Mixer.Info[] infos = AudioSystem.getMixerInfo(); 
                	
for (Mixer.Info info: infos)  
{  
    Mixer mixer = AudioSystem.getMixer(info);  
    if (mixer.isLineSupported(Port.Info.SPEAKER))  
    {  
        Port port = (Port)mixer.getLine(Port.Info.SPEAKER);  
        port.open();  
        if (port.isControlSupported(FloatControl.Type.VOLUME))  
        {  
            FloatControl volume = (FloatControl)port.getControl(FloatControl.Type.VOLUME);
            volume.setValue(volume.getValue() - volume.getValue());
                                
            System.out.println(info);  
            System.out.println("- " + Port.Info.SPEAKER);  
            System.out.println("  - " + volume);  
        }  
        port.close();  
    }  
}