Add all the necessary exception declarations to remove the compile-time errors import java.io.*; public class L9 {public static String cat(String fileName) {FilelnputStream fin = new FileInputStream(fileName); BufferedReader input = new BufferedReader(new InputStreamReader(fin)); StringBuffer buffer = new StringBuffer(); String line = null; while ((line = input.readLine()) != null) {line = line.replaceAll("\\s+", " "); buffer.append(line);} fin.close(); return buffer.toString();}//End of cat public static void main(String[] args) {}}