title: What is Double.parseDouble(String) and what is the difference between Double.parseDouble(String) and Double.valueOf(double)?
body: <p>I don't know how to convert a <code>String</code> to a <code>double</code>.  How can I use <code>Double.parseDouble(String)</code> and <code>Double.valueOf(double)</code>?  I would also like to know the difference between <code>Double.parseDouble(String)</code> and <code>Double.valueOf(double)</code>.</p>