目前正致力于一个相当简单的学校计划。我一直在努力教自己如何使用JFileChooser并遇到一个小问题。在通过它的相应按钮调用JFileChooser之后，每次按下任何其他按钮时窗口都会打开。我的代码很草率，因为我不确定它的全部功能，所以我想知道是否有办法阻止窗口手动打开？我做了很多研究，似乎找不到任何类似的东西。
就像我之前说的那样，代码很草率，但是如果有人有时间给它一眼就知道了。
public class Scramble extends JFrame
{
private final JFileChooser chooser = new JFileChooser();
Random randNum;
private int score = 0;
private int guess = 0;
private int totalWords;
private int currentWord;
private File file;
private ArrayList<String> originalWords = new ArrayList<>();
private JLabel labelScrambledWord = new JLabel("Unscramble");
private JTextField textUserGuess = new JTextField(28);
private JButton buttonCheck = new JButton("Check");
private JButton buttonGiveUp = new JButton("Give Up");
private JButton buttonBrowse = new JButton("Browse");
private JPanel mainPanel = new JPanel();
public Scramble()
{
// Sets current word to random number
randNum = new Random();
changeCurrentWord();
// Sets label to scrambled word as soon as program opens
newWord();
mainPanel.add(labelScrambledWord);
mainPanel.add(textUserGuess);
buttonCheck.addActionListener(new ButtonListener());
buttonGiveUp.addActionListener(new ButtonListener());
buttonBrowse.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
browseButtonClicked();
}
});
mainPanel.add(buttonCheck);
mainPanel.add(buttonGiveUp);
mainPanel.add(buttonBrowse);
this.add(mainPanel);
}
private void browseButtonClicked()
{
chooser.setCurrentDirectory(new java.io.File("."));
chooser.setDialogTitle("Browse for text file");
FileNameExtensionFilter filter = new FileNameExtensionFilter("Txt File", "txt");
chooser.setFileFilter(filter);
int buttonVal = chooser.showOpenDialog(this);
if(buttonVal == JFileChooser.APPROVE_OPTION)
{
file = chooser.getSelectedFile();
try
{
readFile();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
private void changeCurrentWord()
{
if(originalWords.size() > 0)
{
currentWord = randNum.nextInt(originalWords.size());
}
}
private void newWord()
{
// Checks if any words are left and then sets new word
if(originalWords.size() > 0)
{
labelScrambledWord.setText(scramble(originalWords.get(currentWord)));
}
// Changes text field to display total score
else if(totalWords > 0)
{
textUserGuess.setText("Complete: Your score is " + String.format("%.2f", (double)score/(double)totalWords) + "/" + 5);
}
else
{
textUserGuess.setText("Input text file");
}
}
/*
* Reads Strings from txt file
*/
private void readFile() throws IOException
{
// Grabs txt file from path
Scanner scan = new Scanner(file);
// Adds new words to ArrayList until there are none left
while (scan.hasNext())
{
originalWords.add(scan.next());
}
totalWords = originalWords.size();
scan.close();
}
/*
* Returns original word given in parameters as scrambled word
*/
private String scramble(String originalWord)
{
randNum = new Random();
int index;
// String that will be returned
String scrambledWord = "";
// Allows us to remove characters from original word after character has
// been added to scrambled word
String editedWord = originalWord;
for (int count = 0; count < originalWord.length(); count++)
{
index = randNum.nextInt(editedWord.length());
scrambledWord += editedWord.substring(index, index + 1);
// Removes the character added to the scrambled word from original
editedWord = editedWord.substring(0, index) + editedWord.substring(index + 1);
}
return scrambledWord;
}
/*
* ButtonListener class to use as action listener for buttons
*/
private class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
// Checks which button was clicked
if (e.getActionCommand().equals("Check"))
{
checkButtonClicked();
}
// Executed when "Give Up" button is pressed
else if (e.getActionCommand().equals("Give Up"))
{
giveUpButtonClicked();
}
else if(e.getActionCommand().equals("Browse"));
{
browseButtonClicked();
}
}
// Executed if buttonCheck is clicked
private void checkButtonClicked()
{
//Closes program if user hits another button after words are gone
if(originalWords.size() == 0)
{
System.exit(0);
}
if (textUserGuess.getText().equalsIgnoreCase(originalWords.get(currentWord)))
{
textUserGuess.setText("That is correct. Here is a new word to try.");
// Removes word from list
originalWords.remove(currentWord);
// Sets new current word
changeCurrentWord();
// Adds score based on number of guesses currently
addScore();
// Changes word to new word
newWord();
}
else
{
textUserGuess.setText("Sorry, that is incorrect. Please try again.");
// Adds a guess to the count after wrong answer
guess++;
}
}
// Executed if buttonGiveUp is clicked
private void giveUpButtonClicked()
{
// Closes program if user hits another button after words are gone
if(originalWords.size() == 0)
{
System.exit(0);
}
// Displays answer to user
textUserGuess.setText(originalWords.get(currentWord));
// Removes word from list
originalWords.remove(currentWord);
// Changes current word being displayed
changeCurrentWord();
// Sets guess back to 0 for new word
guess = 0;
// Sets new scrambled word
newWord();
}
/*
* Adds to player score based on number of guesses used
*/
private void addScore()
{
switch (guess)
{
case 0:
score += 5;
break;
case 1:
score += 3;
break;
case 2:
score += 1;
break;
default:
score += 0;
}
guess = 0;
}
}
public static void main(String[] args)
{
Scramble frame = new Scramble();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
// Prevents user from changing dimensions and causing interface to look
// different than intended.
frame.setResizable(false);
frame.setVisible(true);
}
}
答案 0 :(得分：0)
显然我需要一些睡眠。问题是因为我在按钮上有两个动作监听器，其中一个正在与其他人一起调用。