Question

is there anything wrong with the solution. the question are from java course

Write a main method that will request the user to enter Strings using a JOptionPane input dialog. The method should continue accepting strings until the user types “STOP”.

      Then, using a JOptionPane message dialog, tell the user how many of the strings begin and end with a digit.

Answer:

import javax.swing.*; public class IsAllLetters {     public static void main(String[] args) {         String input;         int count = 0;         boolean nonAlphabet = false;         while (true) {             nonAlphabet = false;             input = JOptionPane.showInputDialog("Enter a string (STOP to exit): ");             if (input.equalsIgnoreCase("STOP")) break;             for (char letter : input.toCharArray()) {                 if (!Character.isLetter(letter)) {                     nonAlphabet = true;                     break;                 }             }             if (!nonAlphabet) count += 1;         }         JOptionPane.showMessageDialog(null, "Valid numbers of the strings that was entered is " + count);     } }

Write a complete main method that does the following:

1. Takes any number, but at least two, command line arguments which are words (represented as strings) and will print to the console the number of words of length three. (Hint: loop through the args array)
2. If there are not at least two command line arguments, throw an IllegalArgumentException with an appropriate message.

For example,

C:>java Question1 Mary had a little cat

There are 2 words of length three

Selected Answer:

// given main method public class Question1{ public static void main (String args[ ]) { int num, divisible = 0; // this test the two arguments. if ( args.length < 2){ throw new IllegalArgumentException("Two minimum argument is required."); } Else{ //parsing the argument to integer for ( int i = 0;i < args.length; i++) { num = Integer.parseInt(args[i]); if ( num % 10 == 0){ // its checks the divisibility of (x/10) divisibles = divisibles + 1; } } }// prints out the results and ends the program.

Answer 1

Below are the corrected code.

===============================================================================


import javax.swing.*;

public class IsAllLetters {

    public static void main(String[] args) {

        String input;

        int count = 0;

        while (true) {



            input = JOptionPane.showInputDialog("Enter a string (STOP to exit): ");

            if (input.equalsIgnoreCase("STOP")) break;

            if (input.length() >= 2 && Character.isDigit(input.charAt(0)) && Character.isDigit(input.charAt(input.length() - 1))) {
                count++;
            }

        }

        JOptionPane.showMessageDialog(null, "Valid numbers of the strings that was entered is " + count);

    }

}

=====================================================================

// given main method

public class Question1 {

    public static void main(String args[]) {

        int num, divisible = 0;

// this test the two arguments.

        if (args.length < 2) {

            throw new IllegalArgumentException("Two minimum argument is required.");

        } else {
//parsing the argument to integer
            int length3Count = 0;
            for (int i = 0; i < args.length; i++) {

                if(args[i].length()==3){
                    length3Count+=1;
        
                }

            }

            System.out.println("There are "+length3Count+" words of length three");

        }// prints out the results and ends the program.
    }
}

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