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[CODE]import java.io.*;public class Ex9a{ public void rollBack(BufferedReader in) throws IOException{ String line=""; if((line=in.readLine())!=null){ rollBack(in); } if(line!=null&&!"".equals(line)){ System.out.println(line); } } public static void main(String[] args) throws FileNotFoundException{ PrintStream out; Ex9a t=new Ex9a(); out = new PrintStream(new FileOutputStream("outfile.txt")); out.println(ioe); out.close( ); String fileName="infile.txt"; try{ BufferedReader in=new BufferedReader(new FileReader(fileName)); t.rollBack(in); }catch(IOException ioe){ System.out.println(ioe); …
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