存储和检索数组中的数据，导出到文本文件
我是java的新手，在我学习的时候，我正在研究数组，我似乎对这里的错误感到茫然。我不认为它正在以正确的方式提取数据，this program is suppose to read data from a text file, and ask the user for additional inputs, then display a report.我似乎对捐赠输出位有问题，因为我还没有让它工作一次......程序剂量编译并运行， netbeans说它的全部为绿色，除了下面显示方法的禁用代码位。非常感谢任何建议，评论和正确方向的点=）
对于文本文件输出和程序显示输出，也可以使用一些关于获取小数位的建议。
主要课程
import java.util.Scanner;
public class MyEventManager
{
public static void main(String [] args)
{
Scanner keyboard = new Scanner(System.in);
System.out.printf("\nI will read a text file then add it with user "
+ "inputs in \norder to display and export a report detailing "
+ "an event.\n\n");
boolean startOver = false;
if (startOver == false) //enter loop
{
do
{
//ticket price
System.out.printf("What is the single ticket price for "
+ "the event? ");
double singleTicket = keyboard.nextDouble();
//maximum number of donations
System.out.printf("What is the maximum number of donations "
+ "expected for the event? ");
int maxDonations = keyboard.nextInt();
//create a new object for event class
MyEventClass myEvent = new MyEventClass(singleTicket,
maxDonations);
if (myEvent.fruityLoops == false)
do
{
myEvent.readAllData();
}
while (myEvent.fruityLoops != true);
myEvent.displayResults();
System.out.printf("\nWould you like to run program again? "
+ "[Y/N] - ");
String questionAskLoop = keyboard.next();
if ("N".equalsIgnoreCase(questionAskLoop))
{
startOver = true; //sets exit condition to end program...
}
}
while(startOver != true);
}
}
}
第二课
import java.util.Scanner;
import java.io.*;
import java.util.Arrays;
public class MyEventClass
{
private final double TICKET_PRICE;
private final int []moneyDonated;
private double totalTicketsSold;
private int DONATION_ARRAY_SIZE;
private int storedAmountDonations;
private double moneySpent;
boolean fruityLoops;
private boolean donationSuccess;
public static char amountType;
public static double amount;
public MyEventClass (double singleTicket, int maxDonations)
{
this.moneyDonated = new int[]{DONATION_ARRAY_SIZE};
this.fruityLoops = false;
this.TICKET_PRICE = singleTicket;
this.DONATION_ARRAY_SIZE = maxDonations;
this.moneySpent = 0;
}
public boolean myDonation (double donationAmount, int[] moneyDonated)
{
if (storedAmountDonations == DONATION_ARRAY_SIZE)
{
return false;
}
else
{
moneyDonated[storedAmountDonations] = (int) donationAmount;
storedAmountDonations++;
return true;
}
}
public void addNewTickets (double addedTickets)
{
totalTicketsSold += (int) addedTickets;
}
public double getTicketSales ()
{
return totalTicketsSold;
}
public double getTicketEnd ()
{
double ticketEnd = totalTicketsSold * TICKET_PRICE;
return ticketEnd;
}
public int [] getMoneyDonated (int[] moneyDonated)
{
//Calculate and return the total amount of money donated
return moneyDonated;
}
public int storedAmountDonations ()
{
return storedAmountDonations;
}
public double getMoneySpent ()
{
return moneySpent;
}
public void sortMethod (char amountType, double amount)
{
if(amount <= 0) //positive amount check
{
throw new IllegalArgumentException("Error Code B-90: Invalid amount "
+ "(not over 0) -- line: " + amountType + " " + amount
+ " ignored");
}
else if (amountType == 'T' || amountType == 't') //tickets
{
addNewTickets(amount);
}
else if (amountType == 'D' || amountType == 'd') //donations
{
myDonation(amount, moneyDonated);
if (donationSuccess == false) //checks if array is full
{
throw new ArrayIndexOutOfBoundsException ("Error code B-103: "
+ "The array is full " + amount + " will not be stored"
+ " in the array");
}
}
else if (amountType == 'E' || amountType == 'e') //amount spent
{
moneySpent += amount;
}
else
throw new IllegalArgumentException("Error Code B-113: Invalid item "
+ "type (not T, D, or E) -- line: " + amountType + " "
+ amount + " ignored");
}
public void readAllData()
{
int lineCount = 0;
Scanner keyboard = new Scanner( System.in );
System.out.printf("\nPlease input the file location: ");
String readFile = keyboard.next();
try
{
File inputFile = new File (readFile);
Scanner scanFile;
scanFile = new Scanner( inputFile );
System.out.println("Reading data file....");
while (scanFile.hasNext())
{
amountType = scanFile.next().charAt(0);
amount = scanFile.nextDouble();
lineCount++;
try
{
sortMethod(amountType, amount);
}
catch (IllegalArgumentException a)
{
System.out.printf("\nError code B-145: An error occured "
+ "while attempting to add the data from file");
}
catch (ArrayIndexOutOfBoundsException b)
{
System.out.printf("\nError code B-150: An error occured "
+ "while attempting to add to the array.");
}
}
scanFile.close();
System.out.printf("\nThe total amount of readable lines where "
+ lineCount + " lines.\n\n");
}
catch (FileNotFoundException c)
{
System.out.printf("\nError code B-160: The file " + readFile
+ " was not found!\n");
fruityLoops = false; //restart program
}
fruityLoops = true; //contuine on with program
}
public int getLowest (int[] moneyDonated)
{
int lowValue = moneyDonated[0];
for(int i=1;i < moneyDonated.length;i++)
{
if(moneyDonated[i] < lowValue)
{
lowValue = moneyDonated[i];
}
}
return lowValue;
}
public double getAverage(int[] moneyDonated)
{
int sum = moneyDonated[0];
for(int i=1;i < moneyDonated.length;i++)
sum = sum + moneyDonated[i];
double advValue = sum / moneyDonated.length;
return advValue;
}
public int getHighest (int[] moneyDonated)
{
int maxValue = moneyDonated[0];
for(int i=1;i < moneyDonated.length;i++)
{
if(moneyDonated[i] > maxValue)
{
maxValue = moneyDonated[i];
}
}
return maxValue;
}
public void displayResults()
{
double income = 0;//moneyDonated + ticketEnd;
double profits = income - moneySpent;
Scanner keyboard = new Scanner ( System.in );
System.out.printf("\nWhere is the file for the report export? ");
String reportFile = keyboard.next();
try
{
File outputFile = new File (reportFile);
Scanner scanFile = new Scanner (outputFile);
System.out.println("Generating output data file....");
try (BufferedWriter writer =
new BufferedWriter(new FileWriter(outputFile)))
{
writer.write("Event Overall Outcome:");
writer.newLine();
writer.write("Ticket Price %15.2f" + TICKET_PRICE);
writer.newLine();
writer.newLine();
writer.write("Donation Analysis:");
writer.newLine();
writer.write("Lowest donation " + getLowest (moneyDonated));
writer.newLine();
writer.write("Adverage donation " + getAverage (moneyDonated));
writer.newLine();
writer.write("Highest donation " + getHighest(moneyDonated));
writer.newLine();
writer.newLine();
writer.write("Profit/Loss Results:");
writer.newLine();
writer.write(totalTicketsSold + "Tickets sold" + getTicketEnd());
writer.newLine();
writer.write(storedAmountDonations() + " Donations "
+ Arrays.toString(moneyDonated) + " +");
writer.newLine();
writer.write(" --------");
writer.newLine();
writer.write("Total Income " + "%14.2f" + income);
writer.newLine();
writer.write("Total Expenses " + "%12.2f" + " -" + moneySpent);
writer.newLine();
writer.write(" --------");
writer.newLine();
if (profits < 1)
{
writer.write(" Event Losses " + "%13.2f " + profits);
}
else
{
writer.write(" Event Profits " + "%13.2f " + profits);
}
writer.flush();
writer.close();
}
catch (IOException d)
{
System.out.printf("\nError code B-280: There was an error "
+ "while attempting to write to " + reportFile
+ "\nThe file may be damaged!");
}
System.out.printf("\nOutput Success!");
}
catch (FileNotFoundException d)
{
System.out.printf("\nError code B-288: The file " + reportFile
+ " could not be opened! The report cannot be generated.\n");
}
System.out.printf("\nEvent Overall Outcome:");
System.out.printf("\n\n Ticket Price %15.2f", TICKET_PRICE);
System.out.printf("\n\n Donation Analysis: ");
/*System.out.printf("\n Lowest donation " + "%10.2f",
getLowest (moneyDonated));
System.out.printf("\n Adverage donation " + "%10.2f",
getAverage (moneyDonated));
System.out.printf("\n Highest donation " + "%10.2f",
getHighest(moneyDonated));*/
System.out.printf("\n\n Profit/Loss Results: ");
System.out.printf("\n " + totalTicketsSold + " Tickets sold "
/*+ "%3.2f"*/ + getTicketEnd());
System.out.printf("\n " + storedAmountDonations() + " Donations "
/* + "%3.2f"*/ + Arrays.toString(moneyDonated) + " +");
System.out.printf("\n --------");
System.out.printf("\n Total Income " + "%14.2f", income);
System.out.printf("\n Total Expenses " + "%12.2f" + " -", moneySpent);
System.out.printf("\n --------");
if (profits < 1)
{
System.out.printf("\n Event Losses " + "%13.2f \n\n", profits);
}
else
{
System.out.printf("\n Event Profits " + "%13.2f \n\n", profits);
}
}
}
这是文本文件输入
T 25
E 210.99
T 1
D 500.00
E 134.67
D 1
这是文本文件输出
Event Overall Outcome:
Ticket Price %15.2f60.0
Donation Analysis:
Lowest donation 500
Adverage donation 500.0
Highest donation 500
Profit/Loss Results:
26.0Tickets sold1560.0
1 Donations [500] +
--------
Total Income %14.2f0.0
Total Expenses %12.2f -345.65999999999997
--------
Event Losses %13.2f -345.65999999999997
最后这是程序在屏幕上显示的内容......
run:
I will read a text file then add it with user inputs in
order to display and export a report detailing an event.
What is the single ticket price for the event? 25
What is the maximum number of donations expected for the event? 2
Please input the file location: event.txt
Reading data file....
Error code B-150: An error occured while attempting to add to the array.
Error code B-150: An error occured while attempting to add to the array.
The total amount of readable lines where 6 lines.
Where is the file for the report export? export.txt
Error code B-288: The file texport.txt could not be opened! The report
cannot be generated.
Event Overall Outcome:
Ticket Price 25.00
Donation Analysis:
Profit/Loss Results:
26.0 Tickets sold 650.0
1 Donations [500] +
--------
Total Income 0.00
Total Expenses 345.66 -
--------
Event Losses -345.66
Would you like to run program again? [Y/N] -
就像一个FYI，我的异常错误代码A是主类，B是第二个类，下面的数字是消息来自的代码行。我试图帮助我更快地找到我的位置......
我的目标是让显示器看起来像这样。
2 个答案:
答案 0 :(得分：1)
你的主要问题在于你的第二堂课：
this.moneyDonated = new int[]{DONATION_ARRAY_SIZE};
这不会创建一个大小为DONATION_ARRAY_SIZE的数组。 正确的语法是：
this.moneyDonated = new int[DONATION_ARRAY_SIZE];
答案 1 :(得分：1)
上面有两个关键问题。首先是数组的大小。你应该有这样的东西：
this.DONATION_ARRAY_SIZE = maxDonations;
this.moneyDonated = new int[DONATION_ARRAY_SIZE];
其次，donationSuccess布尔值将初始化为false。你有这段代码：
if (donationSuccess == false) //checks if array is full
{
throw new ArrayIndexOutOfBoundsException ("Error code B-103: "
+ "The array is full " + amount + " will not be stored"
+ " in the array");
}
您永远不会更改该donationSuccess值，因此即使不是这种情况，该代码块也会始终抛出该错误。您应该重新考虑初始化和设置donationSuccess值的方式。
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