正如标题所说。摆动textArea并未发射。我使用getter从主KeyGUI类中获取组件。在下面的代码中是＆＃34;主类＆＃34;：
public class KeyGUI {
/*
* Version: 1.0
*
* I have declared instance variables: frame, textArea and btnSave.
* I also made 3 methods called: guiLayout and guiSettings, guiListeners
* I will explain everything in details in their respective bodies.
*/
JFrame frame = new JFrame();
JTextArea textArea = new JTextArea();
JButton btnSave = new JButton("Save log");
public void guiListeners() {
/*
* Version: 1.0
*
* I have made this method.
* It's primary use is to set all kinds of listeners that
* GUI components need.
* Added KeyListener to textArea and added ActionListener to btnSave.
*/
Logger loggerObj = new Logger();
textArea.addKeyListener(loggerObj.getE());
btnSave.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String text = textArea.getText();
String fileName = JOptionPane.showInputDialog("Input the name of your file:");
File fileDir = new File(FileSystemView.getFileSystemView().getDefaultDirectory().getPath().toString() + "/Logger/");
if (!fileDir.exists()) {
fileDir.mkdir();
}
File fileLoc = new File(FileSystemView.getFileSystemView().getDefaultDirectory().getPath().toString() + "/Logger/" + fileName + ".txt");
BufferedWriter bw = null;
try {
FileWriter fw = new FileWriter(fileLoc);
bw = new BufferedWriter(fw);
text = text.replaceAll("(?!\\r)\\n", "\r\n");
bw.write(text);
} catch (IOException e1) {
System.err.println(e1 + "IOException at line 98");
} finally {
if (bw != null) {
try {
bw.close();
} catch (IOException e2) {
System.err.println(e2 + "Error closing buffered reader at line 104");
}
}
}
}
});
}
public void guiLayout() {
/*
* Version: 1.0
*
* Methods created.
* This method is used only for setting the layout for GUI and it's components.
* Using springLayout I was able to completely manipulate look of GUI.
* Only textArea and btnSave are added. Only ones needed anyway.
*/
SpringLayout springLayout = new SpringLayout();
frame.getContentPane().setLayout(springLayout);
springLayout.putConstraint(SpringLayout.NORTH, textArea, 10, SpringLayout.NORTH, frame.getContentPane());
springLayout.putConstraint(SpringLayout.WEST, textArea, 10, SpringLayout.WEST, frame.getContentPane());
springLayout.putConstraint(SpringLayout.SOUTH, textArea, 192, SpringLayout.NORTH, frame.getContentPane());
springLayout.putConstraint(SpringLayout.EAST, textArea, -10, SpringLayout.EAST, frame.getContentPane());
frame.getContentPane().add(textArea);
springLayout.putConstraint(SpringLayout.WEST, btnSave, 170, SpringLayout.WEST, frame.getContentPane());
springLayout.putConstraint(SpringLayout.SOUTH, btnSave, -10, SpringLayout.SOUTH, frame.getContentPane());
frame.getContentPane().add(btnSave);
}
public void guiSettings() {
/*
* Version: 1.0
*
* Method created.
* This method is used only for settings for GUI and it's components.
* I have setVisibility of frame on true allowing it to be visible and have set size
* of frame on x: 300 y: 300. I have set background of textArea to light gray color and set it's editability
* on false. Since it's made to precisely log every key.
*/
frame.setVisible(true);
frame.setSize(300, 300);
textArea.setBackground(Color.LIGHT_GRAY);
textArea.setEditable(false);
}
public JFrame getFrame() {
//This is one of getters which returns JFrame
return frame;
}
public JTextArea getTextArea() {
//This is one of getters which returns JTextArea
return textArea;
}
public JButton getBtnSave() {
//This is one of getters which returns JButton
return btnSave;
}
public static void main(String[] args) {
/*
* This is main method of the program.
*
* Version: 1.0
*
* I have made KeyGUI object and assigned all methods to it.
*/
KeyGUI keyGUIobj = new KeyGUI();
Logger loggerObj = new Logger();
keyGUIobj.getBtnSave();
keyGUIobj.getFrame();
keyGUIobj.getTextArea();
keyGUIobj.guiLayout();
keyGUIobj.guiSettings();
keyGUIobj.guiListeners();
loggerObj.getE();
}
}
（是的，它是一种个人密钥记录器），反正我也做了Logger类。这将使用KeyListener来检查按下了哪个键：
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class Logger {
KeyGUI keyGUIObject = new KeyGUI();
KeyListener e = new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_ESCAPE:
System.out.println("Esc");
keyGUIObject.getTextArea().append("Esc");
break;
case KeyEvent.VK_F1:
System.out.println("F1");
break;
case KeyEvent.VK_F2:
System.out.println("F2");
break;
case KeyEvent.VK_F3:
System.out.println("F3");
break;
case KeyEvent.VK_F4:
System.out.println("F4");
break;
case KeyEvent.VK_F5:
System.out.print("F5");
break;
case KeyEvent.VK_F6:
System.out.println("F6");
break;
case KeyEvent.VK_F7:
System.out.println("F7");
break;
case KeyEvent.VK_F8:
System.out.println("F8");
break;
case KeyEvent.VK_9:
System.out.println("F9");
break;
case KeyEvent.VK_F10:
System.out.println("F10");
break;
case KeyEvent.VK_F11:
System.out.println("F11");
break;
case KeyEvent.VK_F12:
System.out.println("F12");
break;
case KeyEvent.VK_PRINTSCREEN:
System.out.println("Print Sc");
break;
case KeyEvent.VK_SCROLL_LOCK:
System.out.println("Scr lock");
break;
case KeyEvent.VK_PAUSE:
System.out.println("Pause");
break;
case KeyEvent.VK_INSERT:
System.out.println("Insert");
break;
case KeyEvent.VK_DELETE:
System.out.println("Delete");
break;
case KeyEvent.VK_PAGE_UP:
System.out.println("PgUp");
break;
case KeyEvent.VK_PAGE_DOWN:
System.out.print("PgDown");
break;
case KeyEvent.VK_DEAD_TILDE:
System.out.println("Tilde");
break;
case KeyEvent.VK_1:
System.out.println("1");
}
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
};
public KeyListener getE() {
return e;
}
}
我已经制作了System.out.println("Esc")，以防万一它被解雇了。因为在控制台中它确实显示Esc。所以我想我注册了一些错误。
答案 0 :(得分：1)
你的设计已关闭。
在main（）方法中，您有代码：
KeyGUI keyGUIobj = new KeyGUI();
Logger loggerObj = new Logger();
在Logger类中你有：
KeyGUI keyGUIObject = new KeyGUI();
所以你要创建同一个类的多个实例。
为了简化设计，Logger类应该implement KeyListener接口。然后就不需要getter / setter或访问KeyGUI类。
然后在创建文本区域时在主类中，您只需使用以下代码：
JTextArea textArea = new JTextArea(5, 10);
textArea.addKeyListener( new Logger() );
我建议您查看How to Write a Key Listener上Swing教程中有关工作示例和更好结构化代码的部分。