如何在不使用Java中的替换功能的情况下替换字符串中的字符？

Question

So I am asking for a string to be inputted, then I am asking what the user wants to do to the string, in this case, I am trying to replace the first occurrence of a character. I can ask for what wants to be replaced and what to replace it with. I also know how to do the replacement somewhat, but say if the string has 2 of the same characters, I get a new String for both

(Change i to o: (input)"Find Dime" --->(output) "Fond Dime" & "Find Dome")

I only need the first one.

else if (UserCommand.equalsIgnoreCase("replace first"))
    {
        System.out.println("Enter the character to replace");
        String Replace = input.next();
        System.out.println("Enter the new character");
        String Replacement = input.next();
        for (int i = 0; i<String.length();i++)
        {
            if (String.charAt(i)==Replace.charAt(0)) 
            {
                StringEdit = String.substring(0,i) + Replacement + String.substring(i + Replace.length());
            }
        }

Output:

Enter the string lump sum Enter the character to replace u Enter the new character o lomp sumlump som

Answer 1

if you only need the first String use

break;

in the if statement