如何测试混频器中的源线是否为MIC

Question

我想测试一下我从调音台收到的特定源线是否是麦克风。我用代码做了..

            //All lines have been successfully opened in previous code
            Line[] lines = myMixer.getSourceLines();
            int length = lines.length;

             for ( int i = 0; i < length; i ++){
                 // Since all lines are open and supported all I need to do is 
                 // iterate through the array and test each line to see if its
                 // a mic.

                  if(myMixer.isLineSupported(Port.Info.MICROPHONE){ // I need a different method
                  System.out.println("This line never prints");
                  }

             }

除了isLineSupported（）之外，是否有其他方法可以使用，如果我的线路进入麦克风会让我知道？