title: How do I replace all the letters in a string with another character using Java?
body: <p>I want to be able to replace all the letters in a string with an underscore character.  </p>
  
  <p>So for example, lets say that my string is made up of the alpha characters: "Apple". How would I convert that into five underscores, because apple has five characters (letters) in it?</p>