Java JFrame根本不显示
我很清楚这个问题已经出现了很多次,我已经搜索过了,但我找不到解决办法,我正在尝试制作一个Java JFrame根本不显示,java,macos,swing,jframe,Java,Macos,Swing,Jframe,我很清楚这个问题已经出现了很多次,我已经搜索过了,但我找不到解决办法,我正在尝试制作一个JFrame弹出并显示一个按钮,然后播放一些音乐4秒钟,但程序甚至不会显示JFrame 这是主类: package practs; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; public cl
JFrame
弹出并显示一个按钮,然后播放一些音乐4秒钟,但程序甚至不会显示JFrame
这是主类:
package practs;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main {
private static JButton button;
public static void main(String[] args){
Sound s = new Sound("/Users/seb/Documents/workspace(NormalJava)/practs/res/backgroundMusic.wav");
JFrame f = new JFrame("Sound Meister");
f.setFocusable(true);
f.setSize(300,300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button = new JButton("Press to view 4 secs of music");
f.add(button);
button.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent event){
s.play();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
s.stop();
}
}
);
f.setVisible(true);
}
}
package practs;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
public class Sound {
private Clip clip;
public Sound(String fileName) {
// specify the sound to play
// (assuming the sound can be played by the audio system)
// from a wave File
try {
File file = new File(fileName);
if (file.exists()) {
AudioInputStream sound = AudioSystem.getAudioInputStream(file);
// load the sound into memory (a Clip)
clip = AudioSystem.getClip();
clip.open(sound);
}
else {
throw new RuntimeException("Sound: file not found: " + fileName);
}
}
catch (MalformedURLException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Malformed URL: " + e);
}
catch (UnsupportedAudioFileException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Unsupported Audio File: " + e);
}
catch (IOException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Input/Output Error: " + e);
}
catch (LineUnavailableException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Line Unavailable Exception Error: " + e);
}
// play, stop, loop the sound clip
}
public void play(){
clip.setFramePosition(0); // Must always rewind!
clip.start();
}
public void loop(){
clip.loop(Clip.LOOP_CONTINUOUSLY);
}
public void stop(){
clip.stop();
}
}
声音类(如果需要):
package practs;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main {
private static JButton button;
public static void main(String[] args){
Sound s = new Sound("/Users/seb/Documents/workspace(NormalJava)/practs/res/backgroundMusic.wav");
JFrame f = new JFrame("Sound Meister");
f.setFocusable(true);
f.setSize(300,300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button = new JButton("Press to view 4 secs of music");
f.add(button);
button.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent event){
s.play();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
s.stop();
}
}
);
f.setVisible(true);
}
}
package practs;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
public class Sound {
private Clip clip;
public Sound(String fileName) {
// specify the sound to play
// (assuming the sound can be played by the audio system)
// from a wave File
try {
File file = new File(fileName);
if (file.exists()) {
AudioInputStream sound = AudioSystem.getAudioInputStream(file);
// load the sound into memory (a Clip)
clip = AudioSystem.getClip();
clip.open(sound);
}
else {
throw new RuntimeException("Sound: file not found: " + fileName);
}
}
catch (MalformedURLException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Malformed URL: " + e);
}
catch (UnsupportedAudioFileException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Unsupported Audio File: " + e);
}
catch (IOException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Input/Output Error: " + e);
}
catch (LineUnavailableException e) {
e.printStackTrace();
throw new RuntimeException("Sound: Line Unavailable Exception Error: " + e);
}
// play, stop, loop the sound clip
}
public void play(){
clip.setFramePosition(0); // Must always rewind!
clip.start();
}
public void loop(){
clip.loop(Clip.LOOP_CONTINUOUSLY);
}
public void stop(){
clip.stop();
}
}
如果有人能帮我解决这个问题,我将非常高兴。你的代码无法编译<代码>声音应该是
最终的
,因为您在匿名ActionListener
类中引用了它
final Sound s =
修正了这一点,框架应该显示出来。如果仍然没有,那么可能是
newsound()
引发了异常。确保您使用的是一个可以看到控制台输出的开发环境。您的代码不会编译<代码>声音应该是最终的
,因为您在匿名ActionListener
类中引用了它
final Sound s =
修正了这一点,框架应该显示出来。如果仍然没有,那么可能是
newsound()
引发了异常。确保您使用的是一个可以看到控制台输出的开发环境。您的代码不会编译<代码>声音应该是最终的
,因为您在匿名ActionListener
类中引用了它
final Sound s =
修正了这一点,框架应该显示出来。如果仍然没有,那么可能是
newsound()
引发了异常。确保您使用的是一个可以看到控制台输出的开发环境。您的代码不会编译<代码>声音应该是最终的
,因为您在匿名ActionListener
类中引用了它
final Sound s =
修正了这一点,框架应该显示出来。如果仍然没有,那么可能是
newsound()
引发了异常。请确保您使用的是一个可以看到控制台输出的开发环境。在反复操作之后,这似乎是一种情况,即不在事件调度线程的上下文中构建UI会导致某种死锁
基本上,我用main
代码块包装在EventQueue中
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
Sound s = new Sound("/Users/swhitehead/Downloads/checked.wav");
JFrame f = new JFrame("Sound Meister");
f.setFocusable(true);
f.setSize(300, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button = new JButton("Press to view 4 secs of music");
f.add(button);
button.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent event) {
s.play();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
s.stop();
}
}
);
f.setVisible(true);
}
});
}
您应该始终在事件调度线程的上下文中启动UI,有关更多详细信息,请参阅
接下来,该线程.sleep
将导致一些问题,有关更多详细信息,请参阅在反复操作之后,这似乎是其中一种情况,即不在事件调度线程的上下文中构建UI将导致某种死锁
基本上,我用main
代码块包装在EventQueue中
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
Sound s = new Sound("/Users/swhitehead/Downloads/checked.wav");
JFrame f = new JFrame("Sound Meister");
f.setFocusable(true);
f.setSize(300, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button = new JButton("Press to view 4 secs of music");
f.add(button);
button.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent event) {
s.play();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
s.stop();
}
}
);
f.setVisible(true);
}
});
}
您应该始终在事件调度线程的上下文中启动UI,有关更多详细信息,请参阅
接下来,该线程.sleep
将导致一些问题,有关更多详细信息,请参阅在反复操作之后,这似乎是其中一种情况,即不在事件调度线程的上下文中构建UI将导致某种死锁
基本上,我用main
代码块包装在EventQueue中
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
Sound s = new Sound("/Users/swhitehead/Downloads/checked.wav");
JFrame f = new JFrame("Sound Meister");
f.setFocusable(true);
f.setSize(300, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button = new JButton("Press to view 4 secs of music");
f.add(button);
button.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent event) {
s.play();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
s.stop();
}
}
);
f.setVisible(true);
}
});
}
您应该始终在事件调度线程的上下文中启动UI,有关更多详细信息,请参阅
接下来,该线程.sleep
将导致一些问题,有关更多详细信息,请参阅在反复操作之后,这似乎是其中一种情况,即不在事件调度线程的上下文中构建UI将导致某种死锁
基本上,我用main
代码块包装在EventQueue中
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
Sound s = new Sound("/Users/swhitehead/Downloads/checked.wav");
JFrame f = new JFrame("Sound Meister");
f.setFocusable(true);
f.setSize(300, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button = new JButton("Press to view 4 secs of music");
f.add(button);
button.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent event) {
s.play();
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
e.printStackTrace();
}
s.stop();
}
}
);
f.setVisible(true);
}
});
}
您应该始终在事件调度线程的上下文中启动UI,有关更多详细信息,请参阅
接下来,该Thread.sleep
将导致一些问题,有关更多详细信息,请参见ThisThread.sleep(4000)代码>是一个糟糕的开始。查看更多信息details@MadProgrammer即使在我移除线程之后。sleep(显然包括try&catch)并离开s.play();如果没有声音
类,JFrame仍然无法显示自己,它对我来说运行得很好。我在用Java 8,你在用什么…?@MadProgrammer我也在用Java 8,也许我需要重新启动Eclipse。。。我将查看答案,重新启动它不会做任何事情。Thread.sleep(4000)代码>是一个糟糕的开始。查看更多信息details@MadProgrammer即使在我移除线程之后。sleep(显然包括try&catch)并离开s.play();如果没有声音
类,JFrame仍然无法显示自己,它对我来说运行得很好。我在用Java 8,你在用什么…?@MadProgrammer我也在用Java 8,也许我需要重新启动Eclipse。。。我将查看答案,重新启动它不会做任何事情。Thread.sleep(4000)代码>是一个糟糕的开始。查看更多信息details@MadProgrammer即使在我移除线程之后。sleep(显然包括try&catch)并离开s.play();如果没有声音
类,JFrame仍然无法显示自己,它对我来说运行得很好。我在用Java 8,你在用什么…?@MadProgrammer我也在用Java 8,也许我需要重新启动Eclipse。。。我将查看答案,重新启动它不会做任何事情。Thread.sleep(4000)代码>是一个糟糕的开始。查看更多信息details@MadProgrammer即使在我移除线程之后。sleep(显然包括try&catch)并离开s.play();如果没有声音
类,JFrame仍然无法显示自己,它对我来说运行得很好。我在用Java 8,你在用什么…?@MadProgrammer我也在用Java 8,也许我需要重新启动Eclipse。。。我会看看答案,它不会