Replacing a single character in a String

Question

The issue is needing to replace a single character in a given string while maintaining the other characters in the string.

The code is:

    i         


        

Answer 1

You almost did it, just add a counter in your loop:

int num2replace = keyboard.nextInt();
int count = 0;
for (int i = 0; i < bLength; i++) {
    if (baseString.charAt(i) == char2replace.charAt(0)) {
        count++;
        if (count == num2replace){
            baseString = baseString.substring(0, i) +
                    secondChar + baseString.substring(i + 1);
            break;
        }
    }
    if (char2replace.length() > 1) {//you need move this out of loop
        System.out.println("Error you can only enter one character");
    }


}
System.out.println(baseString);

Answer 2

You can use command.replaceAll("and", "a") for example

Answer 3

You can use StringBuilder to replace a single character at some index, like this:

int charIndex = baseString.indexOf(charToBeReplaced);
StringBuilder baseStringBuilder = new StringBuilder(baseString);
baseStringBuilder.setCharAt(num2replace, secondChar);

Read more about StringBuilder's setCharAt() method here.