问题
I'm trying to make my program display (testing in console first) the count number at each step where the cell changes its form. So the count should start from 0 and increment each time the cell changes its form. I tried this, using count++ however it doesn't increment by 1 but instead gives me random numbers. Any help will be much appreciated.
import java.awt.Color;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.Image;
import java.awt.Graphics;
import javax.swing.SwingUtilities;
public class GameOfLife extends javax.swing.JFrame {
final int wid = 100, hei = 50;
public static int count;
boolean[][] currentMove = new boolean[hei][wid], nextMove = new boolean[hei][wid];
boolean play;
Image offScrImg;
Graphics offScrGraph;
public GameOfLife() {
initComponents();
offScrImg = createImage(jPanel1.getWidth(), jPanel1.getHeight());
offScrGraph = offScrImg.getGraphics();
Timer time = new Timer();
TimerTask task = new TimerTask(){
public void run(){
if(play){
System.out.println(count);
for(int i = 0; i < hei; i++){
for(int j = 0; j < wid; j++){
nextMove[i][j] = decide(i,j);
}
}
for(int i = 0; i < hei; i++){
for(int j = 0; j < wid; j++){
currentMove[i][j] = nextMove[i][j];
}
}
repain();
}
}
};
time.scheduleAtFixedRate(task, 0, 100);
repain();
}
private boolean decide(int i, int j){
int neighbors = 0;
// top-left row-1,col-1
if (currentMove[getTopRow(i - 1)][getLeftCol(j - 1)]) neighbors++; //Uses getTopRow and getLeftCol methods to determine the indices of the top left cell
// left row,col-1
if (currentMove[i][getLeftCol(j - 1)]) neighbors++;
// bottom left row+1,col-1
if (currentMove[getBottomRow(i + 1)][getLeftCol(j - 1)] ) neighbors++;
// bottom row+1,col
if (currentMove[getBottomRow(i + 1)][j]) neighbors++;
// bottom right row+1,col+1
if (currentMove[getBottomRow(i + 1)][getRightCol(j + 1)]) neighbors++;
// right row,col+1
if (currentMove[i][getRightCol(j + 1)]) neighbors++;
// top-right row-1,col+1
if (currentMove[getTopRow(i - 1)][getRightCol(j + 1)])neighbors++;
// top row-1, col
if(currentMove[getTopRow(i - 1)][j]) neighbors++;
if(neighbors == 3) {
count++;
return true;
}
if(currentMove[i][j] && neighbors == 2){
count++;
return true;
}
return false;
}
private int getLeftCol(int neighbourCol) {
return neighbourCol < 0 ? (wid-1) : neighbourCol; //If the index of leftCol is less than 0, it uses the right most col (columns - 1)
}
private int getRightCol(int neighbourCol) {
return neighbourCol > (wid-1) ? 0 : neighbourCol;
}
private int getTopRow(int neighbourRow) {
return neighbourRow < 0 ? (hei - 1) : neighbourRow; //If the index of topRow is less than 0, it uses the bottom last row (rows - 1)
}
private int getBottomRow(int neighbourRow) {
return neighbourRow > (hei - 1) ? 0 : neighbourRow;
}
private void repain(){
offScrGraph.setColor(Color.RED);
offScrGraph.fillRect(0, 0, jPanel1.getWidth(), jPanel1.getHeight());
for(int i = 0 ; i < hei ; i++){
for(int j = 0 ; j < wid; j++){
if(currentMove[i][j]){
offScrGraph.setColor(Color.GREEN);
int x = j * jPanel1.getWidth()/wid;
int y = i * jPanel1.getHeight()/hei;
offScrGraph.fillRect(x, y, jPanel1.getWidth()/wid, jPanel1.getHeight()/hei);
}
}
}
offScrGraph.setColor(Color.BLACK);
for(int i = 1; i < hei;i++){
int y = i * jPanel1.getHeight()/hei;
offScrGraph.drawLine(0, y, jPanel1.getWidth(), y);
}
for(int j = 1; j < wid;j++){
int x = j * jPanel1.getWidth()/wid;
offScrGraph.drawLine(x, 0, x, jPanel1.getHeight());
}
jPanel1.getGraphics().drawImage(offScrImg, 0, 0, jPanel1);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBackground(new java.awt.Color(102, 102, 102));
jPanel1.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
public void mouseDragged(java.awt.event.MouseEvent evt) {
jPanel1MouseDragged(evt);
}
});
jPanel1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jPanel1MouseClicked(evt);
}
});
jPanel1.addComponentListener(new java.awt.event.ComponentAdapter() {
public void componentResized(java.awt.event.ComponentEvent evt) {
jPanel1ComponentResized(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 293, Short.MAX_VALUE)
);
jButton1.setText("Play");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Reset");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 323, Short.MAX_VALUE)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2))
.addContainerGap())
);
pack();
}// </editor-fold>//GEN-END:initComponents
private void jPanel1MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jPanel1MouseClicked
}//GEN-LAST:event_jPanel1MouseClicked
private void jPanel1ComponentResized(java.awt.event.ComponentEvent evt) {//GEN-FIRST:event_jPanel1ComponentResized
offScrImg = createImage(jPanel1.getWidth(), jPanel1.getHeight());
offScrGraph = offScrImg.getGraphics();
repain();
}//GEN-LAST:event_jPanel1ComponentResized
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
play = !play;
if(play) jButton1.setText("Pause");
else jButton1.setText("Play");
repain();
}//GEN-LAST:event_jButton1ActionPerformed
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
currentMove = new boolean[hei][wid];
repain();
}//GEN-LAST:event_jButton2ActionPerformed
private void jPanel1MouseDragged(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jPanel1MouseDragged
int j = wid * evt.getX() / jPanel1.getWidth();
int i = hei * evt.getY() / jPanel1.getHeight();
if(SwingUtilities.isLeftMouseButton(evt)){
currentMove[i][j] = true;
}else currentMove[i][j] = false;
repain();
}//GEN-LAST:event_jPanel1MouseDragged
public static void main(String args[]) {
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(GameOfLife.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(GameOfLife.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(GameOfLife.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(GameOfLife.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new GameOfLife().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
// End of variables declaration//GEN-END:variables
}
回答1:
This is how it can be done using a related code example.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
public class GameOfLife extends JPanel {
private int row, col;
private boolean isLiving;
private static int generation = 0;
public static Random random = new Random();
public GameOfLife(int r, int c) {
this.row = r;
this.col = c;
MouseListener listener = new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
isLiving = !isLiving;
repaint();
}
};
this.addMouseListener(listener);
isLiving = random.nextBoolean();
}
public boolean isAlive(int neighbors) {
boolean alive = false;
if (this.isLiving) {
if (neighbors < 2) {
alive = false;
} else if (neighbors == 2 || neighbors == 3) {
alive = true;
} else if (neighbors > 3) {
alive = false;
}
} else {
if (neighbors == 3) {
alive = true;
}
}
return alive;
}
public void setAlive(boolean alive) {
isLiving = alive;
}
public boolean isLiving() {
return this.isLiving;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (this.isLiving) {
g.fillRect(0, 0, getWidth() - 1, getHeight() - 1);
} else {
g.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
}
}
public static void main(String[] args) {
final int s = 40;
JPanel ui = new JPanel(new BorderLayout(4, 4));
final JLabel generationLabel = new JLabel("0", JLabel.CENTER);
ui.add(generationLabel, BorderLayout.PAGE_START);
final GameOfLife[][] biosphere = new GameOfLife[s][s];
final JPanel gui = new JPanel(new GridLayout(s, s, 2, 2));
ui.add(gui);
for (int ii = 0; ii < s; ii++) {
for (int jj = 0; jj < s; jj++) {
GameOfLife cell = new GameOfLife(ii, jj);
cell.setPreferredSize(new Dimension(10, 10));
gui.add(cell);
biosphere[ii][jj] = cell;
}
}
ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent ae) {
boolean[][] living = new boolean[s][s];
for (int ii = 0; ii < s; ii++) {
for (int jj = 0; jj < s; jj++) {
int top = (jj > 0 ? jj - 1 : s - 1);
int btm = (jj < s - 1 ? jj + 1 : 0);
int lft = (ii > 0 ? ii - 1 : s - 1);
int rgt = (ii < s - 1 ? ii + 1 : 0);
int neighbors = 0;
if (biosphere[ii][top].isLiving()) {
neighbors++;
}
if (biosphere[ii][btm].isLiving()) {
neighbors++;
}
if (biosphere[lft][top].isLiving()) {
neighbors++;
}
if (biosphere[lft][btm].isLiving()) {
neighbors++;
}
if (biosphere[lft][jj].isLiving()) {
neighbors++;
}
if (biosphere[rgt][jj].isLiving()) {
neighbors++;
}
if (biosphere[rgt][top].isLiving()) {
neighbors++;
}
if (biosphere[rgt][btm].isLiving()) {
neighbors++;
}
living[ii][jj] = biosphere[ii][jj].isAlive(neighbors);
}
}
for (int ii = 0; ii < s; ii++) {
for (int jj = 0; jj < s; jj++) {
biosphere[ii][jj].setAlive(living[ii][jj]);
}
}
generationLabel.setText("Generation: " + generation++);
gui.repaint();
}
};
Timer timer = new Timer(50, al);
timer.start();
JOptionPane.showMessageDialog(null, ui);
timer.stop();
}
}
回答2:
I think you must get an error. You never initialise your counter. Change
public static int count;
to
public static int count = 0;
and try what happens
回答3:
Here's the way I've implemented it before, I use 2 boolean arrays to check the current state of the board and save it to a new array, then copy the new array values to the current state array and repaint the board:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Random;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class GameOfLife {
public static final int ROWS = 30;
public static final int COLS = 30;
private JFrame frame;
private JPanel pane;
private Cell[][] cells;
private boolean[][] currentState;
private boolean[][] newState;
private boolean isAlive = false;
private JButton startButton;
private JButton stopButton;
private Timer timer;
private JSlider slider;
private JLabel label;
private int interations;
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new GameOfLife().createAndShowGui());
}
public void randomGeneration() {
Random r = new Random();
for (int i = 0; i < ROWS; i++) {
for (int j = 0; j < COLS; j++) {
currentState[i][j] = r.nextBoolean();
cells[i][j].setAlive(currentState[i][j]);
}
}
}
public void createAndShowGui() {
frame = new JFrame(getClass().getSimpleName());
slider = new JSlider(JSlider.HORIZONTAL, 0, 1000, 500);
slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
timer.setDelay(slider.getValue());
}
});
label = new JLabel("Number of iterations: " + interations);
timer = new Timer(slider.getValue(), listener);
timer.setInitialDelay(slider.getValue());
pane = new JPanel(new GridLayout(ROWS, COLS));
cells = new Cell[ROWS][COLS];
currentState = new boolean[ROWS][COLS];
newState = new boolean[ROWS][COLS];
startButton = new JButton("Start");
stopButton = new JButton("Stop");
for (int i = 0; i < ROWS; i++) {
for (int j = 0; j < COLS; j++) {
currentState[i][j] = false;
newState[i][j] = false;
isAlive = currentState[i][j];
cells[i][j] = new Cell(isAlive);
cells[i][j].setBorder(BorderFactory.createLineBorder(Color.BLACK));
cells[i][j].addMouseListener(mouseListener);
pane.add(cells[i][j]);
}
}
startButton.addActionListener(listener);
stopButton.addActionListener(listener);
frame.add(slider, BorderLayout.NORTH);
frame.add(pane);
frame.add(startButton, BorderLayout.WEST);
frame.add(stopButton, BorderLayout.EAST);
frame.add(label, BorderLayout.SOUTH);
randomGeneration();
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
}
public void updateState(int i, int j) {
currentState[i][j] = !currentState[i][j];
cells[i][j].setAlive(currentState[i][j]);
cells[i][j].repaint();
}
ActionListener listener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource().equals(startButton)) {
if (!timer.isRunning()) {
timer.start();
} else {
timer.restart();
}
} else if (e.getSource().equals(stopButton)) {
timer.stop();
} else {
for (int i = 0; i < ROWS; i++) {
for (int j = 0; j < COLS; j++) {
int neighbors = 0;
if (i - 1 > 0) {
if (j - 1 > 0) {
if (currentState[i - 1][j - 1]) {
neighbors++;
}
}
if (j + 1 < COLS) {
if (currentState[i - 1][j + 1]) {
neighbors++;
}
}
if (currentState[i - 1][j]) {
neighbors++;
}
}
if (i + 1 < ROWS) {
if (j - 1 > 0) {
if (currentState[i + 1][j - 1]) {
neighbors++;
}
}
if (j + 1 < COLS) {
if (currentState[i + 1][j + 1]) {
neighbors++;
}
}
if (currentState[i + 1][j]) {
neighbors++;
}
}
if (j - 1 > 0) {
if (currentState[i][j - 1]) {
neighbors++;
}
}
if (j + 1 < COLS) {
if (currentState[i][j + 1]) {
neighbors++;
}
}
if (currentState[i][j]) {
if (neighbors < 2 || neighbors >= 4) {
newState[i][j] = false;
} else {
newState[i][j] = true;
}
} else {
if (neighbors == 3) {
newState[i][j] = true;
}
}
}
}
for (int i = 0; i < ROWS; i++) {
for (int j = 0; j < COLS; j++) {
currentState[i][j] = newState[i][j];
cells[i][j].setAlive(currentState[i][j]);
cells[i][j].revalidate();
cells[i][j].repaint();
}
}
interations++;
label.setText("Number of iterations: " + interations);
pane.revalidate();
pane.repaint();
}
}
};
MouseListener mouseListener = new MouseListener() {
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseClicked(MouseEvent e) {
for (int i = 0; i < ROWS; i++) {
for (int j = 0; j < COLS; j++) {
if (e.getSource().equals(cells[i][j])) {
updateState(i, j);
break;
}
}
}
}
};
}
@SuppressWarnings("serial")
class Cell extends JPanel {
private boolean isAlive;
public Cell(boolean isAlive) {
this.isAlive = isAlive;
}
public boolean isAlive() {
return isAlive;
}
public void setAlive(boolean isAlive) {
this.isAlive = isAlive;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(20, 20);
}
@Override
public Color getBackground() {
return isAlive ? Color.GREEN : Color.GRAY;
}
}
It also includes a JSlider to manage processing speed:
Have fun and notice that I used a Swing Timer instead of the Util Timer you're using.
来源：https://stackoverflow.com/questions/42935037/how-do-i-add-a-feature-where-i-can-get-the-generation-in-my-game-of-life-program