How to fix this Letter Remover program? Is my algorithm correct?

[potanta]

So I have to write a program which is called "Letter Remover" in BlueJ. It is supposed to remove letters when the user types in the letter. So the program has to run with a user inputting any word they want, then they will be asked to type a letter from that word they want to remove. For example if I type the word "aaabcdef" and then i type "a" when asked to type a letter, then it should output as "bcdef". Is my algorithm correct? And by the way, I get an error from BlueJ, saying that variable c might not have been initialized. Also, what do I write in the parenthesis "System.out.println()" to print out the modified word (meaning the word after a character has been deleted)

import java.util.Scanner;


/**
 * Write a description of class Runner here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Runner
{

   
    public static void main(String[]args)
    {
        Scanner scan = new Scanner(System.in);
        
        String word = "";
       
       
         
        
        System.out.println("Enter a word.");
        word = scan.nextLine();
        System.out.println("Enter a letter to remove.");
        
        char c;
        int i = word.indexOf(c);
        int j = 0;
        c = scan.nextLine().charAt(i);
       
       
       
       for (i= word.indexOf(c); i >= word.indexOf(c); i++)
       {
           
         
           word.substring(i, i);
           i = word.indexOf(c);
           
          
           
       }
        System.out.println(word);   
       
       }
        
        
        

    }

[Norm]

Is my algorithm correct?

Could you post your algorithm (in English) so we can see it? Normally the algorithm for a complicated section of code is added to the code as comments.
Better would be for you to thoroughly test it to see if the code does what you want.

Note: The substring method returns a String. The code is ignoring the returned String.

[potanta]

Well, I have to do this for school, so my teacher gave me a sheet with a little algorithm in it. I am not sure what he means:


int loc = x.indexOf(y);
while there are more letters to remove
{
take out the letter ( substring);
loc = x.indexOf(y);
}

[potanta]

Here is the algorithm my teacher gave me:

int loc = x.indexOf(y);

while there are more letters to remove
{
take out the letter ( substring);
loc = x.indexOf(y);
}

[Norm]

The names in that code make it harder to understand.
I assume x is the String with the letters to be removed
and y is the String with the single letter that is to be removed.
loc has a good name.

Given that algorithm, you need to expand the logic for removing letter at the position loc using the substring method.
For example get the String before loc and the String after loc and concatenate them to make a new String.

[camel-man]

Another way to do this is use StringBuilder and the method deleteCharAt(). This way you will avoid all the substrings and concatenation.