import beast.core.Loggable; //导入依赖的package包/类
public void log(int sampleNr, double NSlikelihood) {
       if (sampleNr < 0) {
           return;
       }
       if (sampleOffset >= 0) {
           if (sampleNr == 0) {
               // don't need to duplicate the last line in the log
               return;
           }
           sampleNr += sampleOffset;
       }

       ByteArrayOutputStream baos = new ByteArrayOutputStream();
       PrintStream out = new PrintStream(baos);

       if (mode == LOGMODE.compound) {
           out.print((sampleNr) + "\t");
           out.print(NSlikelihood + "\t");
       }

       for (final Loggable m_logger : loggerList) {
           m_logger.log(sampleNr, out);
       }

       // Acquire log string and trim excess tab
       String logContent;
       try {
           logContent = baos.toString("ASCII").trim();
       } catch (UnsupportedEncodingException e) {
           throw new RuntimeException("ASCII string encoding not supported: required for logging!");
       }

       m_out.println(logContent);
}