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所以，嘿，我一直试图通过java设计一架钢琴，net-beans用于我在uni的最终项目。这里的东西是每件事情都很好，但我在这里有焦点问题。例如，我试图通过键盘弹奏琴键，我想让钢琴琴键专注于指定的琴键，并指定了关于如何操作琴键的任何想法？非常感激。这是我的第一个问题，所以我不确定我是否在这里问正确的事情。如何在按下键盘按键时更改焦点不同的J按钮？
我要提供我正在使用的示例。
package javaapplication5;
import sun.audio.*;
import java.io.*;
import javax.swing.JOptionPane;
public class NewJFrame1 extends javax.swing.JFrame {
public NewJFrame1() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("A");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton1.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(java.awt.event.FocusEvent evt) {
jButton1FocusGained(evt);
}
});
jButton1.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
jButton1KeyPressed(evt);
}
public void keyReleased(java.awt.event.KeyEvent evt) {
jButton1KeyReleased(evt);
}
});
jButton2.setText("B");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton2.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
jButton2KeyPressed(evt);
}
});
jButton3.setText("C");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jButton3.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
jButton3KeyPressed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(89, 89, 89)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(123, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(91, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 106, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 105, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(110, 110, 110))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(45, 45, 45)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(190, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(51, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
InputStream iAudio;
try{
iAudio = new FileInputStream(new File("C:\\Users\\MohammedRishad\\Desktop\\Audios\\A.wav"));
AudioStream iMusic = new AudioStream(iAudio);
AudioPlayer.player.start(iMusic);
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
InputStream iAudio;
try{
iAudio = new FileInputStream(new File("C:\\Users\\MohammedRishad\\Desktop\\Audios\\B.wav"));
AudioStream iMusic = new AudioStream(iAudio);
AudioPlayer.player.start(iMusic);
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
InputStream iAudio;
try{
iAudio = new FileInputStream(new File("C:\\Users\\MohammedRishad\\Desktop\\Audios\\C.wav"));
AudioStream iMusic = new AudioStream(iAudio);
AudioPlayer.player.start(iMusic);
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
private void jButton1KeyPressed(java.awt.event.KeyEvent evt) {
if(evt.getKeyChar()=='z'){
InputStream iAudio;
try{
iAudio = new FileInputStream(new File("C:\\Users\\MohammedRishad\\Desktop\\Audios\\A.wav"));
AudioStream iMusic = new AudioStream(iAudio);
AudioPlayer.player.start(iMusic);
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
}
private void jButton2KeyPressed(java.awt.event.KeyEvent evt) {
if(evt.getKeyChar()=='x'){
InputStream iAudio;
try{
iAudio = new FileInputStream(new File("C:\\Users\\MohammedRishad\\Desktop\\Audios\\B.wav"));
AudioStream iMusic = new AudioStream(iAudio);
AudioPlayer.player.start(iMusic);
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
}
private void jButton3KeyPressed(java.awt.event.KeyEvent evt) {
if(evt.getKeyChar()=='c'){
InputStream iAudio;
try{
iAudio = new FileInputStream(new File("C:\\Users\\MohammedRishad\\Desktop\\Audios\\C.wav"));
AudioStream iMusic = new AudioStream(iAudio);
AudioPlayer.player.start(iMusic);
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame1().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}
由于这是我只有3个按键在这里工作的样本。我想获得所有帮助，我可以提前感谢
你到底要达到什么样的按钮也可以改变对焦按钮？你期望的行为是什么？ – XtremeBaumer