
(Display words in ascending alphabetical order) Write a

Display words in ascending alphabetical order
Program plan:
- Import the required packages into the program.
- In the main() method,
- Check whether the argument length is not equal to 1. If yes,
- Display the error message.
- Assign the argument 0 as filename.
- Create a list to hold the words.
- In try block,
- Check the matches between the word from file and alphabets.
- Call the add() method to add the word into list.
- Catch the exception if error occurs.
- Call sort() method to sort the list in ascending order.
- Display the ascending order word.
- Check whether the argument length is not equal to 1. If yes,
The below program demonstrates to sort the word in ascending order from the file and display that list.
Explanation of Solution
Program:
//Import the java packages
import java.util.*;
import java.io.*;
//Class definition
public class Exercise20_01
{
//Main method
public static void main(String[] args)
{
/*Check whether the argument length is not equal to 1 */
if (args.length != 1) {
//Display the error message
System.out.println("Usage: java Exercise20_01 fullfilename");
System.exit(1);
}
//Assign the argument 0 as filename
String filename = args[0];
// Create a list to hold the words
List<String> list = new ArrayList<>();
//In try block
try {
//Create an object for Scanner class
Scanner in = new Scanner(new File(filename));
//Loop executes until the input from file
while (in.hasNext()) {
//Declare and assign the string //variable
String word = in.next();
//Check matches among the word from //file
if (word.matches("[a-z|A-Z].*"))
/*Call add() method to add the word into list */
list.add(word);
}
}
//Catch the exception
catch (Exception ex) {
//Display the error message
System.err.println(ex);
}
/*Call sort() method to sort the list in ascending order */
Collections.sort(list);
// Display the result
System.out.println("Display words in ascending order ");
//Loop executes until the list
for (String word : list) {
//Display the ascending order word
System.out.println(word);
}
}
}
Input file:
Screenshot of Test.txt file
Command to run the program:
java Exercise20_01 Test.txt
Display words in ascending order
hello
hi
hi
jhon
mercy
welcome
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