In Java please: 1) Part 1: Edit the getTileList method (add length method too) Dear Developer, It seems...

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In Java please:

1) Part 1: Edit the getTileList method (add length methodtoo)

Dear Developer, It seems an overzealous programmer tried to createa Fibonacci slider puzzle from our old code. This brought up thefact there is a data integrity issue in our SlidingSquarePuzzleclass. It makes sense because the classâ€™s data only consists of anint[]. Since, you are new this is a good opportunity to get yourfeet wet. I want you to change the offending code and help shore upour security hole. Iâ€™ve attached their Driver and the GUI andSlidingSquarePuzzle files. Iâ€™ve also commented out the offendingcode. Sincerely, Your Boss P.S. You might as well include somedocumentation while youâ€™re at it. Itâ€™s been bugging me for thelongest time.

Part 1: Edit the getTileList method

1. Why does this method create a security issue? a. Because youhave direct access to the array. As seen in the driver, you havethe reference to the array.

2. Change the method to getTile(int index) and return an int atthe specific index of tileList.

3. This will break the GUI code. You will need to replaceinstances of getTileList with getTile. a. Even though you havechanged everything, your code will not work. b. This is due to thereturn data being primitive. You cannot assign data to a primitivedata type.

4. Add a length method that returns the tileList.length. a.Replace where necessary.

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Driver.java:

public class Driver {    public static void main(String[] args) {        //change this number to how many tiles you want        int numberOfTiles = 9;                SlidingSquarePuzzle fibonaciSlider = new SlidingSquarePuzzle(numberOfTiles);        //       fibonaciSlider.getTileList()[0] = 1;//       fibonaciSlider.getTileList()[1] = 1;//       fibonaciSlider.getTileList()[2] = 2;//       fibonaciSlider.getTileList()[3] = 3;//       fibonaciSlider.getTileList()[4] = 5;//       fibonaciSlider.getTileList()[5] = 8;//       fibonaciSlider.getTileList()[6] = 13;//       fibonaciSlider.getTileList()[7] = 21;                GUI.init(fibonaciSlider);    }}

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GUI.java

import java.awt.*;import java.awt.event.*;import javax.swing.*; @SuppressWarnings(\"serial\")public class GUI extends JPanel {   private SlidingSquarePuzzle ssp;  private final int sideLength;  private final int tileSize;  private int blankPos;  private final int margin;  private final int gridSize;  private boolean gameOver;   private GUI(SlidingSquarePuzzle ssp) {    this.ssp = ssp;        sideLength = (int) Math.floor(Math.sqrt(ssp.getTileList().length));    final int resolution = 640;    margin = 40;    tileSize = (resolution - 2 * margin) / sideLength;    gridSize = tileSize * sideLength;     setPreferredSize(new Dimension(resolution, resolution + margin));    setBackground(Color.WHITE);    setForeground(new Color(0x006940));     setFont(new Font(\"SansSerif\", Font.BOLD, 60));     gameOver = true;        addMouseListener(new MouseAdapter() {      @Override      public void mousePressed(MouseEvent e) {        if (gameOver) {            newGame();        } else {           int ex = e.getX() - margin;          int ey = e.getY() - margin;          if (ex < 0 || ex > gridSize || ey < 0 || ey > gridSize) return;           int clickX = ex / tileSize;          int clickY = ey / tileSize;          int blankX = blankPos % sideLength;          int blankY = blankPos / sideLength;           int clickPos = clickY * sideLength + clickX;           int direction = 0;          if (clickX == blankX && Math.abs(clickY - blankY) > 0) {            direction = (clickY - blankY) > 0 ? sideLength : -sideLength;           } else if (clickY == blankY && Math.abs(clickX - blankX) > 0) {            direction = (clickX - blankX) > 0 ? 1 : -1;          }           if (direction != 0) {            do {              int newBlankPos = blankPos + direction;              ssp.getTileList()[blankPos] = ssp.getTileList()[newBlankPos];              blankPos = newBlankPos;            } while (blankPos != clickPos);            ssp.getTileList()[blankPos] = 0;          }           gameOver = ssp.isSolved();        }        repaint();      }    });    newGame();  }    private void newGame() {    ssp.shuffle();    gameOver = false;    for (int i = 0; i < ssp.getTileList().length; i++) {        if(ssp.getTileList()[i] != 0) continue;        blankPos = i;        break;    }  }   private void drawGrid(Graphics2D g) {    for (int i = 0; i < ssp.getTileList().length; i++) {      int x = margin + (i % sideLength) * tileSize;      int y = margin + (i / sideLength) * tileSize;       if (ssp.getTileList()[i] == 0) {        if (gameOver) {          g.setColor(Color.GREEN);          drawCenteredString(g, \"\u2713\", x, y);        }        continue;      }       g.setColor(getForeground());      g.fillRoundRect(x, y, tileSize, tileSize, 25, 25);      g.setColor(Color.green.darker());      g.drawRoundRect(x, y, tileSize, tileSize, 25, 25);      g.setColor(Color.WHITE);       drawCenteredString(g, String.valueOf(ssp.getTileList()[i]), x, y);    }  }   private void drawStartMessage(Graphics2D g) {    if (gameOver) {      g.setFont(getFont().deriveFont(Font.BOLD, 18));      g.setColor(getForeground());      String s = \"click to start a new game\";      int x = (getWidth() - g.getFontMetrics().stringWidth(s)) / 2;      int y = getHeight() - margin;      g.drawString(s, x, y);    }  }   private void drawCenteredString(Graphics2D g, String s, int x, int y) {    FontMetrics fm = g.getFontMetrics();    int asc = fm.getAscent();    int des = fm.getDescent();     x = x + (tileSize - fm.stringWidth(s)) / 2;    y = y + (asc + (tileSize - (asc + des)) / 2);     g.drawString(s, x, y);  }   @Override  public void paintComponent(Graphics gg) {    super.paintComponent(gg);    Graphics2D g = (Graphics2D) gg;    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,        RenderingHints.VALUE_ANTIALIAS_ON);     drawGrid(g);    drawStartMessage(g);  }   public static void init(SlidingSquarePuzzle ssp) {    SwingUtilities.invokeLater(() -> {      JFrame f = new JFrame();      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);      f.setTitle(\"Slidng Square Puzzle\");      f.setResizable(false);      f.add(new GUI(ssp), BorderLayout.CENTER);      f.pack();      f.setLocationRelativeTo(null);      f.setVisible(true);    });  }}

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SlidingSquarePuzzle.java

import java.util.Arrays;import java.util.Random;public class SlidingSquarePuzzle {    private int [] tileList;        public SlidingSquarePuzzle() {        this(16);    }    public SlidingSquarePuzzle(int size) {        tileList = size < 4                 ? new int[4]                : new int[(int) Math.pow(Math.floor(Math.sqrt(size)), 2)];        solve();    }    public int[] getTileList() {        return tileList;    }    public void solve() {        for(int i = 0; i < tileList.length - 1; i++) {            tileList[i] = i + 1;        }    }    public boolean isSolved() {        for(int i = 0; i < tileList.length - 1; i++)            if (tileList[i] != i + 1) return false;        return true;    }    /*     * This looks at the puzzle and checks if it is solvable     */    private boolean isSolvable() {        int inversions = 0;        int m = (int) Math.floor(Math.sqrt(tileList.length));        for(int i = 0; i < tileList.length; i++)            for(int j = i + 1; j < tileList.length; j++)            {                if(tileList[i] == 0 || tileList[j] == 0) continue;        if (tileList[j] < tileList[i])          inversions++;            }        if(m % 2 == 1)            return inversions % 2 == 0;        else {            int blankIndex = 0;             for(int i = 0; i < tileList.length; i++)                if(tileList[i] == 0 ) {                    blankIndex = i;                    break;                }            if((blankIndex / m) % 2 == 0)                return inversions % 2 == 1;            else                return inversions % 2 == 0;        }    }    public void shuffle() {        Random rand = new Random();        do {            for(int i = tileList.length - 1; i > 0; i--) {                int j = rand.nextInt(i + 1);                int temp = tileList[j];                tileList[j] = tileList[i];                tileList[i] = temp;            }        }while(!this.isSolvable());    }}

Answer & Explanation Solved by verified expert

4.1 Ratings (603 Votes)

Below are the three method required in SlidingSquarePuzzlejava file Apart from given documentation I also added settile method to set the value in array public int getTileint index return tileListindex public void setTileint indexint value tileListindexvalue public int length return tileListlength Replace some code in GUIjava file 1 sspsetTileblankPos sspgetTilenewBlankPos in place of sspgetTileListblankPos sspgetTileListnewBlankPos 2 replace sspgetTileListlength to ssplength 3 replace sspgetTileListindex to sspgetTileindex Below is required editable code SlidingSquarePuzzlejava import javautilArrays import javautilRandom public class SlidingSquarePuzzle private int tileList public SlidingSquarePuzzle this16 public SlidingSquarePuzzleint size tileList size 4 new int4 new intint MathpowMathfloorMathsqrtsize 2 solve public int getTileint index return tileListindex public void setTileint indexint value tileListindexvalue public int length return tileListlength public void solve forint i 0 i See Answer

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