import java.io.*;

public class ck{
 public static void main(String[] args){
  try{
  
   File read = new File("d://jjjj.txt");
   File write = new File("d://ck.txt");
  
   BufferedReader br = new BufferedReader(
         new FileReader(read));
   BufferedWriter bw = new BufferedWriter(
         new FileWriter(write));
   String temp = null;
   temp = br.readLine();
   while(temp != null){
    //寫檔案
  if(temp.indexOf("JGDM") >0){
     bw.write(temp + "/r/n"); //只適用Windows系統
    
    }
 //繼續讀檔案
     temp = br.readLine();
   }
  
   bw.close();
   br.close();
  
  }catch(FileNotFoundException e){ //檔案未找到
   System.out.println (e);
  }catch(IOException e){
   System.out.println (e);
  }
 }
}