I created a Class that extends from JFrame which has a table of buttons. In the class constructor I added the buttons to the panel but when I run the main nothing happens and I see only an empty frame. So can you hep me to find the problem?
This is the code:
public class Tita extends JFrame {
JButton ff[][] = new JButton[3][3];
int i = 0, j = 0;
public static void main(String[] args) {
Tita oo = new Tita();
}
public Tita() {
super("Newframe");
setVisible(true);
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
ff[i][j].setText("sss");
this.getContentPane().add(ff[i][i]);
}
}
}
What is happening is that you haven't initialized any JButton, also, when you add the button you have getContentPane().add(ff[i][i]);, when it should be getContentPane().add(ff[i][j]);
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Tita extends JFrame {
JButton ff[][] = new JButton[3][3];
int i = 0, j = 0;
public static void main(String[] args) {
Tita oo = new Tita();
}
public Tita() {
super("Newframe");
setVisible(true);
setLocationRelativeTo(null);
setSize(new Dimension(300, 400));
setLayout(new GridLayout(3, 0));
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
ff[i][j] = new JButton("SSS");
ff[i][j].setSize(30, 10);
getContentPane().add(ff[i][j],i);
}
}
}
}
Related
I am trying to make a method that disables JButtons.
The JButtons are in an array in the form of a grid, JButton [int][int] and the integers are supposed to be coordinates.
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.*;
public class BS {
public static JFrame f = new JFrame("BS");
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
initializeGui();
}
});
}
static void initializeGui() {
JPanel gui = new JPanel(new BorderLayout(3,1));
//This is the array of the JButtons in the form of a grid
final JButton[][] coordinates = new JButton[15][15];
JPanel field;
// set up the main GUI
gui.setBorder(new EmptyBorder(5, 5, 5, 5));
field = new JPanel(new GridLayout(0, 15));
field.setBorder(new CompoundBorder(new EmptyBorder(15,15,15,15),new LineBorder(Color.BLACK)));
JPanel boardConstrain = new JPanel(new GridBagLayout());
boardConstrain.add(field);
gui.add(boardConstrain);
//The making of the grid
for (int ii = 0; ii < coordinates.length; ii++) {
for (int jj = 0; jj < coordinates[ii].length; jj++) {
JButton b = new JButton();
ImageIcon icon = new ImageIcon(
new BufferedImage(30, 30, BufferedImage.TYPE_INT_ARGB));
b.setIcon(icon);
coordinates[jj][ii] = b;
field.add(coordinates[jj][ii]);
}
}
f.add(gui);
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.pack();
f.setMinimumSize(f.getSize());
f.setVisible(true);
}
}
I did some changes in your code:
public static JFrame f = new JFrame("BS"); JFrame shouldn't be static and should have a more meaningful name (like frame for example).
final JButton[][] coordinates = new JButton[15][15]; moved this array as a class member and made it non final and also changed the name to buttons as it's easier to know what it is (coordinates to me, sounds more like an array of Point or int)
After that I added an ActionListener, see How to use Actions tutorial.
private ActionListener listener = e -> {
//Loops through the whole array in both dimensions
for (int i = 0; i < buttons.length; i++) {
for (int j = 0; j < buttons[i].length; j++) {
if (e.getSource().equals(buttons[i][j])) { //Find the JButton that was clicked
if (isStartButton) { //startButton is a boolean variable that tells us if this is the first button clicked or not
startXCoord = i;
startYCoord = j;
} else {
endXCoord = i;
endYCoord = j;
disableButtons(); //Only when we have clicked twice we disable all the buttons in between
}
isStartButton = !isStartButton; //In every button click we change the value of this variable
break; //No need to keep looking if we found our clicked button. Add another one with a condition to skip the outer loop.
}
}
}
};
And a method called disableButtons() which disables all the buttons between the 2 clicked buttons:
private void disableButtons() {
compareCoords(); //This method checks if first button clicked is after 2nd one.
for (int i = startXCoord; i <= endXCoord; i++) {
for (int j = startYCoord; j <= endYCoord; j++) {
buttons[i][j].setEnabled(false); //We disable all buttons in between
}
}
}
At the end our code ends like this:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
public class DisableButtonsInBetween {
private JFrame frame = new JFrame(getClass().getSimpleName());
private JButton[][] buttons;
private int startXCoord = -1;
private int startYCoord = -1;
private int endXCoord = -1;
private int endYCoord = -1;
private boolean isStartButton = true;
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DisableButtonsInBetween().initializeGui();
}
});
}
void initializeGui() {
JPanel gui = new JPanel(new BorderLayout(3, 1));
// This is the array of the JButtons in the form of a grid
JPanel pane;
buttons = new JButton[15][15];
// set up the main GUI
gui.setBorder(new EmptyBorder(5, 5, 5, 5));
pane = new JPanel(new GridLayout(0, 15));
pane.setBorder(new CompoundBorder(new EmptyBorder(15, 15, 15, 15), new LineBorder(Color.BLACK)));
JPanel boardConstrain = new JPanel(new GridBagLayout());
boardConstrain.add(pane);
gui.add(boardConstrain);
// The making of the grid
for (int ii = 0; ii < buttons.length; ii++) {
for (int jj = 0; jj < buttons[ii].length; jj++) {
buttons[jj][ii] = new JButton();
ImageIcon icon = new ImageIcon(new BufferedImage(30, 30, BufferedImage.TYPE_INT_ARGB));
buttons[jj][ii].setIcon(icon);
buttons[jj][ii].addActionListener(listener);
pane.add(buttons[jj][ii]);
}
}
frame.add(gui);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setMinimumSize(frame.getSize());
frame.setVisible(true);
}
//The ActionListener is what gets called when you click a JButton
private ActionListener listener = e -> {
//These for loops are done to identify which button was clicked.
for (int i = 0; i < buttons.length; i++) {
for (int j = 0; j < buttons[i].length; j++) {
if (e.getSource().equals(buttons[i][j])) {
if (isStartButton) {
//We save the coords of the 1st button clicked
startXCoord = i;
startYCoord = j;
} else {
//We save the coords of the 2nd button clicked and call the disableButtons method
endXCoord = i;
endYCoord = j;
disableButtons();
}
isStartButton = !isStartButton;
break;
}
}
}
};
//This method disables all the buttons between the 2 that were clicked
private void disableButtons() {
compareCoords();
for (int i = startXCoord; i <= endXCoord; i++) {
for (int j = startYCoord; j <= endYCoord; j++) {
buttons[i][j].setEnabled(false);
}
}
}
//This method compares the coords if the 2nd button was before (in its coords) than the 1st one it switched their coords
private void compareCoords() {
if (endXCoord < startXCoord) {
int aux = startXCoord;
startXCoord = endXCoord;
endXCoord = aux;
}
if (endYCoord < startYCoord) {
int aux = startYCoord;
startYCoord = endYCoord;
endYCoord = aux;
}
}
}
I hope this is what you were trying to do... if not please clarify.
I do not have the arrow operator, " -> ". I think it requires a higher Java. Is there a way to replace this?
For Java 7 and lower use this for the ActionListener:
private ActionListener listener = new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < buttons.length; i++) {
for (int j = 0; j < buttons[i].length; j++) {
if (e.getSource().equals(buttons[i][j])) {
if (isStartButton) {
startXCoord = i;
startYCoord = j;
} else {
endXCoord = i;
endYCoord = j;
disableButtons();
}
isStartButton = !isStartButton;
break;
}
}
}
}
};
I am making a chess game for a class I have and the chess piece is not displaying correctly.
This is my code:
package SucksLego;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import SucksLego.CheesBoard.CaseEchiquier;
import lejos.nxt.ColorSensor.Color;
public class ChessBoard2 extends JFrame{
private Container contents;
private JButton [][] squares = new JButton [8][8];
private int row = 7;
private int col = 1;
private ImageIcon piece = new ImageIcon ("chess-pawn-f.png");
public ChessBoard2 (){
super("Board");
contents = getContentPane();
contents.setLayout(new GridLayout (8,8));
ButtonHandler buttonHandler = new ButtonHandler();
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 8; j++) {
squares[i][j] = new JButton();
if((i+j) % 2 != 0){
squares[i][j].setBackground(getBackground().BLACK);
}
contents.add(squares [i][j]);
squares[i][j].addActionListener(buttonHandler);
}
}
squares [row][col].setIcon (piece);
setSize(500,500);
setResizable(false);
setLocationRelativeTo(null);
setVisible(true);
}
private boolean isValidMove(int i, int j){
System.out.println("I: " + i + " J: " + j);
return true;
}
private void processClick (int i, int j){
if(isValidMove(i,j) == false){
return;
}
squares[row][col].setIcon(null);
squares[i][j].setIcon(piece);
row=i;
col=j;
}
private class ButtonHandler implements ActionListener{
#Override
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 8; j++) {
if(source == squares[i][j]){
processClick(i,j);
return;
}
}
}
}
}
public static void main(String[] args) {
ChessBoard2 chess = new ChessBoard2();
}
}
The dimension of the icon is 60 x 60.
The icon is being displayed as a very small stip:
You are not getting the image, change your code and add below code to your ChessBoard2() constructor under super("Board");
try{
URL resource = ChessBoard2.class.getClassLoader().getResource("chess-pawn-f.png");
img = ImageIO.read(resource);
piece = new ImageIcon(img);
}
catch (IOException e)
{
e.printStackTrace();
}
So basically I keep getting errors within a few lines of code, yes I'm missing an if clause on line 31 I've tried both with and without it and it still doesn't work, can someone give me a hand on figuring out what I've managed to mess up on?
MAIN CLASS:
package simpleboardgame;
public class RealTile {
public static void main(String[] args) {
Tile newTile = new Tile();
}
}
PACKAGE:
package simpleboardgame;
import java.awt.*;
import javax.swing.*;
import java.util.Random;
public class Tile extends JFrame{
int rowMax = 10;
int columnMax = 10;
int row;
int col;
int n = 0;
public Tile ()
{
JFrame frame = new JFrame();
frame.setLayout(new GridLayout(rowMax, columnMax));
frame.setSize(600,600);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel nextLabel = new JLabel();
int[] activeCell = new int[100];
for (int row = 0; row < rowMax; row++)
{
for (int col = 0; col < columnMax; col++);
{
{
nextLabel.setBorder(BorderFactory.createLineBorder(//Color.BLUE ));
nextLabel.setBackground(http://Color.black );
nextLabel.setOpaque(true);
}
else
{
nextLabel = new JLabel();
}
frame.getContentPane().add(nextLabel);
}
}
}
}
The code is working fine.When i left click it does everything the code discribes.The only problem is that i don't want to click an the same spot!I can't find a solution to that.Any suggestions?
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
innerCells[i][j] = new JPanel();
innerCells[i][j].setLayout(new BorderLayout());
innerCells[i][j].setBorder(BorderFactory.createLineBorder(lineColor));
innerCells[i][j].setBackground(backgroundColor);
innerCells[i][j].addMouseListener(new MouseListener() {
#Override
public void mouseClicked(MouseEvent e) {
JPanel k = (JPanel) e.getSource();
JLabel l = new JLabel("", JLabel.CENTER);
int x = getRows();
int y = getCols();
for (int r = 0; r < getRows(); r++) {
for (int c = 0; c < getCols(); c++) {
if (innerCells[r][c] == k) {
x = r;
y = c;
}
}
}
if (array[x][y] == 0) {
l.setBackground(k.getBackground());
k.add(l);
k.setBackground(Color.white);
k.revalidate();
} else {
l.setBackground(k.getBackground());
k.add(l);
k.setBackground(Color.red);
k.revalidate();
}
randomHits();
}
If the panels never need to respond to another mouse click, simply dereigster the associated mouse listener...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class NoMoreClicks {
public static void main(String[] args) {
new NoMoreClicks();
}
public NoMoreClicks() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
add(new JLabel("Single Clicked Pane..."));
addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
e.getComponent().removeMouseListener(this);
JOptionPane.showMessageDialog(e.getComponent(), "Was Clicked");
}
});
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
Guys thanks for help by i manage to find the solution myself!I had to add only one line of code,i mean only one checking!The solution is
if (k.getComponents().length == 0)
that means if its clicked its not 0.Thank you all for trying!
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
innerCells[i][j] = new JPanel();
innerCells[i][j].setLayout(new BorderLayout());
innerCells[i][j].setBorder(BorderFactory.createLineBorder(lineColor));
innerCells[i][j].setBackground(backgroundColor);
innerCells[i][j].addMouseListener(new MouseListener() {
#Override
public void mouseClicked(MouseEvent e) {
JPanel k = (JPanel) e.getSource();
JLabel l = new JLabel("", JLabel.CENTER);
int x = getRows();
int y = getCols();
for (int r = 0; r < getRows(); r++) {
for (int c = 0; c < getCols(); c++) {
if (innerCells[r][c] == k) {
x = r;
y = c;
}
}
}
if (k.getComponents().length == 0) {
if (array[x][y] == 0) {
l.setBackground(k.getBackground());
k.add(l);
k.setBackground(Color.white);
k.revalidate();
} else {
l.setBackground(k.getBackground());
k.add(l);
k.setBackground(Color.red);
playerhit++;
GameScreen.FinalWinner();
k.revalidate();
}
randomHits();
}
}
I used the code from Hovercraft Full Of Eels and manipulated it a little to get the numbering as I wanted. It looks good now and I can read the status but I can't figure out how to manipulate the individual checkboxes with my buttons on the form. Can someone help?
package and.lotto;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.*;
#SuppressWarnings("serial")
public class NewLotto extends JPanel {
public static final int GRID_PANEL_ROWS = 3;
public static final int GRID_PANEL_COLS = 4;
public static final int PANELS = 12;
public static final int BOXES = 12;
private static final int GAP = 1;
private CheckBoxGrid[] checkBoxGrid = new CheckBoxGrid[PANELS];
public NewLotto() {
setLayout(new GridLayout(GRID_PANEL_ROWS, GRID_PANEL_COLS, GAP, GAP));
for (int rows = 0; rows < BOXES; rows++) {
checkBoxGrid[rows] = new CheckBoxGrid(rows,0);
add(checkBoxGrid[rows]);
}
}
private static void createAndShowGui() {
NewLotto mainPanel = new NewLotto();
ButtonPanel buttons = new ButtonPanel();
JFrame frame = new JFrame("Lotto");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(buttons,BorderLayout.NORTH);
frame.add(mainPanel, BorderLayout.SOUTH);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
#SuppressWarnings("serial")
class ButtonPanel extends JPanel {
JButton generate;
JButton clear;
private ActionListener actionListener = new MyButtonListener();
public ButtonPanel(){
generate = new JButton("Generate numbers");
generate.addActionListener(actionListener);
clear = new JButton("Clear All");
clear.addActionListener(actionListener);
add(generate);
add(clear);
}
private class MyButtonListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("Testing");
}
}
}
#SuppressWarnings("serial")
class CheckBoxGrid extends JPanel {
private static final int CHECK_BOXES = 35;
private static final int CHECK_BOX_COLS = 6;
private static final int CHECK_BOX_ROWS = 6;
private static final int GAP = -5;
private JCheckBox[] checkBoxes = new JCheckBox[CHECK_BOXES];
private int gridIndex;
private ItemListener itemListener = new MyCheckBoxListener();
private int row;
private int col;
public CheckBoxGrid(int row, int col) {
this.row = row;
this.col = col;
gridIndex = row + col + 1;
setBorder(BorderFactory.createTitledBorder(String.valueOf(gridIndex)));
setLayout(new GridLayout(CHECK_BOX_ROWS, CHECK_BOX_COLS, GAP, GAP));
for (int cbRow = 0; cbRow < checkBoxes.length; cbRow++) {
JCheckBox checkBox = new JCheckBox();
checkBox.addItemListener(itemListener);
add(checkBox);
checkBox.setRolloverEnabled(false);
checkBox.setRequestFocusEnabled(false);
checkBoxes[cbRow] = checkBox;
}
checkBoxes[0].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red01.png")));
checkBoxes[0].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red01sel.png")));
checkBoxes[1].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red02.png")));
checkBoxes[1].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red02sel.png")));
checkBoxes[2].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red03.png")));
checkBoxes[2].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red03sel.png")));
checkBoxes[3].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red04.png")));
checkBoxes[3].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red04sel.png")));
checkBoxes[4].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red05.png")));
checkBoxes[4].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red05sel.png")));
checkBoxes[5].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red06.png")));
checkBoxes[5].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red06sel.png")));
checkBoxes[6].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red07.png")));
checkBoxes[6].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red07sel.png")));
checkBoxes[7].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red08.png")));
checkBoxes[7].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red08sel.png")));
checkBoxes[8].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red09.png")));
checkBoxes[8].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red09sel.png")));
checkBoxes[9].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red10.png")));
checkBoxes[9].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red10sel.png")));
checkBoxes[10].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red11.png")));
checkBoxes[10].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red11sel.png")));
checkBoxes[11].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red12.png")));
checkBoxes[11].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red12sel.png")));
checkBoxes[12].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red13.png")));
checkBoxes[12].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red13sel.png")));
checkBoxes[13].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red14.png")));
checkBoxes[13].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red14sel.png")));
checkBoxes[14].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red15.png")));
checkBoxes[14].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red15sel.png")));
checkBoxes[15].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red16.png")));
checkBoxes[15].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red16sel.png")));
checkBoxes[16].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red17.png")));
checkBoxes[16].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red17sel.png")));
checkBoxes[17].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red18.png")));
checkBoxes[17].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red18sel.png")));
checkBoxes[18].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red19.png")));
checkBoxes[18].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red19sel.png")));
checkBoxes[19].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red20.png")));
checkBoxes[19].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red20sel.png")));
checkBoxes[20].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red21.png")));
checkBoxes[20].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red21sel.png")));
checkBoxes[21].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red22.png")));
checkBoxes[21].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red22sel.png")));
checkBoxes[22].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red23.png")));
checkBoxes[22].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red23sel.png")));
checkBoxes[23].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red24.png")));
checkBoxes[23].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red24sel.png")));
checkBoxes[24].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red25.png")));
checkBoxes[24].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red25sel.png")));
checkBoxes[25].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red26.png")));
checkBoxes[25].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red26sel.png")));
checkBoxes[26].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red27.png")));
checkBoxes[26].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red27sel.png")));
checkBoxes[27].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red28.png")));
checkBoxes[27].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red28sel.png")));
checkBoxes[28].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red29.png")));
checkBoxes[28].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red29sel.png")));
checkBoxes[29].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red30.png")));
checkBoxes[29].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red30sel.png")));
checkBoxes[30].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red31.png")));
checkBoxes[30].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red31sel.png")));
checkBoxes[31].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red32.png")));
checkBoxes[31].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red32sel.png")));
checkBoxes[32].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red33.png")));
checkBoxes[32].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red33sel.png")));
checkBoxes[33].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red34.png")));
checkBoxes[33].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red34sel.png")));
checkBoxes[34].setIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red35.png")));
checkBoxes[34].setSelectedIcon(new ImageIcon(NewLotto.class.getResource("/and/lotto/img/red35sel.png")));
}
private class MyCheckBoxListener implements ItemListener {
#Override
public void itemStateChanged(ItemEvent itemEvt) {
JCheckBox source = (JCheckBox) itemEvt.getSource();
boolean selected = source.isSelected();
int cbRow = -1;
for (int r = 0; r < checkBoxes.length; r++) {
if (source.equals(checkBoxes[r])) {
cbRow = r;
}
}
String text = String.format("Grid %d, selected: %b, at %d",
(row + col + 1), selected, cbRow);
System.out.println(text);
}
}
}
Here is the original question:
I am trying to create a layout with an array of 12 JPanels each containing an array of 35 JCheckboxes. The problem I am having is that although the panels and checkboxes all display fine on the form, I have no way of accessing the properties of the individual checkboxes.
Here is part of the code I use:
JPanel panel_south = new JPanel();
contentPane.add(panel_south, BorderLayout.SOUTH);
panel_south.setLayout(new GridLayout(3, 4, 1, 1));
for(Integer i =0; i<12;i++){
Integer title = i+1;
EtchedBorder border = new EtchedBorder(EtchedBorder.LOWERED, null, null);
TitledBorder titled = new TitledBorder(border,title.toString());
row[i] = new JPanel();
row[i].setBorder(titled);
row[i].setLayout(new GridLayout(6, 6, -6, -5));
panel_south.add(row[i]);
JCheckBox[] rad = new JCheckBox[35];
for (int j = 0;j<35;j++){
rad[j] = new JCheckBox();
row[i].add(rad[j]);
}
When I try to use a line like this in the for loop:
row[i].rad[j].setSelected(true);
I get the error: rad cannot be resolved
What am I doing wrong here?
You should refactor out the JPanel that holds a grid of JTextFields, create a separate class for this, one that accepts a number for it's index, and that holds the JCheckBox grid or a JTable.
e.g.,
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.*;
#SuppressWarnings("serial")
public class CheckBoxGridMain extends JPanel {
public static final int GRID_PANEL_ROWS = 3;
public static final int GRID_PANEL_COLS = 4;
private static final int GAP = 1;
private CheckBoxGrid[][] checkBoxGrid = new CheckBoxGrid[GRID_PANEL_ROWS][GRID_PANEL_COLS];
public CheckBoxGridMain() {
setLayout(new GridLayout(GRID_PANEL_ROWS, GRID_PANEL_COLS, GAP, GAP));
for (int row = 0; row < checkBoxGrid.length; row++) {
for (int col = 0; col < checkBoxGrid[row].length; col++) {
checkBoxGrid[row][col] = new CheckBoxGrid(row, col);
add(checkBoxGrid[row][col]);
}
}
}
private static void createAndShowGui() {
CheckBoxGridMain mainPanel = new CheckBoxGridMain();
JFrame frame = new JFrame("CheckBox Grid");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
#SuppressWarnings("serial")
class CheckBoxGrid extends JPanel {
private static final int CHECK_BOX_ROWS = 6;
private static final int CHECK_BOX_COLS = 6;
private static final int GAP = -5;
private JCheckBox[][] checkBoxes = new JCheckBox[CHECK_BOX_ROWS][CHECK_BOX_COLS];
private int gridIndex;
private ItemListener itemListener = new MyCheckBoxListener();
private int row;
private int col;
public CheckBoxGrid(int row, int col) {
this.row = row;
this.col = col;
gridIndex = row + col + 1;
setBorder(BorderFactory.createTitledBorder(String.valueOf(gridIndex)));
setLayout(new GridLayout(CHECK_BOX_ROWS, CHECK_BOX_COLS, GAP, GAP));
for (int cbRow = 0; cbRow < checkBoxes.length; cbRow++) {
for (int cbCol = 0; cbCol < checkBoxes[cbRow].length; cbCol++) {
JCheckBox checkBox = new JCheckBox();
checkBox.addItemListener(itemListener);
add(checkBox);
checkBoxes[cbRow][cbCol] = checkBox;
}
}
}
private class MyCheckBoxListener implements ItemListener {
#Override
public void itemStateChanged(ItemEvent itemEvt) {
JCheckBox source = (JCheckBox) itemEvt.getSource();
boolean selected = source.isSelected();
int cbRow = -1;
int cbCol = -1;
for (int r = 0; r < checkBoxes.length; r++) {
for (int c = 0; c < checkBoxes[r].length; c++) {
if (source.equals(checkBoxes[r][c])) {
cbRow = r;
cbCol = c;
}
}
}
String text = String.format("Grid %d, selected: %b, at [%d, %d]",
(row + col + 1), selected, cbCol, cbRow); // corrected row/col order
System.out.println(text);
}
}
}
Which displays