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ComputerCount.java
package tom.jiafei;
import java.io.*;
public class ComputerCount{
  int number=0;
  boolean iscome=false;
  File file=new File("Count.dat");
  private void countpeople(){
  if(!file.exists())
  {
  number++;
  try{
  file.createNewFile();
  FileOutputStream out=new FileOutputStream(file);
  DataOutputStream dataOut=new DataOutputStream(out);
  dataOut.writeInt(number);
  out.close();
  dataOut.close();
  }
  catch(IOException ee){}
  }
  else
  { try{ FileInputStream in=new FileInputStream(file);
  DataInputStream dataIn=new DataInputStream(in);
  number=dataIn.readInt();
  number++;
  in.close();
  dataIn.close();
  FileOutputStream out=new FileOutputStream(file);
  DataOutputStream dataOut=new DataOutputStream(out);
  dataOut.writeInt(number);
  out.close();
  dataOut.close();
  }
  catch(IOException ee){}
  }
  iscome=true;
  }
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