我正在使用递归方法为 Boggle 板上由用户输入的 JButton 着色。例如，如果使用单词“CAT”作为单词参数，则该方法将搜索 Buttons[][] 数组以查找旁边有“A”和“T”的“C”，并将相应的按钮着色为橙色并返回 true。但是，我的代码存在一个问题，即像 CATATATAT 这样的单词也会返回 true，因为我的代码无意中允许重复使用按钮。
问题是我无法检查 JButton 是否已被使用(已为橙色)。当我在递归方法中使用 getBackground() 时，我发现 JButton 仍然是默认的白色，即使它们在视觉上是橙色的。关于如何检测 JButton 已被使用(已呈橙色)有什么想法吗？
JButton[][] buttons = new JButton[4][4];
Color orange = new Color(245, 130, 32);
假设 JButton 数组中充满了新按钮，每个按钮上有一个随机字母
public boolean findWord(String word) {
clearButtons();
for (int row = 0; row < length; row++) {
for (int col = 0; col < length; col++) {
if (findWord(word, row, col)) {
System.out.println("");
return true;
}
}
}
return false;
}
private boolean findWord(String word, int row, int col) {
if(word.equals("")) {
return true;
}
if (row < 0 || row >= length ||
col < 0 || col >= length ||
!(buttons[row][col].getText().equals(word.substring(0,1))) ||
buttons[row][col].getBackground().equals(orange) // <- always is false
) {
return false;
}
String rest = word.substring(1, word.length());
boolean letter =
findWord(rest, row-1, col-1) ||
findWord(rest, row-1, col) ||
findWord(rest, row-1, col+1) ||
findWord(rest, row, col-1) ||
findWord(rest, row, col+1) ||
findWord(rest, row+1, col-1) ||
findWord(rest, row+1, col) ||
findWord(rest, row+1, col+1);
if(letter) {
buttons[row][col].setBackground(orange); // <- despite this
}
return letter;
}
我已经尝试尽可能地减少程序以使其可以运行。只需在文本区域中键入重复单词的一部分的内容即可。 这是一个完整的可运行版本:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.text.JTextComponent;
public class BoggleGame extends JFrame implements ActionListener, KeyListener {
private static final long serialVersionUID = -3125864417227564060L;
String[] wordArray = new String[0];
static String username;
int length = 4;
public JTextArea searchTextArea = new JTextArea(0,12);
DefaultListModel wordListModel= new DefaultListModel();
JButton[][] buttons = new JButton[length][length];
JList wordList = new JList(wordListModel);
JScrollPane wordScrollPane = new JScrollPane(wordList);
JPanel northPanel = new JPanel();
JPanel timePanel = new JPanel();
JPanel usernamePanel = new JPanel();
JPanel southPanel = new JPanel();
JPanel centerPanel = new JPanel();
JPanel eastPanel = new JPanel();
ImageIcon logo = new ImageIcon(getClass().getResource("logo.png"));
Color white = new Color(255,255,255);
Color blue = new Color(0,150 ,240);
Color orange = new Color(245, 130, 32);
Color dark_orange = new Color(180, 117 , 70);
public static void main(String[] arguments){
new BoggleGame();
}
public BoggleGame(){
// Set Title
super("");
// Set up Frame
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Set Layout
getContentPane().setLayout(new BorderLayout());
nimbusLookAndFeel();
// North Panel
northPanel.setLayout(new GridLayout(1,3));
northPanel.setPreferredSize(new Dimension(550,100));
northPanel.setBackground(blue);
// Username Panel
usernamePanel.setLayout(new FlowLayout(FlowLayout.LEFT));
usernamePanel.setBackground(blue);
JLabel usernameLabel = new JLabel("Username:");
usernamePanel.add(usernameLabel);
JTextArea usernameTextArea = new JTextArea();
usernameTextArea.setText(Login.username);
usernamePanel.add(usernameTextArea);
northPanel.add(usernamePanel);
usernameTextArea.setEditable(false);
add(northPanel, BorderLayout.NORTH);
northPanel.add(usernamePanel);
// Logo
northPanel.add(new JLabel(logo));
// Time Panel
timePanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
timePanel.setBackground(blue);
JLabel timeLabel = new JLabel("Time:");
timePanel.add(timeLabel);
JTextArea timeTextArea = new JTextArea();
timeTextArea.setText("0");
timePanel.add(timeTextArea);
northPanel.add(timePanel);
timeTextArea.setEditable(false);
add(northPanel, BorderLayout.NORTH);
// South Panel
southPanel.setPreferredSize(new Dimension(550,50));
southPanel.setBackground(blue);
searchTextArea.setLineWrap(true);
southPanel.add(searchTextArea);
searchTextArea.setBorder(BorderFactory.createLineBorder(Color.BLACK));
searchTextArea.setFont(new Font("Geniva", Font.PLAIN, 30));
searchTextArea.addKeyListener((KeyListener) this);
JButton submitButton = new JButton("Submit");
submitButton.addActionListener(this);
southPanel.add(submitButton);
JButton quitButton = new JButton("Quit");
quitButton.addActionListener(this);
southPanel.add(quitButton);
getContentPane().add(southPanel, BorderLayout.SOUTH);
// Center Panel
centerPanel.setPreferredSize(new Dimension(400,400));
centerPanel.setBackground(blue);
centerPanel.setLayout(new GridLayout(length, length));
//generate buttons
for(int i=0; i<length; i++) {
for(int j=0; j<length; j++) {
buttons[i][j]=new JButton(Character.toString(((char)(int)(Math.random() * 25 + 65))));
buttons[i][j].setBackground(white);
//buttons[i][j].setForeground(white);
buttons[i][j].setFont(new Font("Geniva", Font.BOLD, 200/length));
buttons[i][j].addActionListener(this);
centerPanel.add(buttons[i][j]);
}
}
getContentPane().add(centerPanel, BorderLayout.CENTER);
// East Panel
eastPanel.add(wordScrollPane);
wordScrollPane.setPreferredSize(new Dimension(150,400));
eastPanel.setBackground(blue);
getContentPane().add(eastPanel, BorderLayout.EAST);
// Finalize
pack();
searchTextArea.requestFocusInWindow();
setLocationRelativeTo(null);
setVisible(true);
}
public void nimbusLookAndFeel() {
try {
for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (Exception e) {
}
}
public void clearButtons() {
for(int i= 0; i<buttons.length; i++) {
for(int j=0; j<buttons[0].length; j++) {
buttons[i][j].setBackground(white);
}
}
}
public void submitWord() {
if(findWord(searchTextArea.getText()) && !(searchTextArea.getText().equals(""))){
wordListModel.addElement(searchTextArea.getText().toUpperCase());
} else {
wordListModel.addElement("Not a word!");
}
searchTextArea.getDocument().putProperty("filterNewlines", Boolean.TRUE);
wordList.ensureIndexIsVisible(wordListModel.size()-1);
searchTextArea.setText("");
}
@Override
public void actionPerformed(ActionEvent e) {
// Check if source is the Submit Button
if(((JButton) e.getSource()).getText().equals("Submit")){
submitWord();
// Check if source is the Quit Button
} else if(((JButton) e.getSource()).getText().equals("Quit")){
dispose();
// Source must be a Letter Button
} else if(!((JButton) e.getSource()).getBackground().equals(orange)){
searchTextArea.append(((JButton) e.getSource()).getText());
((JButton) e.getSource()).setBackground(orange);
}
searchTextArea.requestFocusInWindow();
}
@Override
public void keyPressed(KeyEvent e) {
searchTextArea.setText(searchTextArea.getText().toUpperCase());
if (e.getKeyCode()==KeyEvent.VK_ENTER){
submitWord();
}
}
@Override
public void keyReleased(KeyEvent e) {
searchTextArea.setText(searchTextArea.getText().toUpperCase());
if(!findWord(searchTextArea.getText())) {
clearButtons();
}
if (e.getKeyCode()==KeyEvent.VK_ENTER){
searchTextArea.setText("");
}
}
@Override
public void keyTyped(KeyEvent e) {
}
// here is the method that does not work!
public boolean findWord(String word) {
clearButtons();
for (int row = 0; row < length; row++) {
for (int col = 0; col < length; col++) {
if (findWord(word, row, col)) {
System.out.println("");
return true;
}
}
}
return false;
}
private boolean findWord(String word, int row, int col) {
if(word.equals("")) {
return true;
}
if (row < 0 || row >= length ||
col < 0 || col >= length ||
!(buttons[row][col].getText().equals(word.substring(0,1))) ||
buttons[row][col].getBackground().equals(orange) //<-doesn't work
) {
return false;
}
System.out.println(buttons[row][col].getBackground());
String rest = word.substring(1, word.length());
boolean letter =
findWord(rest, row-1, col-1) ||
findWord(rest, row-1, col) ||
findWord(rest, row-1, col+1) ||
findWord(rest, row, col-1) ||
findWord(rest, row, col+1) ||
findWord(rest, row+1, col-1) ||
findWord(rest, row+1, col) ||
findWord(rest, row+1, col+1);
if(letter) {
buttons[row][col].setBackground(orange);
}
return letter;
}
}
最佳答案
如 Java Docs 中所述
public Color getBackground()Gets the background color of this component.
Returns: this component's background color; if this component does not have a background color, the background color of its parent is returned
此方法返回 Color 的实例，因此您需要比较 Color.orange 或 Color.ORANGE
关于java - 递归和/或 getBackground() 未按预期工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30499776/