38. Common StringBuilder methods

• Common methods of the StringBuilder class are:

  
  capacity() // get capacity
  length() // get logical length
  setLength(intNumOfChars) // set logical length
  append(value) // adds characters at the end 
  insert(index, value) // inserts characters at specific location 
  replace(startIndex, endIndex, String)
  delete(startIndex, endIndex)
  deleteCharAt(index) // removes one character
  setCharAt(index, character) //changes characters at specified position 
  charAt(index) //returns character at specified position
  substring(index) // from index to the end
  substring(startIndex, endIndex)
  toString() // convert StringBuilder to String