price.java

来自「java源程序 对初学者有很大的帮助 从简单到复杂」· Java 代码 · 共 44 行

//********************************************************************
//  Price.java       Author: Lewis/Loftus
//
//  Demonstrates the use of various Keyboard and NumberFormat
//  methods.
//********************************************************************

import cs1.Keyboard;
import java.text.NumberFormat;

public class Price
{
   //-----------------------------------------------------------------
   //  Calculates the final price of a purchased item using values
   //  entered by the user.
   //-----------------------------------------------------------------
   public static void main (String[] args)
   {
      final double TAX_RATE = 0.06;  // 6% sales tax

      int quantity;
      double subtotal, tax, totalCost, unitPrice;

      System.out.print ("Enter the quantity: ");
      quantity = Keyboard.readInt();

      System.out.print ("Enter the unit price: ");
      unitPrice = Keyboard.readDouble();

      subtotal = quantity * unitPrice;
      tax = subtotal * TAX_RATE;
      totalCost = subtotal + tax;

      // Print output with appropriate formatting
      NumberFormat fmt1 = NumberFormat.getCurrencyInstance();
      NumberFormat fmt2 = NumberFormat.getPercentInstance();

      System.out.println ("Subtotal: " + fmt1.format(subtotal));
      System.out.println ("Tax: " + fmt1.format(tax) + " at "
                          + fmt2.format(TAX_RATE));
      System.out.println ("Total: " + fmt1.format(totalCost));
   }
}