我有一个初学者 JAVA 类(class)的作业，但我似乎无法解决它。我们需要创建一个程序，根据交易计算每月佣金。交易金额使用 math.random() 定义。
这个月从一月开始。我们使用 JOPtionPane.showconfirmdialog 来询问是否有客户。如果是，则会出现另一个确认对话框，询问客户是否希望购买该商品。如果客户接受购买该商品，我们就会计算佣金。
如果没有客户或者我们在一个月内达到 15K 佣金，我们会跳到下个月并重复。
最后，一旦我们在年底前佣金达到 10 万，该计划就会结束，并告诉卖家在今年剩下的时间里去度假。如果这在现实生活中是真的就好了……
但是，我的问题是，由于某种原因，如果我在 12 月之后没有达到 100K，我无法编写一个循环来退出程序(并显示一条消息)。我不断地得到
线程“main”中出现异常 java.lang.ArrayIndexOutOfBoundsException: 12 在 Commission.main(Commission.java:42)
public static void main(String[] args) {
String[] months = { "January", "February", "March", "April",
"May", // Initialize array for months of the year
"June", "July", "August", "September", "October", "November",
"December" };
String[] diamonds = { "diamond", "ruby", "sapphire", "emerald",
"topaz", "zircon" }; // Initialize array for different precious gems types
double[] monthlyCommission; // Initialize double variable for total commission for the month
monthlyCommission = new double[12]; // Initialize array with 12 values for monthly commission
double yearTotal; // Initialize variable for total commission in the year
double transaction; // Initialize value for a sale transaction
double commission; // Initialize value for commission based on value of sale transaction
int month = 0;
int diamond;
yearTotal = 0;
JOptionPane.showMessageDialog(null, "Welcome to X's Jewelry Store!"); // Display welcome message dialog
for (; monthlyCommission[month] < 15000;) {
int storeCustomer = JOptionPane.showConfirmDialog(null,
"Is there a customer in the store?", months[month]
+ " month", JOptionPane.YES_NO_OPTION);
while (storeCustomer == JOptionPane.NO_OPTION) { // Statement to process if there is no customer
{
month += 1;
storeCustomer = JOptionPane.showConfirmDialog(null,
"Is there a customer in the store?", months[month]
+ " month", JOptionPane.YES_NO_OPTION);
}
}
if (storeCustomer == JOptionPane.YES_OPTION) { // Statement to process if there is a customer
diamond = (int) (Math.random() * 6); // Choose randomly a value between 0-5
transaction = Math.random() * 50000.0;
transaction = Math.round(transaction * 100) / 100;
int buyItem = JOptionPane.showConfirmDialog(null,
"Do you wish to buy this " + diamonds[diamond]
+ " for "
+ String.format("$%4.2f", transaction) + "?");
if (buyItem == JOptionPane.NO_OPTION) // Statement to process if user does not want the item
JOptionPane.showMessageDialog(null,
"No problem. See you next time.");
if (buyItem == JOptionPane.YES_OPTION) { // Statement to process if user wishes to buy the item
if (transaction <= 10000)
commission = transaction * 0.1;
else if (transaction > 30000.0)
commission = 10000 * 0.10 + 20000 * 0.15
+ (transaction - 30000) * 0.20;
else
commission = 10000 * 0.10 + (transaction - 10000) * 0.15;
commission = Math.round(commission * 100) / 100;
monthlyCommission[month] += commission;
yearTotal += commission;
JOptionPane.showMessageDialog(null, String.format(
"Your commission for this transaction is $%4.2f",
commission));
System.out.println(yearTotal); // Displays the commission total for the transaction
if (yearTotal > 100000) // Exit loop if total commission for the year is greater than 100000
break;
}
}
if (monthlyCommission[month] >= 15000) {
JOptionPane.showMessageDialog(null, "You have earned $"
+ String.format("%4.2f", monthlyCommission[month])
+ ". You can rest the remainder of the month!"); // Display dialog once the monthly commission reaches 15000
month += 1;
}
}
JOptionPane.showMessageDialog(null,
"Congratulations!! You have earned a total of $"
+ String.format("%4.2f", yearTotal)
+ ". Enjoy your vacation in Honolulu!"); // Display dialog once the yearly commission reaches 100000
}
}
最佳答案
我相信您的问题在于您开头的“for”声明。您的退出条件是当您每月的佣金达到超过15000时，无论是哪一个月。由于如果您的佣金达到 15000(第 72-77 行)，您已经增加了月份，因此您的 for 循环应该只迭代 0-11 个月。因此第 20 行应该看起来更像:
for( month = 0; month < 12; month++ ){
另外，第 66 行的中断有点难看，我可以建议将该条件也移到 for 循环中吗？因此:
for( month= 0; ( (month < 12) && (yearTotal<100000) ) ; month++ ){
关于java - 初学者 JAVA 作业中的循环，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19262991/