计算小费

import javax.swing.JOptionPane;
public class Money {
    public static void main(String[] args){
    double gratuity;
    double total;
    String input = JOptionPane.showInputDialog(null,"请输入费用：","对话框",JOptionPane.QUESTION_MESSAGE);
    String input1 =JOptionPane.showInputDialog(null,"请输入酬金：","对话框",JOptionPane.QUESTION_MESSAGE);
    double subtotal = Double.parseDouble(input);
    double rate = Double.parseDouble(input1);
    gratuity = (int)(subtotal * rate * 0.01 * 100)/100.00;
    total =(int)((subtotal + gratuity)*100)/100.00;
    System.out.println("The grtuity is " + gratuity + " and total is " + total);
    }
}