Converting String to double
  • For conversions to primitive data types special classes are used: Double, Integer, ...
  • Converting String to double 
    String string = "3.2";

double dvalue = 0;
try
{
	dvalue = Double.valueOf (string).doubleValue();
}

catch (NumberFormatException exception)
{
	exception.printStackTrace();
}
System.out.println(dvalue);
Java Tutorial - Standard Classes Jens Trapp, 1997