code: public final void release()
                      throws java.io.IOException {
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this,
                          cclass,
                          "release");
  
          // Give up the lock.
          if (fileLock != null)
              fileLock.release();
          fileLock = null;
  
          if (fileChannel != null)
              fileChannel.close();
          fileChannel = null;
  
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this,
                         cclass,
                         "release");
      }
docs: Unlock the file.
  
  @throws java.io.IOException