Program: This will use almost all the knowledge about GUI we covered in this cla

Question

Program:

This will use almost all the knowledge about GUI we covered in this class. Particularly, we are going to write a program that draws a Sudoku board with buttons, combobox on the side, and a text area at the bottom for output messages. The board itself is a 9 x 9 square, divided into 9 3x3 squares. Note that each smaller square is set off by a heavier border than the regular intersquare borders. Each square is a text field. So, the user is able to type an integer number (range from 0-9). On the side there are four buttons and a combobox. The four buttons allow you to solve, get a new puzzle, get a hint, or reset puzzle; the combobox lets you to choose difficulty level. We haven’t covered the combobox in details in the class. Thus, we will give a brief introduction here:

A JComboBox is a gadget that offers a set of predefined items of selection. To add items to the combobox, you can do one at a time, like:

JComboBox jCmb = new JComboBox();

jCmb.addItem(“Novel”);

Or do it in a batch mode when the object is created (three items are created), like:

String[] difficulties = { “Easy”, “Medium”, “Hard” };

JComboBox difficultyBox = new JComboBox(difficulties);

To set a default item (make the item active (displayed)), you can use the “setSelectedIndex()” method. For example, the following segment of code will make Medium to be selected:

String[] difficulties = { “Easy”, “Medium”, “Hard” };

//Create the combo box, select item at index 1.

//Indices start at 0, so 1 specifies Medium.

JComboBox difficultyBox = new JComboBox(difficulties);

difficultyBox.setSelectedIndex(1);

To get a selected item, you can use the following:

String s = (String)jCmb.getSelectedItem();

Note: you must use a cast before the assignment.

When a user selects one item from a combobox, it will generate two events:

ActionEvent (its corresponding method is actionPerformed()) and ItemEvent (its corresponding method is itemStateChanged()).

The JComboBox class has multiple constructors. Besides the one that takes one parameter, there is another one that takes no parameter.

To demonstrate the responses of our program, we use a “text area” as an output gadget. In this case, we use a titled border to single out the gadget. The caption text is “Output Area” as shown in Figure 1. The following segment of code shows how we can achieve this and use the text area to display the message “Hi, world!”.

JTextArea jtxtar = new JTextArea(30, 20);

Jtxtar.setBorder(BorderFactory.creatTitledBOrder(“Output Area”));

jtxtar.setText(“Hi, world!”);

Figure 1 shows the picture of the layout of the application:

Figure 1: the GUI sample for program 7.

Requirements

This program has a lot of things to specify. Thus, I am going to divide the requirements into two areas: the layout requirements and the general requirements.

Layout Requirements

A. To make the GUI interface look nice, we need multiple layout managers to work together. Specifically, we ask you to use the requirements specified in Figure 2 as your layout design.

Figure 2: the GUI layout requirements.

The SudokuLayout class (itself is a child of panel) is the first layer panel. Suggested dimension for this panel should be (450, 350). At the bottom of the Sudoku, there is a “text area”. This gadget has certain size. The following lines show how we can achieve this:

txtArea = new JTextArea(4, 20);

add(txtArea, BorderLayout.SOUTH);

As indicated in Figure 2, the frame embeds this panel as the first level organizer. The layout managers used by each panel should be the ones indicated by the above diagram. You should set borders for some containers as indicated in the above diagram.

Use two for loops to draw the text fields instead of brute-force of listing 81 text fields. You should do something like:

for (int k = 1; k <= 9; k++)

{

JPanel level2 = new JPanel();

….

for (int i = 1; i <= 9; i++)

{

JTextField text = new JTextField();

…

}

gridPanel.add(level2);

}

Note: the for-loops implementation saves you many lines of code but there is one shortcoming: cannot refer text field individually. Since we are focusing on the layout, the for-loop method is preferred.

For the Combobox, you should set “Hard” as its initial selected item (using program code).

2) General Requirements

A. To use two classes to implement the application: an application class named “TestSudoku” and a work class named “SudokuLayout.”

B. I do not expect you to implement every visual gadget. But I do expect you to implement some selected visual gadgets. Please implement the following visual gadgets and write listeners for them. These gadgets have the following behaviors:

Button “Reset”---when the button is clicked, the program will clear the text area, then output the string “Reset button clicked!” to the text area.

Button “Hint”---when the button is clicked, the program will clear the text area, then output the string “Hint button clicked!” to the text area.

Combobox “Difficulty”---when an item is selected, the program will clear the text area, then output the selected item name to the text area.

C. You should implement the listeners using loosely coupled methods (private listener class or private adapter class).

Notes

Don’t worry about colors. If you want to play around with colors for text, textfields, buttons, etc., go right ahead. Have fun. But don’t worry about it if you don’t want to.

The borders around the game board, around the 3x3 sections, and around each individual square, are important. You should follow the requirement to get full credits.

SCORE YOUR POINTS BY DOING THE FOLLOWING

1. Draw a class diagram in the space below (remember that private classes needn’t to be in a class diagram) (6 pts):

2. Cut and paste your Java source code in the space below (10 pts):

3. Implementation conforms to the requirements (using private class listeners or adapter class) (4 pts):

4. Do output screen captures. You will be asked to do 3 screen captures according to the following scenarios (15 pts):

Scenario 1 (4 pts): start the program afresh, click the Reset button, do a screen capture and paste it in the space below:

Scenario 2 (4 pts): start the program afresh, click the Hint button, do a screen capture and paste it in the space below:

Scenario 3 (7 pts): start the program afresh. From the combobox, select the item named “Medium”, do a screen capture and paste it in the space below:

Explanation / Answer

This is java Sudku program.you can play it. package io.vertx.blog.first.start; import java.awt.event.*; import javax.swing.*; import java.awt.*; /** * The Sudoku game. * To solve the number puzzle, each row, each column, and each of the * nine 3×3 sub-grids shall contain all of the digits from 1 to 9 */ public class DisplayPanel extends JFrame { // Name-constants for the game properties public static final int GRID_SIZE = 9; // Size of the board public static final int SUBGRID_SIZE = 3; // Size of the sub-grid // Name-constants for UI control (sizes, colors and fonts) public static final int CELL_SIZE = 60; // Cell width/height in pixels public static final int CANVAS_WIDTH = CELL_SIZE * GRID_SIZE; public static final int CANVAS_HEIGHT = CELL_SIZE * GRID_SIZE; // Board width/height in pixels public static final Color OPEN_CELL_BGCOLOR = Color.YELLOW; public static final Color OPEN_CELL_TEXT_YES = new Color(0, 255, 0); // RGB public static final Color OPEN_CELL_TEXT_NO = Color.RED; public static final Color CLOSED_CELL_BGCOLOR = new Color(240, 240, 240); // RGB public static final Color CLOSED_CELL_TEXT = Color.BLACK; public static final Font FONT_NUMBERS = new Font("Monospaced", Font.BOLD, 20); // The game board composes of 9x9 JTextFields, // each containing String "1" to "9", or empty String private JTextField[][] tfCells = new JTextField[GRID_SIZE][GRID_SIZE]; // Puzzle to be solved and the mask (which can be used to control the // difficulty level). // Hardcoded here. Extra credit for automatic puzzle generation // with various difficulty levels. private int[][] puzzle = {{5, 3, 4, 6, 7, 8, 9, 1, 2}, {6, 7, 2, 1, 9, 5, 3, 4, 8}, {1, 9, 8, 3, 4, 2, 5, 6, 7}, {8, 5, 9, 7, 6, 1, 4, 2, 3}, {4, 2, 6, 8, 5, 3, 7, 9, 1}, {7, 1, 3, 9, 2, 4, 8, 5, 6}, {9, 6, 1, 5, 3, 7, 2, 8, 4}, {2, 8, 7, 4, 1, 9, 6, 3, 5}, {3, 4, 5, 2, 8, 6, 1, 7, 9}}; // For testing, open only 2 cells. private boolean[][] masks = {{false, false, false, false, false, true, false, false, false}, {false, false, false, false, false, false, false, false, true}, {false, false, false, false, false, false, false, false, false}, {false, false, false, false, false, false, false, false, false}, {false, false, false, false, false, false, false, false, false}, {false, false, false, false, false, false, false, false, false}, {false, false, false, false, false, false, false, false, false}, {false, false, false, false, false, false, false, false, false}, {false, false, false, false, false, false, false, false, false}}; /** * Constructor to setup the game and the UI Components */ public DisplayPanel() { Container cp = getContentPane(); cp.setLayout(new GridLayout(GRID_SIZE, GRID_SIZE)); // 9x9 GridLayout // Allocate a common listener as the ActionEvent listener for all the // JTextFields InputListener listener = new InputListener(); // Construct 9x9 JTextFields and add to the content-pane for (int row = 0; row

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