Java javax.sound.sampled Interface Line（JDK8）

Method Detail

• getLineInfo

  Line.Info getLineInfo()

  Obtains the Line.Info object describing this line.

  Returns:

  description of the line

• open

  void open()
     throws LineUnavailableException

  Opens the line, indicating that it should acquire any required system resources and become operational. If this operation succeeds, the line is marked as open, and an OPEN event is dispatched to the line's listeners.

  Note that some lines, once closed, cannot be reopened. Attempts to reopen such a line will always result in an LineUnavailableException.

  Some types of lines have configurable properties that may affect resource allocation. For example, a DataLine must be opened with a particular format and buffer size. Such lines should provide a mechanism for configuring these properties, such as an additional open method or methods which allow an application to specify the desired settings.

  This method takes no arguments, and opens the line with the current settings. For SourceDataLine and TargetDataLine objects, this means that the line is opened with default settings. For a Clip, however, the buffer size is determined when data is loaded. Since this method does not allow the application to specify any data to load, an IllegalArgumentException is thrown. Therefore, you should instead use one of the open methods provided in the Clip interface to load data into the Clip.

  For DataLine's, if the DataLine.Info object which was used to retrieve the line, specifies at least one fully qualified audio format, the last one will be used as the default format.

  Throws:

  IllegalArgumentException - if this method is called on a Clip instance.

  LineUnavailableException - if the line cannot be opened due to resource restrictions.

  SecurityException - if the line cannot be opened due to security restrictions.

  See Also:

  close(), isOpen(), LineEvent, DataLine, Clip.open(AudioFormat, byte[], int, int), Clip.open(AudioInputStream)

• close

  void close()

  Closes the line, indicating that any system resources in use by the line can be released. If this operation succeeds, the line is marked closed and a CLOSE event is dispatched to the line's listeners.

  Specified by:

  close in interface AutoCloseable

  Throws:

  SecurityException - if the line cannot be closed due to security restrictions.

  See Also:

  open(), isOpen(), LineEvent

• isOpen

  boolean isOpen()

  Indicates whether the line is open, meaning that it has reserved system resources and is operational, although it might not currently be playing or capturing sound.

  Returns:

  true if the line is open, otherwise false

  See Also:

  open(), close()

• getControls

  Control[] getControls()

  Obtains the set of controls associated with this line. Some controls may only be available when the line is open. If there are no controls, this method returns an array of length 0.

  Returns:

  the array of controls

  See Also:

  getControl(javax.sound.sampled.Control.Type)

• isControlSupported

  boolean isControlSupported(Control.Type control)

  Indicates whether the line supports a control of the specified type. Some controls may only be available when the line is open.

  Parameters:

  control - the type of the control for which support is queried

  Returns:

  true if at least one control of the specified type is supported, otherwise false.

• getControl

  Control getControl(Control.Type control)

  Obtains a control of the specified type, if there is any. Some controls may only be available when the line is open.

  Parameters:

  control - the type of the requested control

  Returns:

  a control of the specified type

  Throws:

  IllegalArgumentException - if a control of the specified type is not supported

  See Also:

  getControls(), isControlSupported(Control.Type control)

• addLineListener

  void addLineListener(LineListener listener)

  Adds a listener to this line. Whenever the line's status changes, the listener's update() method is called with a LineEvent object that describes the change.

  Parameters:

  listener - the object to add as a listener to this line

  See Also:

  removeLineListener(javax.sound.sampled.LineListener), LineListener.update(javax.sound.sampled.LineEvent), LineEvent

• removeLineListener

  void removeLineListener(LineListener listener)

  Removes the specified listener from this line's list of listeners.

  Parameters:

  listener - listener to remove

  See Also:

  addLineListener(javax.sound.sampled.LineListener)