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3. ¸´ÖÆ javax.comm.properties µ½ C:\java142\jre\lib£¬javax.comm.properties Ò»¶¨Òª°²×°£¬·ñÔò£¬ÎÒÃǽ«ÕÒ²»µ½ÏµÍ³ÖеÄÈκβ¢Ðж˿ڡ£
 
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---------- BEGIN SOURCE ----------
import java.io.*;
import java.util.*;
import javax.comm.*;
public class SimpleLPTPort  {
       Enumeration ports;
       CommPortIdentifier portId;
      
       ParallelPort LPTPort;
      
    protected OutputStream out;
   
    String outPrintStr = "When an \n\rinput method \n\ris activated, ";
       public SimpleLPTPort() {
              checkLPTPort();
       }
      
       public void checkLPTPort() {
             
              ports = CommPortIdentifier.getPort


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