Given a HashMap pre-filled with student names as keys and grades as values, complete main() by reading in the name of a student, outputting their original grade, and then reading in and outputting their new grade. Ex: If the input is: Quincy Wraight 73.1 the output is: Quincy Wraight's original grade: 65.4 Quincy Wraight's new grade: 73.1 1 import java.util.Scanner; 2 import java.util.HashMap; 4 public class StudentGrades { 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 26 public static void main (String[] args) { Scanner scnr = new Scanner(System.in); String studentName; double studentGrade; HashMap studentGrades = new HashMap(); // Students's grades (pre-entered) studentGrades.put("Harry Rawlins", 84.3); studentGrades.put("Stephanie Kong", 91.0); studentGrades.put("Shailen Tennyson", 78.6); studentGrades.put("Quincy Wraight", 65.4); studentGrades.put("Janine Antinori", 98.2); // TODO: Read in new grade for a student, output initial grade, replace with new grade in HashMap, output new grade

Given a HashMap pre-filled with student names as keys and grades as values, complete main() by reading in the name of a student, outputting their original grade, and then reading in and outputting their new grade. Ex: If the input is: Quincy Wraight 73.1 the output is: Quincy Wraight's original grade: 65.4 Quincy Wraight's new grade: 73.1 1 import java.util.Scanner; 2 import java.util.HashMap; 4 public class StudentGrades { 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 26 public static void main (String[] args) { Scanner scnr = new Scanner(System.in); String studentName; double studentGrade; HashMap studentGrades = new HashMap(); // Students's grades (pre-entered) studentGrades.put("Harry Rawlins", 84.3); studentGrades.put("Stephanie Kong", 91.0); studentGrades.put("Shailen Tennyson", 78.6); studentGrades.put("Quincy Wraight", 65.4); studentGrades.put("Janine Antinori", 98.2); // TODO: Read in new grade for a student, output initial grade, replace with new grade in HashMap, output new grade

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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Given a HashMap pre-filled with student names as keys and grades as values, complete main() by reading in the name of a student, outputting their original grade, and then reading in and outputting their new grade. Ex: If the input is: Quincy Wraight 73.1 the output is: Quincy Wraight's original grade: 65.4 Quincy Wraight's new grade: 73.1 import java.util.Scanner;import java.util.HashMap; public class StudentGrades { public static void main (String[] args) { Scanner scnr = new Scanner(System.in); String studentName; double studentGrade; HashMap<String, Double> studentGrades = new HashMap<String, Double>(); // Students's grades (pre-entered) studentGrades.put("Harry Rawlins", 84.3); studentGrades.put("Stephanie Kong", 91.0); studentGrades.put("Shailen Tennyson", 78.6); studentGrades.put("Quincy Wraight", 65.4); studentGrades.put("Janine Antinori", 98.2); // TODO: Read in new grade for a…
In JAVA, use a HashMap to count and store the frequency counts for all the words from a large text document. Then, display the contents of this HashMap with given words and their frequency in the document. Next, please create a set view of the Map and store the contents in an array. Sort this array based on key value and display it. Finally, sort the array in decreasing order by frequency and display it.
Modify the given programs by adding two methods in HashTableClass: Show Full code with output Find and return the item with the maximum key; Find and return average of the keys in the hash table. import java.util.*;public class hashTableClass { public int tableSize; Node[] T; public hashTableClass() { System.out.println("Give the hash table size"); tableSize = Integer.parseInt(new Scanner(System.in).nextLine()); T = new Node[tableSize]; for (int i = 0; i < tableSize; i++) T[i] = null; } public int hashFunction(int Key) { return Key % tableSize; } public Node Search(int Key) { int h = hashFunction(Key); Node current = T[h]; while (current != null && current.item != Key) current = current.link; return current; } public void Insert(int newItem) { int h = hashFunction(newItem); Node current = T[h]; Node newNode = new Node(newItem);…
Imagine a HashMap H with integer as key and value type. We call H.insert(2, 3) and H.insert(2, 5). What does H.get(2) return?* 2 3 5 [3,5]
Modify the given programs by adding two methods in HashTableClass: Find and return the item with the maximum key; Find and return average of the keys in the hash table. import java.util.*;public class hashTableClass { public int tableSize; Node[] T; public hashTableClass() { System.out.println("Give the hash table size"); tableSize = Integer.parseInt(new Scanner(System.in).nextLine()); T = new Node[tableSize]; for (int i = 0; i < tableSize; i++) T[i] = null; } public int hashFunction(int Key) { return Key % tableSize; } public Node Search(int Key) { int h = hashFunction(Key); Node current = T[h]; while (current != null && current.item != Key) current = current.link; return current; } public void Insert(int newItem) { int h = hashFunction(newItem); Node current = T[h]; Node newNode = new Node(newItem); newNode.link = T[h];…
In class HashTable implement a hash table and consider the following:(i) Keys are integers (therefore also negative!) and should be stored in the tableint[] data.(ii) As a hash function take h(x) = (x · 701) mod 2000. The size of the table istherefore 2000. Be careful when computing the index of a negative key. Forexample, the index of the key x = −10 ish(−10) = (−7010) mod 2000 = (2000(−4) + 990) mod 2000 = 990.Hence, indices should be non-negative integers between 0 and 1999!(iii) Implement insert, which takes an integer and inserts it into a table. Themethod returns true, if the insertion is successful. If an element is already inthe table, the function insert should return false.(iv) Implement search, which takes an integer and finds it in the table. The methodreturns true, if the search is successful and false otherwise.(v) Implement delete, which takes an integer and deletes it form the table. Themethod returns true, if the deletion is successful and false otherwise.(vi)…
Create a graphical system that will allow a user to add and removeemployees where each employee has an employee id (a six-digitnumber), an employee name, and years of service. Use the hashcodemethod of the Integer class as your hashing function, and use oneof the Java Collections API implementations of hashing.
In this task, two hash tables should should be implemented. You can follow the followinginstructions:- In class HashTable implement a hash table and consider the following:(i) Keys are integers (therefore also negative!) and should be stored in the tableint[] data.(ii) As a hash function take h(x) = (x · 701) mod 2000. The size of the table istherefore 2000. Be careful when computing the index of a negative key. Forexample, the index of the key x = −10 ish(−10) = (−7010) mod 2000 = (2000(−4) + 990) mod 2000 = 990.Hence, indices should be non-negative integers between 0 and 1999!(iii) Implement insert, which takes an integer and inserts it into a table. Themethod returns true, if the insertion is successful. If an element is already inthe table, the function insert should return false.(iv) Implement search, which takes an integer and finds it in the table. The methodreturns true, if the search is successful and false otherwise.(v) Implement delete, which takes an integer and deletes it…
Import the HashMap and Map classes from the java.util package. Within the main method, a sentence is declared as a string variable and assigned the value "This is a test sentence with no repeating words". Split the sentence into words using the split method and store the result in a String array called "words". Create a new Map called "wordFrequency" that stores each word as a key and the frequency of the word in the sentence as the corresponding value using the HashMap implementation. Use a for loop to iterate through each word in the "words" array. Within the for loop, the code should use the containsKey method to check if the word is already in the Map. If the word is already in the Map, its frequency should be incremented by 1. Use the put method to add the word as the key and the incremented frequency as the value to increment it. If the word is not in the map, add it as a new key with a frequency of 1 as its value. Outside of the for loop, use System.out.println to…
Write a program that uses a HashMap to compute a histogram of positivenumbers entered by the user. The HashMap’s key should be the numberthat is entered, and the value should be a counter of the number of timesthe key has been entered so far. Use −1 as a sentinel value to signal theend of user input. For example, if the user inputs:512355321-1then the program should output the following (not necessarily in this order):The number 3 occurs 2 times.The number 5 occurs 3 times.The number 12 occurs 1 times.The number 21 occurs 1 times.
In JAVA, use a HashMap to count and store the frequency counts for all the words from a large text document. Using file util, please. Then, display the contents of this HashMap with words and frequency count. Next, please create a set view of the Map and store the contents in an array. Sort this array based on key value and display it. Finally, sort the array in decreasing order by frequency and display it as well. Please label your explanation in the code Thank you
Java's HashMap is implemented as a hash table. The put method stores a value with its associated key. Assuming that the put method takes .001 seconds for a HashMap containing 1,000 values, roughly how long would you expect put to take when called on a HashMap containing 100,000 values? Group of answer choices .001s .01s .1s 1.0s 10.0s