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);
}

add character to a string java

public class JavaHungry {
    public static void main(String args[]) {
      char ch = 'J';
      String str = "avaHungry";
      //Adding character at the beginning
      str = ch + str; 
      System.out.println(str); 
    }
}