我一直试图让我的代码在用滑块点击okay按钮后重置，但是，我没有运气。有没有人知道如何将其合并到我的代码中？
P.S。重置必须在类字段中。
package GUI;
import java.awt.GridLayout;
import javax.swing.JPanel;
public class GameDisplay extends JPanel {
private static final long serialVersionUID = 1L;
private boolean activated;
public GameDisplay(Model.Field field) {
setLayout(new GridLayout(GUI.SizeDialog.currentRows, GUI.SizeDialog.currentColumns));
for (int i = 0; i < GUI.SizeDialog.currentRows; ++i) {
for (int j = 0; j < GUI.SizeDialog.currentColumns; ++j) {
add(field.Cells[i][j]);
}
}
}
public boolean isActive() {
return activated;
}
public void setActive(boolean activated) {
this.activated = activated;
}
}
Field package Model;
import java.awt.Dimension;
import java.util.ArrayList;
import GUI.SizeDialog;
public class Field {
private int difficultyFactor;
public static final int EASY = 1;
public static final int NORMAL = 2;
public static final int HARD = 3;
public Cell[][] Cells;
public Field() {
Cells = new Cell[GUI.SizeDialog.currentRows][GUI.SizeDialog.currentColumns];
for (int i = 0; i < GUI.SizeDialog.currentRows; ++i) {
for (int j = 0; j < GUI.SizeDialog.currentColumns; ++j) {
Cells[i][j]= new Cell();
}
}
}
public void reset(){
Cells = new Cell[GUI.SizeDialog.currentRows][GUI.SizeDialog.currentColumns];
for (int i = 0; i < GUI.SizeDialog.currentRows; ++i) {
for (int j = 0; j < GUI.SizeDialog.currentColumns; ++j) {
Cells[i][j]= new Cell();
}
}
}
public void setDifficultyFactor(int level) {
switch (level) {
case EASY:
difficultyFactor = EASY;
break;
case NORMAL:
difficultyFactor = NORMAL;
break;
case HARD:
difficultyFactor = HARD;
break;
default:
difficultyFactor = NORMAL;
}
}
}
SizeDialog package GUI;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Hashtable;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import Model.Field;
public class SizeDialog extends JDialog {
private static final long serialVersionUID = 1L;
private Model.Field field;
private GUI.GameDisplay GameDisplay;
public static Integer currentRows = 4;
public static Integer currentColumns = 4;
public SizeDialog() {
JPanel dialogBoxPanel = new JPanel();
BorderLayout dialogLayout = new BorderLayout();
dialogBoxPanel.setLayout(dialogLayout);
JSlider rowCount = new JSlider(4, 10, 4);
JSlider columnCount = new JSlider(4, 10, 4);
Hashtable<Integer, JLabel> labelTable = new Hashtable<Integer, JLabel>();
labelTable.put(new Integer(4), new JLabel("4"));
labelTable.put(new Integer(10), new JLabel("10"));
rowCount.setLabelTable(labelTable);
rowCount.setPaintLabels(true);
columnCount.setLabelTable(labelTable);
columnCount.setPaintLabels(true);
JLabel row = new JLabel();
JLabel column = new JLabel();
JPanel rowPanel = new JPanel();
JPanel columnPanel = new JPanel();
JLabel rowPosition = new JLabel();
rowPosition.setText("Rows: 4");
JLabel columnPosition = new JLabel();
columnPosition.setText("Columns: 4");
rowCount.addChangeListener(getCurrentRows(rowCount, "row", rowPosition));
columnCount.addChangeListener(getCurrentColumns(columnCount, "column", columnPosition));
JButton okButton = new JButton("OK");
okButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
field.reset();
SizeDialog.this.dispose();
}
});
rowPanel.add(rowPosition, BorderLayout.WEST);
rowPanel.add(row, BorderLayout.CENTER);
rowPanel.add(rowCount, BorderLayout.EAST);
columnPanel.add(columnPosition, BorderLayout.WEST);
columnPanel.add(column, BorderLayout.CENTER);
columnPanel.add(columnCount, BorderLayout.EAST);
dialogBoxPanel.add(rowPanel, BorderLayout.NORTH);
dialogBoxPanel.add(columnPanel, BorderLayout.CENTER);
dialogBoxPanel.add(okButton, BorderLayout.SOUTH);
setContentPane(dialogBoxPanel);
setMinimumSize(new Dimension(300, 150));
setLocationRelativeTo(null);
}
private ChangeListener getCurrentColumns(final JSlider columnCount, final String string, final JLabel columnPosition) {
ChangeListener changeListener = new ChangeListener() {
public void stateChanged(ChangeEvent changeEvent) {
JSlider theSlider = (JSlider) changeEvent.getSource();
if (!theSlider.getValueIsAdjusting()) {
int sliderValue = theSlider.getValue();
columnPosition.setText("columns:" + sliderValue);
SizeDialog.currentColumns = sliderValue;
}
}
};
return changeListener;
}
private ChangeListener getCurrentRows(final JSlider rowCount, final String string, final JLabel rowPosition) {
ChangeListener changeListener = new ChangeListener() {
public void stateChanged(ChangeEvent changeEvent) {
JSlider theSlider = (JSlider) changeEvent.getSource();
if (!theSlider.getValueIsAdjusting()) {
int sliderValue = theSlider.getValue();
rowPosition.setText("Rows:" + sliderValue);
SizeDialog.currentRows = sliderValue;
}
}
};
return changeListener;
}
}
MainFrame package GUI;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
public class MainFrame extends JFrame {
private static final long serialVersionUID = 1L;
private static JPanel centerPanel;
public static final String EASY = "Easy";
public static final String NORMAL = "Normal";
public static final String HARD = "Hard";
public MainFrame(JPanel centerPanel) {
// Setup of Main
super("The True/False Game");
this.centerPanel = centerPanel;
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setup();
}
private void setup() {
// Setup of centerPanel
add(centerPanel);
pack();
}
public JMenuBar setUpMenuBar(ActionListener listener) {
// create the necessary menu items and menus
JMenuBar menuBar = new JMenuBar();
JMenu settingsMenu = new JMenu("Settings");
JMenuItem size = new JMenuItem("Size");
size.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Object valueBox = new SizeDialog();
((Window) valueBox).setVisible(true);
}
});
JMenu difficultyMenu = new JMenu("Difficulty Level");
ButtonGroup levelGroup = new ButtonGroup();
JCheckBoxMenuItem easyDifficultyItem = new JCheckBoxMenuItem(EASY);
JCheckBoxMenuItem normalDifficultyItem = new JCheckBoxMenuItem(NORMAL);
JCheckBoxMenuItem hardDifficultyItem = new JCheckBoxMenuItem(HARD);
easyDifficultyItem.setSelected(true); // Default difficulty setting
// this button group ensures that only one check box is selected
levelGroup.add(easyDifficultyItem);
levelGroup.add(normalDifficultyItem);
levelGroup.add(hardDifficultyItem);
difficultyMenu.add(easyDifficultyItem);
difficultyMenu.add(normalDifficultyItem);
difficultyMenu.add(hardDifficultyItem);
settingsMenu.add(size);
settingsMenu.add(difficultyMenu);
menuBar.add(settingsMenu);
// use a single listener to handle all menu item selections
for (int i = 0; i < menuBar.getMenuCount(); ++i) {
for (JMenuItem item : getMenuItems(menuBar.getMenu(i))) {
item.addActionListener(listener);
}
}
return menuBar;
}
// this recursion works because JMenu is a subclass of JMenuItem!
private static List<JMenuItem> getMenuItems(JMenuItem item) {
List<JMenuItem> items = new ArrayList<>();
if (item instanceof JMenu) {
JMenu menu = (JMenu) item;
for (int i = 0; i < menu.getItemCount(); ++i) {
items.addAll(getMenuItems(menu.getItem(i)));
}
} else {
items.add(item);
}
return items;
}
}
App import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JMenuBar;
import Model.Cell;
import Model.Field;
import GUI.MainFrame;
import GUI.SizeDialog;
public class App {
// Main Objects
private static GUI.MainFrame MainFrame;
private static GUI.GameDisplay GameDisplay;
private static Model.Field field;
public static GUI.SizeDialog SizeDialog;
public static void main(String[] args) {
// Setup of the Main Objects
field = new Model.Field();
GameDisplay = new GUI.GameDisplay(field);
MainFrame = new MainFrame(GameDisplay);
MainFrame.setMinimumSize(new Dimension(500, 500));
MainFrame.getContentPane().add(GameDisplay);
// Setup of the Menu Bar
JMenuBar menuBar = MainFrame.setUpMenuBar(menuListener);
MainFrame.setJMenuBar(menuBar);
// Show the Mainframe in the center of the desktop screen
MainFrame.setLocationRelativeTo(null);
MainFrame.setVisible(true);
}
// listener for the menu items in MainFrame
private static ActionListener menuListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
switch (e.getActionCommand()) {
case GUI.MainFrame.EASY:
field.setDifficultyFactor(Field.EASY);
GameDisplay.setActive(true);
break;
case GUI.MainFrame.NORMAL:
field.setDifficultyFactor(Field.NORMAL);
GameDisplay.setActive(true);
break;
case GUI.MainFrame.HARD:
field.setDifficultyFactor(Field.HARD);
GameDisplay.setActive(true);
break;
}
}
};
};
答案 0 :(得分：1)
目前正在Field班级中创建App班级的实例。您field类中的私有字段SizeDialog当前未设置为App类已知的实例。此问题的解决方案是将Field实例作为参数提供。
可能的解决方案如下：
应用：
public class App {
// Main Objects
private static GUI.MainFrame MainFrame;
private static GUI.GameDisplay GameDisplay;
private static Model.Field field;
public static GUI.SizeDialog SizeDialog;
public static void main(String[] args) {
// Setup of the Main Objects
field = new Model.Field();
GameDisplay = new GUI.GameDisplay(field);
MainFrame = new MainFrame(GameDisplay, field);
/* the rest of your code */
}
/* more App code */
}
大型机：
public class MainFrame extends JFrame {
private static final long serialVersionUID = 1L;
private static JPanel centerPanel;
public static final String EASY = "Easy";
public static final String NORMAL = "Normal";
public static final String HARD = "Hard";
private Model.Field field;
public MainFrame(JPanel centerPanel, Model.Field field) {
this.field = field;
/* the rest of your code */
}
public JMenuBar setUpMenuBar(ActionListener listener) {
// create the necessary menu items and menus
JMenuBar menuBar = new JMenuBar();
JMenu settingsMenu = new JMenu("Settings");
JMenuItem size = new JMenuItem("Size");
size.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Object valueBox = new SizeDialog(field);
((Window) valueBox).setVisible(true);
}
});
/* the rest of your code */
}
/* more MainFrame code */
}
SizeDialog：
public class SizeDialog extends JDialog {
private static final long serialVersionUID = 1L;
private final Model.Field field;
private GUI.GameDisplay GameDisplay;
public static Integer currentRows = 4;
public static Integer currentColumns = 4;
public SizeDialog(final Model.Field field) {
this.field = field;
/* the rest of your code */
}
/* more SizeDialog code */
}
编辑：如this answer中所述，匿名类中引用的对象必须是最终的。