public class StringToDoubleConversion7078 {
              public static void main(String[] args) {
                  // Example string
                  String numberAsString = "123.456";
          
                  // Convert the string to a double
                  double convertedNumber = convertStringToDouble(numberAsString);
          
                  // Print the converted double
                  System.out.println("Converted double: " + convertedNumber);
              }
          
              // Function to convert a String to a double
              private static double convertStringToDouble(String str) {
                  try {
                      // Use Double.parseDouble() to convert the string to a double
                      return Double.parseDouble(str);
                  } catch (NumberFormatException e) {
                      // Handle the case when the string is not a valid double
                      System.err.println("Error: " + e.getMessage());
                      return 0.0; // You can choose a default value or handle it differently based on your requirement
                  }
              }
          }