这是PartyOrder类的驱动程序，代码中没有错误。感谢您的帮助。
import javax.swing.JOptionPane;
public class Proj4
{
public static void main(String[] args)
{
int iBalloons;
int iCandles;
int iBanners;
char chrChoice;
String strInput;
String strName;
String strInfo;
strName = "Clayton Southerland's Party Store";
JOptionPane.showMessageDialog(null,"~2014 Party Store~\n\nGet your Birthday Party Supplies Here!",
strName,1);
strInput= JOptionPane.showInputDialog(null,"2014 Birthday Balloons\n Just $2.50 each!\n\n How many balloons would you like to order? (0-50)",
strName ,3);
iBalloons = Integer.parseInt(strInput);
while(iBalloons > 50 || iBalloons < 0)
{
JOptionPane.showMessageDialog(null,"You MUST enter a number between 0-50!",
strName,0);
strInput= JOptionPane.showInputDialog(null,"2014 Birthday Balloons\n Just $2.50 each!\n\n How many balloons would you like to order? (0-50)",
strName ,3);
iBalloons = Integer.parseInt(strInput);
}
strInput= JOptionPane.showInputDialog(null,"2014 Large Birthday Candles\n Just $6.00 each!\n\n How many candles would you like to order? (0-50)",
strName ,3);
iCandles = Integer.parseInt(strInput);
while(iCandles< 0 || iCandles > 50)
{
JOptionPane.showMessageDialog(null,"You MUST enter a number between 0-50!",
strName,0);
strInput= JOptionPane.showInputDialog(null,"2014 Large Birthday Candles\n Just $6.00 each!\n\n How many candles would you like to order? (0-50)",
strName ,3);
iCandles = Integer.parseInt(strInput);
}
strInput= JOptionPane.showInputDialog(null,"2014 Birthday Banners\n Just $2.50 each!\n\n How many banners would you like to order? (0-50)",
strName ,3);
iBanners = Integer.parseInt(strInput);
while(iBanners< 0 || iBanners > 50)
{
JOptionPane.showMessageDialog(null,"You MUST enter a number between 0-50!",
strName,0);
strInput= JOptionPane.showInputDialog(null,"2014 Large Birthday Candles\n Just $6.00 each!\n\n How many candles would you like to order? (0-50)",
strName ,3);
iBanners = Integer.parseInt(strInput);
}
strInput= JOptionPane.showInputDialog(null,"2014 Shipping Option\n\n(O)vernight shipping - $10.00\n(T)wo-Day shipping - $7.50\n(P)riority shipping - $5.00\n\nPlease select a shipping option(O,T, or P)",
strName ,3);
chrChoice = strInput.charAt(0);
PartyOrder Order1 = new PartyOrder(iBalloons,iCandles,iBanners,chrChoice);
strInfo = Order1.invoice();
JOptionPane.showMessageDialog(null,strInfo,
strName,0);
System.exit(0);
}//end Main(String)
}//end Proj4
我的程序在输入步骤后冻结，不再允许使用命令行中的任何内容。它应该显示发票但冻结了
import java.text.DecimalFormat;
public class PartyOrder
{
int balloons; //number of balloons
int candles; //number of candles
int banners; //number of banners ordered
char shippingOption; //either O,T,P
DecimalFormat d1 = new DecimalFormat ( "$##0.00" );
public PartyOrder()
{
}//end PartyOrder()
public PartyOrder(int balloons, int candles, int banners, char shipping)
{
setBalloons(balloons);
setCandles(candles);
setBanners(banners);
setShipping(shipping);
}//end PartyOrder(int,int,int,char)
public void setBalloons(int num)
{
if (num>0)
{
balloons = num;
}
}//end setBalloons(int)
public void setCandles(int num)
{
if (num>0)
{
candles = num;
}
}//end setCandles(int)
public void setBanners(int num)
{
if (num>0)
{
banners = num;
}
}//end setBanners(int)
public void setShipping(char option)
{
if(option == 'O' && option == 'o')
{;
shippingOption = 'O';
}
else if (option == 'T' && option == 't')
{
shippingOption = 'T';
}
else if (option == 'P' && option == 'p')
{
shippingOption = 'P';
}
else
{
shippingOption = 'N';
}
}//end setShipping(int)
public int getBalloons()
{
return balloons;
}//end getBalloons()
public int getCandles()
{
return candles;
}//end getCandles()
public int getBanners()
{
return banners;
}//end getBanners()
public int getShipping()
{
return shippingOption;
}//end getShipping()
public double shippingCost()
{
double dShip; //holds the value given in this method
dShip = 0.00;
if (shippingOption == 'O')
{
dShip = 10.00;
}
else if (shippingOption == 'T')
{
dShip = 7.50;
}
else if (shippingOption == 'P')
{
dShip = 5.00;
}
else if (shippingOption == 'N')
{
dShip = 0.00;
}
return dShip;
}//end shippingCost()
public String shippingType()
{
String strShip; //holds the value given in this method
strShip = "";
if (shippingOption == 'O')
{
strShip = "Overnight";
}
else if (shippingOption == 'T')
{
strShip = "Two-Day Shipping";
}
else if (shippingOption == 'P')
{
strShip = "Priority Shipping";
}
else if (shippingOption =='N')
{
strShip = "Normal (free) Shipping ";
}
return strShip;
}//end shippingType()
private double discount(char chr)
{
double dDisc;
dDisc = 0.00;
while (chr == 'B')
{
if (balloons <10)
{
dDisc = 0.00;
}
else if (balloons >=10 && balloons <20)
{
dDisc = 0.10;
}
else if (balloons >=20 && balloons <30)
{
dDisc = 0.15;
}
else if (balloons >=30 && balloons<40)
{
dDisc = 0.20;
}
else if (balloons >=40)
{
dDisc = 0.25;
}
}// end while
while (chr == 'C')
{
if (candles <10)
{
dDisc = 0.00;
}
else if (candles >=10 && candles <20)
{
dDisc = 0.10;
}
else if (candles>=20 && candles <30)
{
dDisc = 0.15;
}
else if (candles >=30 && candles <40)
{
dDisc = 0.20;
}
else if (candles >=40)
{
dDisc = 0.25;
}
}// end while
while (chr == 'N')
{
if (banners <10)
{
dDisc = 0.00;
}
else if (banners >=10 && banners <20)
{
dDisc = 0.10;
}
else if (banners >=20 &&banners <30)
{
dDisc = 0.15;
}
else if (banners >=30 && banners <40)
{
dDisc = 0.20;
}
else if (banners >=40)
{
dDisc = 0.25;
}
}// end while
return dDisc;
}//end discount(char)
private double subtotal(char chr)
{
double dSub;
dSub = 0.00;
if (chr == 'B')
{
dSub = ((balloons * 2.50)*(discount('B'))) + (balloons * 2.50);
}
else if (chr == 'C')
{
dSub = ((candles * 6.00)*(discount('C'))) + (candles * 6.00);
}
else if (chr == 'N')
{
dSub = ((banners * 2.00)*(discount('N'))) + (banners* 2.00);
}
return dSub;
}//end subtotal(char)
public double subtotal()
{
double dSubtot;
dSubtot = 0.00;
dSubtot = subtotal('B')+ subtotal('C') + subtotal('N');
return dSubtot;
}//end subtotal()
public double tax()
{
double dTax;
dTax = (.05 * subtotal());
return dTax;
}//end tax()
public double orderTotal()
{
double dTotal;
dTotal = subtotal() + tax() + shippingCost();
return dTotal;
}//end orderTotal()
public String invoice()
{
String strInfo;
strInfo = " Balloons: " + balloons +" @ $2.50 = " + d1.format(balloons * 2.50) + " * Discount Rate: " + discount('B') + " = " + subtotal('B');
strInfo+="\n Candles: " + candles + " @ $6.00 = " + d1.format(candles * 6.00) + " * Discount Rate: " + discount('C') + " = " + subtotal('C');
strInfo+="\n Banners: " + banners + " @ $2.00 = " + d1.format(banners * 2.00) + " * Discount Rate: " + discount('N') + " = " + subtotal('N');
strInfo+="\nSubtotal: " + d1.format(subtotal());
strInfo+="\n\tTax: " + d1.format(tax());
strInfo+="\nShipping: " + d1.format(shippingCost()) + " - " + shippingType();
strInfo+="\nTotal: " + d1.format(orderTotal());
return strInfo;
}//end invoice()
}
答案 0 :(得分：0)
在＆＃34;折扣（）＆＃34;你陷入无限循环的方法：
private double discount(char chr)
{
double dDisc;
dDisc = 0.00;
while (chr == 'B')
{
if (balloons <10)
{
dDisc = 0.00;
break;//add it here
}
else if (balloons >=10 && balloons <20)
{
dDisc = 0.10;
break;//add it here
...
您应该根据逻辑为这些循环添加break。