在Java中把String转换为Double

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if((e.getSource() == jBook)) {
    String name = jlbName.getText();
    String date = jlbDateProduce.getText();
    String time = jr1.getText();
    int number = (Integer.parseInt(jtfNoOfTicket.getText().trim()));
    String total = jlbTotal.getText();
    String price = jlbPrice.getText();

    //Passing
    ticketReservation frame = new ticketReservation(
        name, date, time, price, total, String.valueOf(number));
}

回答

String text = "12.34"; // example String
double value = Double.parseDouble(text);

double total = Double.parseDouble(jlbTotal.getText());
double price = Double.parseDouble(jlbPrice.getText());