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How to insert a char at n position java

Java insert char in string at index

public String addChar(String str, char ch, int position) {
    return str.substring(0, position) + ch + str.substring(position);
}

Source: baeldung.com

How to insert a char at n position java

public String addChar(String str, char ch, int position) {
    StringBuilder sb = new StringBuilder(str);
    sb.insert(position, ch);
    return sb.toString();
}

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