pattern

/**
 * bhatt.umang7@gmail.com
 * @author Umang B Bhatt
 * if a number is repeated more than 3 times then exception should be thrown
 */
class MyException extends RuntimeException
{

    public MyException(String message)
    {
        super(message);
    }
}

public class test

{

    public static void main(String args[])
    {
        if (args.length > 2)
        {

            // do something
            System.out.print("Invalid number of arguments. More than one arguments were give.\nOnly onw was expected");
            System.exit(0);
        }

        else if (args.length != 1)
        {
            System.out.print("You must pass some argument");

            System.exit(0);
        }
        String st = args[0];

        for (int i = 0; i < st.length(); i++)
        {

            if (Character.isDigit(st.charAt(i)) == false)
            {

                System.out.print("All the arguments needs to be numeric");
                System.exit(0);
            }
        }

        // now getting the array with values
        char arr[][] = new char[10][3];

        int val = 65;
        for (int i = 0; i < 3; i++)
        {

            for (int j = 0; j < 10; j++)
            {

                arr[j][i] =(char) val;
                val++;
            }
        }

        arr[6][2] = '@' ;
        arr[7][2] = '$' ;

        arr[8][2] = '#' ;
        arr[9][2] = '*' ;

        for(int i = 0 ; i < st.length() ; i++)
        {

            char c = st.charAt(i);
            int t = c -48;

            if(arr[t][0]=='1')
            {
                throw  new MyException("There were more than 3 accurance of same number");
            }

            else
            {
                System.out.print(arr[t][0]);

                arr[t][0] = arr[t][1];
                arr[t][1] = arr[t][2];

                arr[t][2] = '1';
            }
        }
        System.out.println();

    }
}