Program Explanation Program: //Import the required java packages import java.util.ArrayList; import javafx.application.Application; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.control.TextField; import javafx.scene.layout.BorderPane; import javafx.scene.layout.GridPane; import javafx.scene.layout.HBox; import javafx.stage.Stage; //Declare the class Ex22_16 public class Ex22_25 extends Application { //Declare the size public static final int SIZE = 10; //Assign the field for cells private TextField[][] cells = new TextField[ SIZE ][ SIZE ]; /*Create the buttons to solve, clear and to enter the next value*/ private Button btSolve = new Button("Solve"); private Button btClear = new Button("Clear"); private Button btNext = new Button("Next"); private Label lblStatus = new Label(); //Create the array list private static ArrayList<int[][]> list = new ArrayList<>(); //Assign the current index value to 0 private int currentSolutionIndex = 0; @Override // Override the start method in the Application class public void start(Stage primaryStage) { //Assign the grid pane as 3*3 GridPane[][] panels = new GridPane[3][3]; GridPane p1 = new GridPane(); //Set the border color for grid p1.setStyle("-fx-border-color: red"); //Execute the for loop to add the panels of grid for (int i = 0; i < 3; i++) { for (int j = 0; j < 3; j++) { p1.add(panels[i][j] = new GridPane(), j, i); panels[i][j].setStyle("-fx-border- color: red"); } } //Execute the for loop to set the cells for (int i = 0; i < 9; i++) { for (int j = 0; j < 9; j++) { panels[i / 3][j / 3].add(cells[i][j] = new TextField(), j % 3, i % 3); cells[i][j].setPrefColumnCount(1); } } //Add all the buttons in the box HBox hBox = new HBox(5); hBox.getChildren().addAll(btSolve, btClear, btNext); hBox.setAlignment(Pos. CENTER ); btNext.setVisible(false); //Create the border pane BorderPane pane = new BorderPane(); pane.setCenter(p1); pane.setBottom(hBox); pane.setTop(lblStatus); BorderPane. setAlignment (lblStatus, Pos. CENTER ); // Create a scene and place it in the stage Scene scene = new Scene(pane, 240, 280); // Set the stage title primaryStage.setTitle("Exercise22_25"); // Place the scene in the stage primaryStage.setScene(scene); // Display the stage primaryStage.show(); //Set the Action event for buttons btSolve.setOnAction(e -> solve()); btClear.setOnAction(e -> { lblStatus.setText(""); btNext.setVisible(false); /*Execute the for loop until the condition fails*/ for (int i = 0; i < 9; i++) for (int j = 0; j < 9; j++) { cells[i][j].setText(""); cells[i][j].setStyle("-fx-text- fill: black"); } }); //Set the action of event for index btNext.setOnAction(e -> { currentSolutionIndex = ++currentSolutionIndex % list .size(); lblStatus.setText(currentSolutionIndex + 1 + "/" + list .size()); int[][] solutionGrid = list .get(currentSolutionIndex); /*Execute the for loop to set the text for grid*/ for (int i = 0; i < 9; i++) { for (int j = 0; j < 9; j++) { cells[i][j].setText(solutionGrid[i][j] + ""); } } }); } //Define the method solve() private void solve() { //Clear the list list .clear(); currentSolutionIndex = 0; int[][] grid = new int[9][9]; //Execute the for loop until the list of grid for (int i = 0; i < 9; i++) { for (int j = 0; j < 9; j++) { /*Check the cells whether it is trimmed according to length of text*/ if (cells[i][j].getText().trim().length() == 0) { grid[i][j] = 0; //Convert the string to integer } else { grid[i][j] = Integer. parseInt (cells[i][j].getText()); cells[i][j].setStyle("-fx-text- fill: gray"); } } } //Check whether the input of Sudoku is not valid if (!Sudoku. isValid (grid)) { lblStatus.setText("Invalid Input"); //Search the grid } else { int count = Sudoku. search (grid); //Check if count is equal to 0 if (count == 0) { lblStatus.setText("No solution"); } else { // Display the first solution int[][] solutionGrid = list .get(0); for (int i = 0; i < 9; i++) { for (int j = 0; j < 9; j++) { //Set the solutions in cells cells[i][j].setText(solutionGrid[i][j] + ""); } } } } //Check if the list size is greater than 1 if ( list .size() > 1) { //Set the visibility of button btNext.setVisible(true); lblStatus.setText("1/" + list ...

Introduction to Java Programming and Data Structures Comprehensive Version (11th Edition)

11th Edition

ISBN: 9780134700144

Author: Liang

Publisher: PEARSON

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Chapter 22 Solutions

Introduction to Java Programming and Data Structures Comprehensive Version (11th Edition)

Chapter 22.2, Problem 22.2.1CP Chapter 22.2, Problem 22.2.2CP Chapter 22.3, Problem 22.3.1CP Chapter 22.3, Problem 22.3.2CP Chapter 22.3, Problem 22.3.3CP Chapter 22.3, Problem 22.3.4CP Chapter 22.3, Problem 22.3.5CP Chapter 22.4, Problem 22.4.1CP Chapter 22.4, Problem 22.4.2CP Chapter 22.4, Problem 22.4.3CP

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