我有一个实现KeyListener的小类，但即使我实现了所有方法，包括keyPressed（），并且给了它们所有代码来运行，当我按下enter（return）键时没有任何反应。
这是我实现KeyListener的类（实现的方法在底部）：
public class TestPanel extends JPanel implements KeyListener {
Words word = new Words();
private JLabel rootLabel;
JLabel rootField;
private JLabel defLabel;
JTextField defField;
private JButton ok;
TestListener listener;
private JLabel correctLabel;
private JLabel incorrectLabel;
private int correctCount = 0;
private int incorrectCount = 0;
ActionListener okListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (defField.getText().equals("")) {
} else {
String root = word.getRoot();
String def = word.getDef();
boolean status;
if (defField.getText().equals(word.getDef())) {
correctCount++;
correctLabel.setText("Correct: " + correctCount);
status = true;
} else {
incorrectCount++;
incorrectLabel.setText("Incorrect: " + incorrectCount);
status = false;
}
defField.setText("");
word.setRootAndDef();
rootField.setText(word.getRoot());
TestEvent event = new TestEvent(ok, root, def, status);
listener.dataSubmitted(event);
}
}
};
public TestPanel() {
word = new Words();
rootLabel = new JLabel("Root: ");
rootField = new JLabel();
defLabel = new JLabel("Definition: ");
defField = new JTextField(20);
ok = new JButton("OK");
correctLabel = new JLabel("Correct: " + correctCount);
incorrectLabel = new JLabel("Incorrect: " + incorrectCount);
ok.setMnemonic(KeyEvent.VK_O);
setBorder(BorderFactory.createTitledBorder("Test"));
ok.addActionListener(okListener);
setLayout(new GridBagLayout());
GridBagConstraints gc = new GridBagConstraints();
// First row
gc.weightx = 1;
gc.weighty = 0.2;
gc.gridx = 0;
gc.gridy = 0;
gc.anchor = GridBagConstraints.LINE_END;
gc.insets = new Insets(0, 0, 0, 5);
add(rootLabel, gc);
gc.gridx = 1;
gc.anchor = GridBagConstraints.LINE_START;
gc.insets = new Insets(0, 0, 0, 0);
add(rootField, gc);
// Next row
gc.gridx = 0;
gc.gridy = 1;
gc.anchor = GridBagConstraints.LINE_END;
gc.insets = new Insets(0, 0, 0, 5);
add(defLabel, gc);
gc.gridx = 1;
gc.gridy = 1;
gc.anchor = GridBagConstraints.LINE_START;
gc.insets = new Insets(0, 0, 0, 0);
add(defField, gc);
// Next row
gc.weighty = 2;
gc.gridx = 1;
gc.gridy = 2;
gc.anchor = GridBagConstraints.FIRST_LINE_START;
add(ok, gc);
// Next row
gc.weighty = 0.1;
gc.weightx = 1;
gc.gridx = 0;
gc.gridy = 3;
gc.anchor = GridBagConstraints.LINE_END;
gc.insets = new Insets(0, 0, 0, 20);
add(correctLabel, gc);
gc.weighty = 0.1;
gc.weightx = 1;
gc.gridx = 1;
gc.gridy = 3;
gc.anchor = GridBagConstraints.LINE_START;
gc.insets = new Insets(0, 0, 0, 0);
add(incorrectLabel, gc);
}
public void setTestListener(TestListener listener) {
this.listener = listener;
}
public int getCorrectCount() {
return correctCount;
}
public int getIncorrectCount() {
return incorrectCount;
}
public void setCorrectCount(int correctCount) {
this.correctCount = correctCount;
}
public void setIncorrectCount(int incorrectCount) {
this.incorrectCount = incorrectCount;
}
public void setCorrectLabel(String text) {
correctLabel.setText(text);
}
public void setIncorrectLabel(String text) {
incorrectLabel.setText(text);
}
@Override
public void keyPressed(KeyEvent keySource) {
int key = keySource.getKeyCode();
if(key == KeyEvent.VK_ENTER) {
if (defField.getText().equals("")) {
} else {
String root = word.getRoot();
String def = word.getDef();
boolean status;
if (defField.getText().equals(word.getDef())) {
correctCount++;
correctLabel.setText("Correct: " + correctCount);
status = true;
} else {
incorrectCount++;
incorrectLabel.setText("Incorrect: " + incorrectCount);
status = false;
}
defField.setText("");
word.setRootAndDef();
rootField.setText(word.getRoot());
TestEvent event = new TestEvent(ok, root, def, status);
listener.dataSubmitted(event);
}
}
}
@Override
public void keyReleased(KeyEvent keySource) {
int key = keySource.getKeyCode();
if(key == KeyEvent.VK_ENTER) {
if (defField.getText().equals("")) {
} else {
String root = word.getRoot();
String def = word.getDef();
boolean status;
if (defField.getText().equals(word.getDef())) {
correctCount++;
correctLabel.setText("Correct: " + correctCount);
status = true;
} else {
incorrectCount++;
incorrectLabel.setText("Incorrect: " + incorrectCount);
status = false;
}
defField.setText("");
word.setRootAndDef();
rootField.setText(word.getRoot());
TestEvent event = new TestEvent(ok, root, def, status);
listener.dataSubmitted(event);
}
}
}
@Override
public void keyTyped(KeyEvent keySource) {
int key = keySource.getKeyCode();
if(key == KeyEvent.VK_ENTER) {
if (defField.getText().equals("")) {
} else {
String root = word.getRoot();
String def = word.getDef();
boolean status;
if (defField.getText().equals(word.getDef())) {
correctCount++;
correctLabel.setText("Correct: " + correctCount);
status = true;
} else {
incorrectCount++;
incorrectLabel.setText("Incorrect: " + incorrectCount);
status = false;
}
defField.setText("");
word.setRootAndDef();
rootField.setText(word.getRoot());
TestEvent event = new TestEvent(ok, root, def, status);
listener.dataSubmitted(event);
}
}
}
}
答案 0 :(得分：2)
我有一个实现KeyListener的小类，但即使我实现了所有方法，包括keyPressed（），并且给了它们所有代码来运行，当我按下enter（return）键时没有任何反应。请帮我解决这个问题，这里是我实现KeyListener的类（实现的方法在底部）：
简短的回答，不要。如果您认为自己需要setTimeout(function () {
$('.google-visualization-table').css("z-index", "1");
}, 500);
，那么您可能不会感到兴奋。 KeyListener是一个很少需要使用的低级API，因为通常有更好的方法来实现相同的功能。
在您的情况下，KeyListener和JTextField都通过JButton界面支持事件通知。在ActionListener的情况下，当用户按下＆＃34;动作时，这将通知您。当字段被聚焦时键，而在JTextField的情况下，当用户按下＆＃34;动作＆＃34;时，按钮助记键组合或用鼠标按下按钮。
JButton API旨在消除检测此功能所涉及的复杂性，并为您提供一个简单的回调，您可以通过该回调执行所需的操作。让我们面对现实，我们并不关心＆＃34;如何＆＃34;组件被激活，只是它
相反，摆脱ActionListener并简单地使用类似......
KeyListener这样，用户不需要按下按钮，但可以按下＆＃34;动作＆＃34;该字段的密钥和相同的功能将被执行。
有关详细信息，请参阅How to Use Text Fields，How to Use Buttons, Check Boxes, and Radio Buttons和How to Write an Action Listeners