JFrame组件加载缓慢

Question

我正在为学校的作业制作键盘，我注意到一个我以前从未遇到过的问题。 我的JFrame立即打开，但其中的JPanels，主要是内容窗格，在事后缓慢加载。 这给项目带来了未完成的感觉，我正在寻找修复方法。 它们最终会加载，但我正在寻找一种使框架和面板同时打开的方法。

public class main {
public static JFrame frame;
public static JPanel panel, option, keys;
public static JButton A, B, C, D, E, F, G, A3, C3, D3, F3, G3;
public static AudioInputStream audioInputStream;
public static Clip clip;
public static void start() {
frame = new JFrame("PIANO");
frame.setPreferredSize(new Dimension(700, 500));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
panel = new JPanel();
panel.setOpaque(true);
panel.setLayout(null);
frame.setContentPane(panel);
option = new JPanel();
option.setOpaque(true);
option.setSize(new Dimension(700, 100));
option.setLocation(0, 0);
option.setBackground(Color.GRAY);
panel.add(option);
keys = new JPanel();
keys.setOpaque(true);
keys.setSize(new Dimension(700, 400));
keys.setLocation(0, 100);
keys.setLayout(null);
panel.add(keys);
C3 = new JButton();
C3.setSize(new Dimension(60, 190));
C3.setLocation(70, 0);
C3.setBackground(Color.BLACK);
C3.setOpaque(true);
C3.addActionListener((ActionEvent ae) -> {
try {
audioInputStream = AudioSystem.getAudioInputStream(new File("C_s.wav").getAbsoluteFile());
// create clip reference
clip = AudioSystem.getClip();
// open audioInputStream to the clip
clip.open(audioInputStream);
clip.start();
} catch (UnsupportedAudioFileException | IOException | LineUnavailableException ex) {
Logger.getLogger(main.class.getName()).log(Level.SEVERE, null, ex);
}
});
keys.add(C3);
D3 = new JButton();
D3.setSize(new Dimension(60, 190));
D3.setLocation(170, 0);
D3.setBackground(Color.BLACK);
D3.setOpaque(true);
D3.addActionListener((ActionEvent ae) -> {
try {
audioInputStream = AudioSystem.getAudioInputStream(new File("D_s.wav").getAbsoluteFile());
// create clip reference
clip = AudioSystem.getClip();
// open audioInputStream to the clip
clip.open(audioInputStream);
clip.start();
} catch (UnsupportedAudioFileException | IOException | LineUnavailableException ex) {
Logger.getLogger(main.class.getName()).log(Level.SEVERE, null, ex);
}
});
keys.add(D3);
frame.pack();
frame.setVisible(true);
}
}

Answer 1

我已经找到了该问题的解决方案，尽管我仍然不太确定是什么原因导致它执行缓慢。 一旦我向另一个 JPanel 选项中添加了一个组件，我的程序就会完全按照我想要的方式运行。 它并没有像现在这样停滞不前。

public class main {
public static JFrame frame;
public static JPanel panel, option, keys;
public static JButton A, B, C, D, E, F, G, A3, C3, D3, F3, G3;
public static AudioInputStream audioInputStream;
public static Clip clip;
public static boolean octave1, octave2;
public static void start() {
frame = new JFrame("PIANO");
frame.setPreferredSize(new Dimension(700, 500));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
panel = new JPanel();
panel.setOpaque(true);
panel.setLayout(null);
frame.setContentPane(panel);
option = new JPanel();
option.setOpaque(true);
option.setSize(new Dimension(700, 100));
option.setLocation(0, 0);
option.setBackground(Color.GRAY);
panel.add(option);
//ADDED NEW
oct1 = new JRadioButton("Low Octave");
oct1.setSelected(true);
oct1.addActionListener((ActionEvent ae) -> {
oct2.setSelected(false);
octave1 = true;
octave2 = false;
});
option.add(oct1);
oct2 = new JRadioButton("High Octave");
oct2.addActionListener((ActionEvent ae) -> {
oct1.setSelected(false);
octave1 = false;
octave2 = true;
});
//END OF NEW
keys = new JPanel();
keys.setOpaque(true);
keys.setSize(new Dimension(700, 400));
keys.setLocation(0, 100);
keys.setLayout(null);
panel.add(keys);
C3 = new JButton();
C3.setSize(new Dimension(60, 190));
C3.setLocation(70, 0);
C3.setBackground(Color.BLACK);
C3.setOpaque(true);
C3.addActionListener((ActionEvent ae) -> {
try {
audioInputStream = AudioSystem.getAudioInputStream(new File("C_s.wav").getAbsoluteFile());
// create clip reference
clip = AudioSystem.getClip();
// open audioInputStream to the clip
clip.open(audioInputStream);
clip.start();
} catch (UnsupportedAudioFileException | IOException | LineUnavailableException ex) {
Logger.getLogger(main.class.getName()).log(Level.SEVERE, null, ex);
}
});
keys.add(C3);
D3 = new JButton();
D3.setSize(new Dimension(60, 190));
D3.setLocation(170, 0);
D3.setBackground(Color.BLACK);
D3.setOpaque(true);
D3.addActionListener((ActionEvent ae) -> {
try {
audioInputStream = AudioSystem.getAudioInputStream(new File("D_s.wav").getAbsoluteFile());
// create clip reference
clip = AudioSystem.getClip();
// open audioInputStream to the clip
clip.open(audioInputStream);
clip.start();
} catch (UnsupportedAudioFileException | IOException | LineUnavailableException ex) {
Logger.getLogger(main.class.getName()).log(Level.SEVERE, null, ex);
}
});
keys.add(D3);
frame.pack();
frame.setVisible(true);
}
}

Answer 2

您应该始终将线程用于繁重的任务，例如加载文件或从数据库读取，以便它们可以在后台运行而不会影响您的 GUI。我希望这可以帮助您：

new Runnable() {
@Override
public void run() {
C3.addActionListener((ActionEvent ae) -> {
try {
audioInputStream = AudioSystem.getAudioInputStream(new File("C_s.wav").getAbsoluteFile());
// create clip reference
clip = AudioSystem.getClip();
// open audioInputStream to the clip
clip.open(audioInputStream);
clip.start();
} catch (UnsupportedAudioFileException | IOException | LineUnavailableException ex) {
ex.printStackTrace();
//Logger.getLogger(main.class.getName()).log(Level.SEVERE, null, ex);
}
});
}
}.run();
//You can leave your listeners on the same lines as your the example
new Runnable() {
@Override
public void run() {
D3.addActionListener((ActionEvent ae) -> {
try {
audioInputStream = AudioSystem.getAudioInputStream(new File("D_s.wav").getAbsoluteFile());
// create clip reference
clip = AudioSystem.getClip();
// open audioInputStream to the clip
clip.open(audioInputStream);
clip.start();
} catch (UnsupportedAudioFileException | IOException | LineUnavailableException ex) {
ex.printStackTrace();
//Logger.getLogger(main.class.getName()).log(Level.SEVERE, null, ex);
}
});
}
}.run();