尝试播放声音时出现错误。由于某种原因,我得到了一个空指针异常。我使用的位置和文件都存在,并且在输出文件字符串时,我确实得到了文件的正确路径。空指针位于 .open 行上。我究竟做错了什么?
package main;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
public class Sound {
Clip background;
public void init() {
try {
String file = new File("").getAbsolutePath() + "\\Sounds\\Pacman_Opening.wav";
System.out.println(file);
background = AudioSystem.getClip();
background.open(AudioSystem.getAudioInputStream(getClass().getResource(file)));
} catch (LineUnavailableException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedAudioFileException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void playBG() {
background.start();
}
public void stopBG() {
background.stop();
}
public static void main(String[] args) {
Sound s = new Sound();
s.init();
s.playBG();
}
}
这是错误(第一行是位置):
Exception in thread "main" java.lang.NullPointerException
at com.sun.media.sound.WaveFileReader.getAudioInputStream(Unknown Source)
at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
at main.Sound.init(Sound.java:21)
at main.Sound.main(Sound.java:42)