monthlyincome.java

《A first book of java》by Gary J.Bronson 北大出版社

import javax.swing.*;
import java.text.*;  // needed for formatting
public class MonthlyIncome
{
  public static void main(String[] args)
  {
    String s1, outMessage;
    double monthlySales, income;
    DecimalFormat num = new DecimalFormat(",###.00");
    s1 =JOptionPane.showInputDialog("Enter the value of monthly sales:");
    monthlySales = Double.parseDouble(s1);
    if (monthlySales >= 50000.00)
      income = 375.00 + .16 * monthlySales;
    else if (monthlySales >= 40000.00)
      income = 350.00 + .14 * monthlySales;
    else if (monthlySales >= 30000.00)
      income = 325.00 + .12 * monthlySales;
    else if (monthlySales >= 20000.00)  
      income = 300.00 + .09 * monthlySales;
    else if (monthlySales >= 10000.00)
      income = 250.00 + .05 * monthlySales;
    else
      income = 200.00 + .03 * monthlySales;
   
    outMessage = "For monthly sales of $" + num.format(monthlySales)
               + "\nThe income is $" + num.format(income);
    JOptionPane.showMessageDialog(null, outMessage, 
                    "Program 4.5", 
                    JOptionPane.INFORMATION_MESSAGE);
    
    System.exit(0);  
  }
}