Question

In Java:

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 that end with a digit. (Hint: loop through the args array) 2. If there are not at least two command line arguments, throw an IllegalArgumentException with an appropriate message.

Answer 1

Here is the Java code to given question.

Sample outputs are added at the end.

Code:

public class CommandLineTest {

    public static void main(String[] args){

        try{
            if(args.length<2){    /*if number of words in command line arguments is less than 2*/

                throw new IllegalArgumentException();    /*throws new IllegelArgumentException*/

            }
            else{

                int numberOfWords=0;     /*uswed to store number of words that end with a digit*/

                String currentWord;     /*used to store current word of command line argument*/

                for(int i=0;i<args.length;i++){     /*runs through all command line arguments*/

                    currentWord=args[i];     /*stores current word in a variable*/

                    int lastIndex=currentWord.length()-1;      /*computes the last index of currentWord*/

                    if(Character.isDigit(currentWord.charAt(lastIndex))){     /*checks if the current word ends with a digit*/

                        numberOfWords+=1;     /*increments the number of words by 1*/

                    }
                }

                System.out.println("Number of words that end with a digit: "+numberOfWords);    /*prints the number of words that end with a digit*/

            }

        }catch (IllegalArgumentException e){

            System.out.println(e+":  There should be atleast 2 command line arguments.");   /*prints exception with appropriate message*/

        }
    }
}

Sample output-1:

Command line arguments:

Output:

Sample output-2:

Command line arguments:

Output: