您好，我需要一些帮助，找出我的计划正在发生什么。它应该在按钮上有一个字母组，上面有一个字母图标，但没有任何东西出现。 所有按钮都显示没有他们的照片，这就是我试图获取图像的方式。
JPanel firstPanel = new JPanel(); // hold 8 letters
firstPanel.setBackground(Color.white);
aButton = new JButton(new ImageIcon("images\\a.gif"));
firstPanel.add(aButton);
在我的src文件夹中有另一个文件夹名称图像和一个名为a.gif
的gif这就是显示的内容。
In those boxes on the bottom is where letters are supposed to be stored
编辑：我认为我应该添加其余的代码，但它很大。
/******************************************************************************* **
* Panel class creates all the buttons for the game including
* start, stop, next game, and 26 alphabet letters
* This class also has methods to listen to mouse and keyboard.
*
******************************************************************************* **/
import java.text.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.net.*;
import java.io.*;
import java.applet.*;
class LearningPanel extends JPanel implements ActionListener {
long totalLetters;
int rightButton = 0,
wrongButton = 0;
String player;
public LearningLetterPanel lp;
private JTextArea letterTextArea;
private JTextField rightButtonTextField,
wrongButtonTextField;
private JLabel rightClickLabel,
wrongClickLabel;
private JButton aButton,
bButton,
cButton,
dButton,
eButton,
fButton,
gButton,
hButton,
iButton,
jButton,
kButton,
lButton,
mButton,
nButton,
oButton,
pButton,
qButton,
rButton,
sButton,
tButton,
uButton,
vButton,
wButton,
xButton,
yButton,
zButton,
startButton,
scoreButton,
quitButton,
stopGameButton;
private AudioClip audioClip;
URL audioUrl;
public LearningPanel(String player) {
ImageIcon playIcon;
ImageIcon stopIcon;
this.player = player;
this.setLayout(new BorderLayout());
// start, next game, quit button
JPanel buttonPanel = new JPanel();
buttonPanel.setBackground(Color.white);
buttonPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
playIcon = new ImageIcon("images\\play.gif");
startButton = new JButton("Start", playIcon);
startButton.addActionListener(this);
buttonPanel.add(startButton);
stopIcon = new ImageIcon("images\\stop.gif");
stopGameButton = new JButton("Stop", stopIcon);
stopGameButton.addActionListener(this);
buttonPanel.add(stopGameButton);
quitButton = new JButton( "Quit",new ImageIcon("images\\Shutdown.gif"));
quitButton.addActionListener(this);
buttonPanel.add(quitButton);
JPanel scorePanel = new JPanel();
scorePanel.setBackground(Color.white);
scorePanel.setLayout(new FlowLayout(FlowLayout.CENTER));
buttonPanel.add(scorePanel);
rightClickLabel = new JLabel("Right: ");
scorePanel.add(rightClickLabel);
rightButtonTextField = new JTextField(3);
rightButtonTextField.setEditable(false);
rightButtonTextField.setFocusable(false);
scorePanel.add(rightButtonTextField);
wrongClickLabel = new JLabel("Wrong: ");
scorePanel.add(wrongClickLabel);
wrongButtonTextField = new JTextField(3);
wrongButtonTextField.setEditable(false);
wrongButtonTextField.setFocusable(false);
scorePanel.add(wrongButtonTextField);
this.add(buttonPanel, BorderLayout.NORTH);
// letters panel display 26 letters
JPanel lettersPanel = new JPanel();
lettersPanel.setBackground(Color.white);
lettersPanel.setLayout(new BorderLayout());
JPanel firstPanel = new JPanel(); // hold 8 letters
firstPanel.setBackground(Color.white);
JPanel secondPanel = new JPanel(); // hold 9 letters
secondPanel.setBackground(Color.white);
JPanel thirdPanel = new JPanel(); // hold 9 letters
thirdPanel.setBackground(Color.white);
aButton = new JButton(new ImageIcon("images\\a.gif"));
bButton = new JButton(new ImageIcon("images\\b.gif"));
cButton = new JButton(new ImageIcon("images\\c.gif"));
dButton = new JButton(new ImageIcon("images\\d.gif"));
eButton = new JButton(new ImageIcon("images\\e.gif"));
fButton = new JButton(new ImageIcon("images/f.gif"));
gButton = new JButton(new ImageIcon("images/g.gif"));
hButton = new JButton(new ImageIcon("images/h.gif"));
iButton = new JButton(new ImageIcon("images/i.gif"));
jButton = new JButton(new ImageIcon("images/j.gif"));
kButton = new JButton(new ImageIcon("images/k.gif"));
lButton = new JButton(new ImageIcon("images/l.gif"));
mButton = new JButton(new ImageIcon("images/m.gif"));
nButton = new JButton(new ImageIcon("images/n.gif"));
oButton = new JButton(new ImageIcon("images/o.gif"));
pButton = new JButton(new ImageIcon("images/p.gif"));
qButton = new JButton(new ImageIcon("images/q.gif"));
rButton = new JButton(new ImageIcon("images/r.gif"));
sButton = new JButton(new ImageIcon("images/s.gif"));
tButton = new JButton(new ImageIcon("images/t.gif"));
uButton = new JButton(new ImageIcon("images/u.gif"));
vButton = new JButton(new ImageIcon("images/v.gif"));
wButton = new JButton(new ImageIcon("images/w.gif"));
xButton = new JButton(new ImageIcon("images/x.gif"));
yButton = new JButton(new ImageIcon("images/y.gif"));
zButton = new JButton(new ImageIcon("images/z.gif"));
firstPanel.add(aButton);
firstPanel.add(bButton);
firstPanel.add(cButton);
firstPanel.add(dButton);
firstPanel.add(eButton);
firstPanel.add(fButton);
firstPanel.add(gButton);
firstPanel.add(hButton);
secondPanel.add(iButton);
secondPanel.add(jButton);
secondPanel.add(kButton);
secondPanel.add(lButton);
secondPanel.add(mButton);
secondPanel.add(nButton);
secondPanel.add(oButton);
secondPanel.add(pButton);
secondPanel.add(qButton);
thirdPanel.add(rButton);
thirdPanel.add(sButton);
thirdPanel.add(tButton);
thirdPanel.add(uButton);
thirdPanel.add(vButton);
thirdPanel.add(wButton);
thirdPanel.add(xButton);
thirdPanel.add(yButton);
thirdPanel.add(zButton);
lettersPanel.add(firstPanel, BorderLayout.NORTH);
lettersPanel.add(secondPanel, BorderLayout.CENTER);
lettersPanel.add(thirdPanel, BorderLayout.SOUTH);
//change the size of the alphabet Letters and stopGameButton
aButton.setPreferredSize(new java.awt.Dimension(50, 50));
bButton.setPreferredSize(new java.awt.Dimension(50, 50));
cButton.setPreferredSize(new java.awt.Dimension(50, 50));
dButton.setPreferredSize(new java.awt.Dimension(50, 50));
eButton.setPreferredSize(new java.awt.Dimension(50, 50));
fButton.setPreferredSize(new java.awt.Dimension(50, 50));
gButton.setPreferredSize(new java.awt.Dimension(50, 50));
hButton.setPreferredSize(new java.awt.Dimension(50, 50));
iButton.setPreferredSize(new java.awt.Dimension(50, 50));
jButton.setPreferredSize(new java.awt.Dimension(50, 50));
kButton.setPreferredSize(new java.awt.Dimension(50, 50));
lButton.setPreferredSize(new java.awt.Dimension(50, 50));
mButton.setPreferredSize(new java.awt.Dimension(50, 50));
nButton.setPreferredSize(new java.awt.Dimension(50, 50));
oButton.setPreferredSize(new java.awt.Dimension(50, 50));
pButton.setPreferredSize(new java.awt.Dimension(50, 50));
qButton.setPreferredSize(new java.awt.Dimension(50, 50));
rButton.setPreferredSize(new java.awt.Dimension(50, 50));
sButton.setPreferredSize(new java.awt.Dimension(50, 50));
tButton.setPreferredSize(new java.awt.Dimension(50, 50));
uButton.setPreferredSize(new java.awt.Dimension(50, 50));
vButton.setPreferredSize(new java.awt.Dimension(50, 50));
wButton.setPreferredSize(new java.awt.Dimension(50, 50));
xButton.setPreferredSize(new java.awt.Dimension(50, 50));
yButton.setPreferredSize(new java.awt.Dimension(50, 50));
zButton.setPreferredSize(new java.awt.Dimension(50, 50));
stopGameButton.setPreferredSize(new java.awt.Dimension(120, 40));
// add listener to the buttons
this.add(lettersPanel, BorderLayout.SOUTH);
aButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "A"); // compare dropping letter with button leter
}
}
);
bButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "B");
}
}
);
cButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "C");
}
}
);
dButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "D"); // compare dropping letter with button leter
}
}
);
eButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "E");
}
}
);
fButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "F");
}
}
);
gButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "G"); // compare dropping letter with button leter
}
}
);
hButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "H");
}
}
);
iButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "I");
}
}
);
jButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "J"); // compare dropping letter with button
}
}
);
kButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "K");
}
}
);
lButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "L");
}
}
);
mButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "M");
}
}
);
nButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "N"); // compare dropping letter with button leter
}
}
);
oButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "O");
}
}
);
pButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "P");
}
}
);
qButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "Q"); // compare dropping letter with button leter
}
}
);
rButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "R");
}
}
);
sButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "S");
}
}
);
tButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "t"); // compare dropping letter with button leter
}
}
);
uButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "U");
}
}
);
vButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "V");
}
}
);
wButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter(); // get random dropping letter
matchingLetter(rl, "W"); // compare dropping letter with button leter
}
}
);
xButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "X");
}
}
);
yButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "Y");
}
}
);
zButton.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String rl = lp.getLetter();
matchingLetter(rl, "Z");
}
}
);
// add keyboard Listeners for each button through keyStup function
keySetup(aButton);
keySetup(bButton);
keySetup(cButton);
keySetup(dButton);
keySetup(eButton);
keySetup(fButton);
keySetup(gButton);
keySetup(hButton);
keySetup(iButton);
keySetup(jButton);
keySetup(kButton);
keySetup(lButton);
keySetup(mButton);
keySetup(nButton);
keySetup(oButton);
keySetup(pButton);
keySetup(qButton);
keySetup(rButton);
keySetup(sButton);
keySetup(tButton);
keySetup(uButton);
keySetup(vButton);
keySetup(wButton);
keySetup(xButton);
keySetup(yButton);
keySetup(zButton);
keySetup(startButton);
keySetup(quitButton);
// display panel will display dropping letter or photos of alphabets....
JPanel displayPanel = new JPanel();
displayPanel.setBackground(Color.white);
displayPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
// letter text field
letterTextArea = new JTextArea(300,40);
letterTextArea.setBackground(Color.white);
letterTextArea.disable();
displayPanel.add(letterTextArea);
this.add(displayPanel, BorderLayout.CENTER);
}
/*
method: matchingLetter
purpose: compare dropping letter and button letter that the user selected
display message when matching or mismatch
*/
public void matchingLetter(String droppingLetter, String buttonLetter) {
if(droppingLetter.equalsIgnoreCase(buttonLetter)) {
//PlaySound ps = new PlaySound("sounds/backgroundmusic.au");
//PlaySound ps = new PlaySound("sounds/cheer.wav");
try {
audioUrl=new URL("file:" + new File(".").getCanonicalPath()
+ "//sounds\\cheer.wav");
audioClip=Applet.newAudioClip(audioUrl);
audioClip.play();
}catch(Exception e){
System.out.println(e.toString());
}
JOptionPane.showMessageDialog(null, "You got It");
rightButton += 1;
rightButtonTextField.setText(Integer.toString(rightButton));
Object source = startButton;
}
else {
//PlaySound ps = new PlaySound("sounds/error.wav");
try {
audioUrl=new URL("file:" + new File(".").getCanonicalPath()
+ "//sounds//error.wav");
audioClip=Applet.newAudioClip(audioUrl);
audioClip.play();
}catch(Exception e){
System.out.println(e.toString());
}
JOptionPane.showMessageDialog(null, "Wrong Letter");
wrongButton += 1;
wrongButtonTextField.setText(Integer.toString(wrongButton));
}
}
/*
method: ActionPerformed
purpose: listen to buttons
*/
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == quitButton) {
System.exit(0);
}
else if (source == stopGameButton) {
lp.stop();
JOptionPane.showMessageDialog(null, "Thank you " + player + " for playing this game. Your Score is "
+ rightButton + " right and " + wrongButton + " wrong out of "
+ LearningLetterPanel.nLetterDropped + " letters");
LearningLetterPanel.nLetterDropped = 0;
rightButton = 0;
wrongButton = 0;
rightButtonTextField.setText(Integer.toString(rightButton));
wrongButtonTextField.setText(Integer.toString(wrongButton));
}
/****************************************************
* Start the game and resets the buttons to 0
*
*****************************************************/
else if (source == startButton) {
rightButton = 0;
wrongButton = 0;
rightButtonTextField.setText(Integer.toString(rightButton));
wrongButtonTextField.setText(Integer.toString(wrongButton));
lp = new LearningLetterPanel();
JPanel displayPanel = lp;
displayPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
this.add(displayPanel, BorderLayout.CENTER);
Font f = new Font("SansSerif", Font.BOLD, 48);
letterTextArea.setFont(f);
}
}
/***************************************************************************************
* Assign the <code> Component</code> keyListener to call matchLetter() with the associated letter
* @param <code> Component </code> for any Component in the GamePanel
************************************************************************************/
public void keySetup(Component theCandidate){
theCandidate.addKeyListener( new KeyAdapter() {
public void keyPressed( KeyEvent ke ) {
if (ke.getKeyCode()==ke.VK_A){matchingLetter(lp.getLetter(), "A");}
else if (ke.getKeyCode()==ke.VK_B){matchingLetter(lp.getLetter(), "B");}
else if (ke.getKeyCode()==ke.VK_C){matchingLetter(lp.getLetter(), "C");}
else if (ke.getKeyCode()==ke.VK_D){matchingLetter(lp.getLetter(), "D");}
else if (ke.getKeyCode()==ke.VK_E){matchingLetter(lp.getLetter(), "E");}
else if (ke.getKeyCode()==ke.VK_F){matchingLetter(lp.getLetter(), "F");}
else if (ke.getKeyCode()==ke.VK_G){matchingLetter(lp.getLetter(), "G");}
else if (ke.getKeyCode()==ke.VK_H){matchingLetter(lp.getLetter(), "H");}
else if (ke.getKeyCode()==ke.VK_I){matchingLetter(lp.getLetter(), "I");}
else if (ke.getKeyCode()==ke.VK_J){matchingLetter(lp.getLetter(), "J");}
else if (ke.getKeyCode()==ke.VK_K){matchingLetter(lp.getLetter(), "K");}
else if (ke.getKeyCode()==ke.VK_L){matchingLetter(lp.getLetter(), "L");}
else if (ke.getKeyCode()==ke.VK_M){matchingLetter(lp.getLetter(), "M");}
else if (ke.getKeyCode()==ke.VK_N){matchingLetter(lp.getLetter(), "N");}
else if (ke.getKeyCode()==ke.VK_O){matchingLetter(lp.getLetter(), "O");}
else if (ke.getKeyCode()==ke.VK_P){matchingLetter(lp.getLetter(), "P");}
else if (ke.getKeyCode()==ke.VK_Q){matchingLetter(lp.getLetter(), "Q");}
else if (ke.getKeyCode()==ke.VK_R){matchingLetter(lp.getLetter(), "R");}
else if (ke.getKeyCode()==ke.VK_S){matchingLetter(lp.getLetter(), "S");}
else if (ke.getKeyCode()==ke.VK_T){matchingLetter(lp.getLetter(), "T");}
else if (ke.getKeyCode()==ke.VK_U){matchingLetter(lp.getLetter(), "U");}
else if (ke.getKeyCode()==ke.VK_V){matchingLetter(lp.getLetter(), "V");}
else if (ke.getKeyCode()==ke.VK_W){matchingLetter(lp.getLetter(), "W");}
else if (ke.getKeyCode()==ke.VK_X){matchingLetter(lp.getLetter(), "X");}
else if (ke.getKeyCode()==ke.VK_Y){matchingLetter(lp.getLetter(), "Y");}
else if (ke.getKeyCode()==ke.VK_Z){matchingLetter(lp.getLetter(), "Z");};
};
} );
}
}