Question

The output is always a String, for example H,E,L,L,O,. How could I limit the commas? I want the commas only between letters, for example H,E,L,L,O.

import java.util.Scanner;

import java.lang.String;

public class forLoop 

{
    public static void main(String[] args)
    {
        Scanner Scan = new Scanner(System.in);

        System.out.print("Enter a string: ");
        String Str1 = Scan.next();

       String newString="";
       String Str2 ="";
        for (int i=0; i < Str1.length(); i++)
        {
                newString = Str1.charAt(i) + ",";

                Str2 = Str2 + newString;  

        }
       System.out.print(Str2);

    }
}

Answer 1

The easiest way I see is :

public static void main(String[] args) {
    Scanner Scan = new Scanner(System.in);

    System.out.print("Enter a string: ");
    String Str1 = Scan.nextLine();

   String newString="";
   String Str2 ="";
    for (int i=0; i < Str1.length()-1; i++)
    {
            newString = Str1.charAt(i) + ",";

            Str2 = Str2 + newString;

    }
   Str2 = Str2 + Str1.charAt(Str1.length()-1);
   System.out.println(Str2);
}

The output it will give is :

run:
Enter a string: Hello world
H,e,l,l,o, ,w,o,r,l,d
BUILD SUCCESSFUL (total time: 5 seconds)

Though I will highly recommend learning regular expression as suggested by @Roman. Till then this will do the trick. 🙂