//package CheckWriter;

//import com.sun.tools.javac.comp.Check;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.text.DecimalFormat;

import java.lang.*;

public class CheckWriter {

//Varibles

String payName;

String date;

double amount1;

String amount2;

private static final String[] payNames = {"", "ten", "twenty", "thirty", "forty", "fifty",

"sixty", "seventy", "eighty", "ninety"};

private static final String[] numNames = {"", "one", "two", "three", "four", "five", "six",

"seven", "eight", "nine", "ten", "eleven", "twelve",

"thirteen", "fourteen", "fifteen", "sixteen", "seventeen",

"eighteen", "nineteen"};

private static String converts(int num){

String give;

if(num % 100 < 20){

give = numNames[num % 100];

num = num / 100;

}else{

give = numNames[num % 10];

num = num / 10;

give = payNames[num % 10] + give;

num = num / 10;

}//end if

if(num == 0){

return give;

}//end if

return numNames[num] + " hundred" + give;

}

public static String convert(long num){

String number = Long.toString(num);

String mask = "000000000000";

int billions = Integer.parseInt(number.substring(0, 3));

int millions = Integer.parseInt(number.substring(3, 6));

int thousands = Integer.parseInt(number.substring(9, 12));

int hundredthousands = Integer.parseInt(number.substring(6, 9));

String conBillions;

if(num == 0){

return "zero";

}

DecimalFormat df = new DecimalFormat(mask);

number = df.format(num);

switch(billions){

case 0:

conBillions = "";

break;

case 1:

conBillions = converts(billions) + " billion ";

break;

default:

conBillions = converts(billions) + " billion ";

break;

}//end

String result = conBillions;

String conMillions;

switch(millions){

case 0:

conMillions = "";

break;

case 1:

conMillions = converts(millions) + " millions ";

break;

case 2:

conMillions = converts(millions) + " millions ";

break;

default:

conMillions = converts(millions) + " millions";

break;

}//end

result += conMillions;

String conHundredThousands;

switch(hundredthousands){

case 0:

conHundredThousands = "";

break;

case 1:

conHundredThousands = "one thousand ";

break;

default:

conHundredThousands = converts(hundredthousands) + " thousand ";

}//end

result += conHundredThousands;

String conThousands;

conThousands = converts(thousands);

result += conThousands;

return result.replaceAll("^\\s+", "").replaceAll("\\b\\s{2,}\\b", " ");

}//end method

private void displayString(){

System.out.println("--------------------------------------------------------------------------");

System.out.println(" Date: " + date);

System.out.println(" Pay to the order of: " + payName + "\t\t\t\t $" + amount1);

System.out.println(" \t\t\t\t\t\t\t");

System.out.println(" " + amount2);

System.out.println(" \t\t\t\t\t\t\t");

System.out.println("--------------------------------------------------------------------------");

}//end

private void convertString(){

DecimalFormat df = new DecimalFormat("0.##");

String str = Double.toString((amount1));

int length = str.length();

long dollars = Long.parseLong(str.substring(0, length-3));

int cents = Integer.parseInt(str.substring(length-2, length));

//output

System.out.println(cents);

amount2 = convert(dollars) + " and " + converts(cents) + " cents."; //The error is here, which I am assuming that the method convert could be wrong.

}//end

public static void main(String[] args)throws IOException{

CheckWriter cw = new CheckWriter();

BufferedReader input = new BufferedReader(new InputStreamReader(System.in));

//boolean correctDate = false;

try{

System.out.print("Enter the date as mm/dd/yyyy: ");

cw.date = input.readLine();

System.out.print("Enter the payee's name: ");

cw.payName = input.readLine();

System.out.print("Enter the amount of the check: ");

cw.amount1 = Double.parseDouble(input.readLine());

cw.convertString();

cw.displayString();

}catch (IOException ioe){

}//end try and catch

}//end main method

}

I have an error and I don't know where I am not able to see the error. Can you please help me here. Thank you