I want to convert a string from a JTextField gotten using field.getText(); to a type double. I tried using valueOf, but then I can't use the + operator or any other math operand. I am making a calculator program in Swing.
How about: double dbl = (new Double(field.getText())).doubleValue(); You'll probably want to wrap it in a try/catch block in case the user puts in something invalid. You could also use regular expressions to do some validation and warn the user if it's bad.