import java.io.*;
public class FileRadAccess{
public static void main(String args[]){
String readStr,tempStr;
int fileLine=0;
    long pointerLast1=0,pointerLast2=0;
	try{
	      RandomAccessFile f1 = new RandomAccessFile("e:/example.txt","rw");
	      while(f1.readLine()!=null)
	              fileLine++;
	       pointerLast1 = f1.getFilePointer();
	       for(int i=0;i<fileLine;i++){
	            f1.seek(4*i);
	            readStr = f1.readLine();
	            System.out.println(readStr);
}
	  }catch(IOException e){}
	  try{
	        RandomAccessFile f2 = new RandomAccessFile("e:/example.txt","rw");
	        byte buf[] = new byte[1024];
	        String writeStr = new String("***************************");
	        f2.seek(pointerLast1);
	        f2.writeBytes("\r\n"+writeStr+"\r\n");
	        f2.seek(0);
	        f2.readLine();
	        f2.readLine();
	        pointerLast2 = f2.getFilePointer();
	        f2.read(buf);
	        tempStr = new String(buf);
	        f2.seek(pointerLast2);
	        f2.writeBytes(writeStr+"\r\n");
	        f2.writeBytes(tempStr);
	  }catch(IOException e){}
}
}
