs and stores them in an array called myList. Create a method printArray that prints the array myList. Create another method copy Array that copies the array using System.arraycopy, and multiplies each element in the copied array by 2, then finally returns the array to the main method. Invoke the printArray again to print the array returned by copyArray. Sample RunEnter the number of items: 4Enter the numbers: 2 3 4 6Your printed array: 2 3 4 6Your copied printed array: 4 6 8 12
Write a class AnalyzeNumbers which asks the user to enter the number of inputs andstores them in an Array, then prints the Array that was inputted, calculates the sum ofthe numbers entered and prints the total numbers greater than the first inputtednumber: Two Sample RunsEnter the number of items: 5Enter the numbers: 3.4 5 6 7.1 9You inputted: 3.4 5.0 6.0 7.1 9.0Sum is: 30.5Number of elements greater than the first element: 4 Enter the number of items: 3Enter the numbers: 6.7 1.5 3.2You inputted: 6.7 1.5 3.2Sum is: 11.4Number of elements greater than the first element: 0
Create a class called Employee with threeattributes: Name, Salary and Id. Make constructors, getters, setters, tostring, displayand compareTo methods. Write a method qsort(e) that will accept an array ofEmployees and sort the results by ID. Write a method bsearch(e, id) that will accept asorted array of Employees and use a binary searchalgorithm to find a specific employee by Id.In your test driver create an array with 10employees. Be sure to populate that data sothat the ids are in random order. Display the array, call qsort then display it again andcall the bsearch with a valid id and an invalid id.
Assume Student and GradeBook classes are defined as follows: public class Student { int id; double testsMarks[]; public double getAverage(){ double sum = 0; for(double marks : testsMarks) { sum+=marks; } return sum/testsMarks.length; } } import java.util.ArrayList; public class GradeBook { String subject; ArrayList<Student> students; public Student getStudentWithMinAverage(){ } } Define the body of getStudentWithMinAverage method that shall return the student object from students ArrayList who got minimum average marks in the class. (Please write minimum code and make use of provided code, making no change in classes' structure)
Complete the Course class by implementing the printRoster() method, which outputs a list of all students enrolled in a course and also the total number of students in the course. 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 fields: first name, last name, and GPA. (Hint: toString() returns a String representation of the Student object.) Ex: If the following students and their GPA values are added to a course: Henry Cabot with 3.5 GPABrenda Stern with 2.0 GPAJane Flynn with 3.9 GPALynda Robison with 3.2 GPA then the program output is: Henry Cabot (GPA: 3.5) Brenda Stern (GPA: 2.0) Jane Flynn (GPA: 3.9) Lynda Robison (GPA: 3.2) Students: 4 course.java import java.util.ArrayList; // Class representing a studentpublic class Course { private ArrayList<Student> roster; // Collection of Student objects public Course() {…
A 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 ============================================…
PLease use java In this assignment, you will implement a class called ArrayAndArrayList. This class includessome interesting methods for working with Arrays and ArrayLists.For example, the ArrayAndArrayList class has a “findMax” method which finds and returns themax number in a given array. For a defined array: int[] array = {1, 3, 5, 7, 9}, callingfindMax(array) will return 9.There are 4 methods that need to be implemented in the ArrayAndArrayList class:● howMany(int[] array, int element) - Counts the number of occurrences of the givenelement in the given array.● findMax(int[] array) - Finds the max number in the given array.● maxArray(int[] array) - Keeps track of every occurrence of the max number in the givenarray.● swapZero(int[] array) - Puts all of the zeros in the given array, at the end of the givenarray.Each method has been defined for you, but without the code. See the javadoc for each methodfor instructions on what the method is supposed to do and how to write the code. It…
Use this exercise to test your code that you wrote in the previous exercise. CookBook Class In this exercise, you are going to complete the CookBook class. public class CookBook { private ArrayList<Recipe> recipes; private String name; public CookBook(String name){ this.name = name; recipes = new ArrayList<Recipe>(); } /** * This method adds a recipe to the ArrayList of Recipes * @param recipe a recipe object to be added to the list */ public void addRecipe(Recipe recipe){ /* Implement this method */ } /** * This method removes all recipes from the * ArrayList of Recipes where the title matches the input * string * * @param title the title of the recipe to remove * @return the number of recipes removed */ public int removeRecipe(String title){ /* Implement this method */ } /** * This method lists the title of all the recipes in the * cook book * */ public void listAll(){ /* Implement this method */ } } The addRecipe method should take a recipe and add it to the end of the…
The Utilities class contains three independent static methods and contains no fields (none should be added).The Utilities class contains the following 3 static methods that you must implement:1. QWERTY – If the argument is null, the length is anything other than 6, or if the element values are outside the inclusive boundof 1 to 7 throw the IllegalArgumentException with the message "Invalid parameter". Otherwise return a char array that hasinput[0] instances of 'Q', followed by input[1] instance of 'W', ....followed by input[5] instances of 'Y'. The length ofthe returned array should be the exact size needed to accommodate all the letters (no smaller or larger).2. turnTo1D – You can assume that the parameter array has at least 1 row and all rows are int array (might be an empty int array)and the parameter delta is a positive integer. The method returns a 1D array (possibly empty array) with all the values inarray that are in the range of the inclusive bound [value – delta to value +…