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- Using Java - write a new class called Rack, to store an ArrayList of Tiles, to sort them using the Selection Sort algorithm, and finish the program. Code: class Main { publicstaticvoid main(String[] args) { Rack craigTiles = new Rack(); craigTiles.addTile(new Tile('H', 4)); craigTiles.addTile(new Tile('E', 1)); craigTiles.addTile(new Tile('L', 1)); craigTiles.addTile(new Tile('L', 1)); craigTiles.addTile(new Tile('O', 1)); craigTiles.addTile(new Tile('Z', 10)); craigTiles.addTile(new Tile('Y', 4)); craigTiles.sortHighToLow(); System.out.println("Craig's rack of tiles, in order from most valuable to least:"); System.out.println(craigTiles); Rack bettoTiles = new Rack(); bettoTiles.addTile(new Tile('E', 1)); bettoTiles.addTile(new Tile('A', 1)); bettoTiles.addTile(new Tile('S', 1)); bettoTiles.addTile(new Tile('D', 2)); bettoTiles.addTile(new Tile('W', 4)); bettoTiles.addTile(new Tile('T', 1)); bettoTiles.addTile(new Tile('N', 1)); bettoTiles.sortHighToLow();…Write a method swapArrayEnds() that swaps the first and last elements of its array parameter. Ex: sortArray = {10, 20, 30, 40} becomes {40, 20, 30, 10}. import java.util.Scanner; public class ModifyArray { /* Your solution goes here */ public static void main (String [] args) { Scanner scnr = new Scanner(System.in); int numElem = 4; int[] sortArray = new int[numElem]; int i; int userNum; for (i = 0; i < sortArray.length; ++i) { sortArray[i] = scnr.nextInt();} swapArrayEnds(sortArray); for (i = 0; i < sortArray.length; ++i) { System.out.print(sortArray[i]); System.out.print(" ");} System.out.println("");}}Provide 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. Use the following files: Question.java /** A question with a text and an answer.*/public class Question{ private String text; private String answer; /** Constructs a question with empty text and empty answer. */ public Question() { text = ""; answer = ""; } /** Sets the answer for this question. @param correctResponse the answer */ public void setAnswer(String correctResponse) { answer = correctResponse; } /** Checks a given response for correctness. @param response the response to check @return true if the response was correct, false otherwise */ public boolean checkAnswer(String response) { return response.equals(answer); } /** Add a line of text to…
- Write a Java method that takes two 2 dimensional int arrays (a and b) anda 2 dimensional boolean array (c) where all three arrays have the samesize. Your method should return an array (result) such that, if a particular element in c is true, then the corresponding (same indexed) elementin result must be the multiplication of the the corresponding elements ofa and b. If the element in c is false, then the the corresponding elementin result must be the negative of multiplication of the the correspondingelement in a and b.Write a static method randomFixedLengthWordsthat takes int values N and W as arguments and returns an array of N string values thatare each strings of W characters from the alphabet.The split method in the String class returns an array of strings consisting of the substrings split by the delimiters. However, the delimiters are not returned. Implement the following new method that returns an array of strings consisting of the substrings split by the matching delimiters, including the matching delimiters. public static String[] split(String s, String regex) For example, split("ab#12#453", "#") returns ab, #, 12, #, and 453 in an array of String and split("a?b?gf#e", "[?#]") returns a, ?, b, ?, gf, #, and e in an array of String.
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- The input to this method is supposedly an ArrayList of integers that ranges from 1 to 100, however this is not exactly the case. Sometimes, there will be gaps in the range for example, the range could be: [1 2 ... 7 8 ... 99 100], with missing ranges in between. Find all the missing numbers from the range, add them to an ArrayList, return the ArrayList. import java.util.ArrayList;public class FindMissingNums{public static ArrayList<Integer> solution(ArrayList<Integer> nums){// ↓↓↓↓ your code goes here ↓↓↓↓return new ArrayList<>();}}java Write a method that takes rows and columns as a parameter, and returns a 2D array of the designated size, filled with empty Strings. I currently have public static String[][] createArray(int row, int col) { String[][]arr=new String[row][col]; return arr; } but it returns the 2d array filled with null?Implement a new concat method in the String class you worked on for HW2. The method should return a new String object that represents the text you would end up with if the argument String were "added onto the end of" this String. For example, in the code below, the String object answer should represent the text "bookstore" and true should be printed the screen. char[] bookA = {'b', 'o', 'o', 'k'}; char[] storeA = {'s', 't', 'o', 'r', 'e'}; char[] bookstoreA = {'b', 'o', 'o', 'k', 's', 't', 'o', 'r', 'e'}; String book = new String(bookA); String store = new String(storeA); String bookstore = new String(bookstoreA); String answer = book.concat(store); System.out.println(answer.equals(bookstore)); In the text area below, type in your definition of the concat method. (In other words, type in the code that should replace the //TODO comment.) Your code cannot call any methods. public class String { private char[] data; public String(char[] value) { data = new…