Question

Java Programming Assignment (JavaFX required).

1. You will modify the SudokuCheckApplication program that is listed below. Start with the bolded comment section in the code below.
2. Create a class that will take string input and process it as a multidimensional array
3. You will modify the program to use a multi-dimensional array to check the input text.

SudokuCheckApplication.java

import javafx.application.*;
import javafx.event.*;
import javafx.geometry.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.*;

public class SudokuCheckApplication extends Application {

   public void start(Stage primaryStage) {
   
      // Create addressable controls
      // Reachable from the event handlers
      TextArea taInput = new TextArea("Input your Sudoku answer here:");
      TextArea taOutput = new TextArea("The results will display here:");
      
      // Create the GridPane pane
      GridPane pane = new GridPane();
      pane.setPadding(new Insets(10, 10, 10, 10));
      pane.setVgap(5);
      
      // Place nodes in the GridPane pane
      pane.add(new Label("Input Sudoku:"), 0, 0);
      pane.add(taInput, 0, 1);

      // Create FlowPane pane
      FlowPane btnPane = new FlowPane();
      btnPane.setAlignment(Pos.CENTER);
      pane.setHgap(5);

      // Place nodes in the FlowPane pane and place
      // pane in the GridPane pane
      btnPane.setPadding(new Insets(10, 10, 10, 10));
      btnPane.setHgap(10);
      
      // Create buttons and event handlers
      // Check Button
      Button btnCheck = new Button("Check");
      btnCheck.setOnAction(new EventHandler() {
         public void handle(ActionEvent e) {
            // take the text from taInput.getText() and use a multidimentional array to process the data
            
            // Output the result to taOutput.setText("the output string here");
            }
      });
      
      // Clear Button
      Button btnClear = new Button("Clear");
      btnClear.setOnAction(new EventHandler() {
         public void handle(ActionEvent e) {
            taInput.setText("");
            taOutput.setText("");
         }
      });
     
      
      // Place Buttons on the FlowPane and place FlowPane on GridPane
      btnPane.getChildren().addAll(btnCheck, btnClear);
      pane.add(btnPane, 0, 2);
                                                                                                                            
      // Place nodes in the GridPane pane
      pane.add(new Label("Check result:"), 0, 3);
      pane.add(taOutput, 0, 4);
      
      //Create scene and place it on the stage
      Scene scene = new Scene(pane);
      primaryStage.setTitle("CPT 237 Sudoku Checker");
      primaryStage.setScene(scene);
      primaryStage.show();
      
   }

   /**
   * The main method is only needed for the IDE with limited
   * JavaFX support. Not needed for running from the command line.
   */
   public static void main(String[] args) { 
    launch(args);
   }

}        

Answer 1

as far as I understand the problem: Processing the input string using multidimension array makes me understand that we need to check the input and store it in 2D array of 9*9 size and checking the proper sudoku solution or not.

NOTE: let me know if i get this wrong.

JAVA code:

//taInput.java

//testing the code

import java.util.Scanner;

public class taInput {
   public static String getText(){
       Scanner s = new Scanner(System.in);
       return s.nextLine();
   }
}

//taOuput.java

//testing the code
public class taOutput {
   public static void setText(String s){
       System.out.println(s);
   }
}

SudokuCheckApplication.java

import javafx.application.*;
import javafx.event.*;
import javafx.geometry.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.*;

public class SudokuCheckApplication extends Application {

   public void start(Stage primaryStage) {
   
      // Create addressable controls
      // Reachable from the event handlers
      TextArea taInput = new TextArea("Input your Sudoku answer here:");
      TextArea taOutput = new TextArea("The results will display here:");
      
      // Create the GridPane pane
      GridPane pane = new GridPane();
      pane.setPadding(new Insets(10, 10, 10, 10));
      pane.setVgap(5);
      
      // Place nodes in the GridPane pane
      pane.add(new Label("Input Sudoku:"), 0, 0);
      pane.add(taInput, 0, 1);

      // Create FlowPane pane
      FlowPane btnPane = new FlowPane();
      btnPane.setAlignment(Pos.CENTER);
      pane.setHgap(5);

      // Place nodes in the FlowPane pane and place
      // pane in the GridPane pane
      btnPane.setPadding(new Insets(10, 10, 10, 10));
      btnPane.setHgap(10);
      
      // Create buttons and event handlers
      // Check Button
      Button btnCheck = new Button("Check");
      btnCheck.setOnAction(new EventHandler() {
         public void handle(ActionEvent e) {
            // take the text from taInput.getText() and use a multidimentional array to process the data
            String arr[] = input.split(" ");
        System.out.println(input+" "+arr.length);
        int n = arr.length;
        
        if(n!=81) System.out.println("Not 81.");
        
        int grid[][] = new int[9][9];
        
        for(int i=0;i<9;i++){
            for(int j=0;j<9;j++){
                grid[i][j] = Integer.parseInt(arr[(i*9)+j]);
            }
        }
        
        check(grid);
        
        taOutput.setText(input);
            // Output the result to taOutput.setText("the output string here");
            }
      });
      
      // Clear Button
      Button btnClear = new Button("Clear");
      btnClear.setOnAction(new EventHandler() {
         public void handle(ActionEvent e) {
            taInput.setText("");
            taOutput.setText("");
         }
      });
     
      
      // Place Buttons on the FlowPane and place FlowPane on GridPane
      btnPane.getChildren().addAll(btnCheck, btnClear);
      pane.add(btnPane, 0, 2);
                                                                                                                            
      // Place nodes in the GridPane pane
      pane.add(new Label("Check result:"), 0, 3);
      pane.add(taOutput, 0, 4);
      
      //Create scene and place it on the stage
      Scene scene = new Scene(pane);
      primaryStage.setTitle("CPT 237 Sudoku Checker");
      primaryStage.setScene(scene);
      primaryStage.show();
      
   }

   /**
   * The main method is only needed for the IDE with limited
   * JavaFX support. Not needed for running from the command line.
   */
   public static void main(String[] args) { 
    launch(args);
   }

   private static void check(int[][] grid) {
        HashSet<Integer> set = new HashSet<>();
        
        //row-wise
        for(int i=0;i<9;i++){
            set.clear();
            for(int j=0;j<9;j++){
                if(set.contains(grid[i][j])){
                    System.out.println("Not correct.");
                    return;
                }
                set.add(grid[i][j]);
            }
        }
        
        //column-wise
        for(int i=0;i<9;i++){
            set.clear();
            for(int j=0;j<9;j++){
                if(set.contains(grid[j][i])){
                    System.out.println("Not correct.");
                    return;
                }
                set.add(grid[j][i]);
            }
        }
        
        //box-wise
        for(int i=0;i<3;i++){
            for(int j=0;j<3;j++){
                int row = (i*3);
                int col = (j*3);
                
                set.clear();
                
                for(;row<(i*3)+3;row++){
                    for(;col<(j*3)+3;col++){
                        if(set.contains(grid[j][i])){
                            System.out.println("Not correct.");
                            return;
                        }
                        set.add(grid[j][i]);
                    }
                }
            }
        }
        
        System.out.println("Correct.");
    }


}