我目前在我的阵列中收到一个出界问题，我真的不确定我在哪里出错了。我真的在寻找第二双眼睛，因为我会失去理智。
老实说，我很欣赏任何帮助。 不，真的：谢谢。
package com.jpmorgan.spring.csv;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class CSVRead {
static void read() throws IOException {
String csvFileToRead = "profit.csv";
BufferedReader br = null;
String line = "";
String splitBy = ",";
try {
br = new BufferedReader(new FileReader(csvFileToRead));
while ((line = br.readLine()) != null) {
String[] array = line.split(splitBy);
System.out.println("Equity & Bonds: [Instrument Type= " + array[0] + " , Name=" + array[1] + " , Quantity=" + array[2]
+ " , Buy=" + array[3] + " , Sell=" + array[4] + /*" , Coupon=" + array[5] +*/ "]");
}
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("Done reading CSV file");
}
}
这是完整的CSV文件。 我尝试过使用调试但是没有多大帮助。
instrument_type,name,quantity,buy_price,sell_price,coupon
Equity,AAA,123,1.01,1.10
Equity,BBBB,3,1.05,1.01
Bond,CCC,3,,,0.13
Equity,AAA,12,1.11,1.13
Bond,DD,3,,,1.24
主要课程供参考。
/**
* Main class is menu driven, receives CSV input.
* This program reads, calculates and writes CSV files.
* @author David McNeill
* @version 1.0 - 17/03/1015
*/
package com.jpmorgan.spring.csv;
import java.util.Scanner;
public class CSVMain{
public static void main(String[] arg) throws Exception {
@SuppressWarnings("resource")
Scanner in = new Scanner(System.in);
int userChoice;
boolean quit = false;
do {
System.out.println("Please choose an option using 1 - 4"); //print text to screen
System.out.println("------------------------------------"); //print text to screen
System.out.println("1: Read 'input' CSV file"); //print text to screen
System.out.println("2: Calculate 'input' CSV file"); //print text to screen
System.out.println("3: Write calculation result to CSV file"); //print text to screen
System.out.println("4: Exit program"); //print text to screen
userChoice = in.nextInt(); //'in' equals integer
if (userChoice == 4) //when '3' is input then...
quit = true; //the program will now quit
else if (userChoice == 1) //when '1' is input then...
CSVRead.read();
else if (userChoice == 2);
//####################calculations go here#########################
//####################calculations go here#########################
//####################calculations go here#########################
else if (userChoice == 3)
CSVWrite.write();
} while (!quit);
}
}
答案 0 :(得分：0)
分割线后，您应确保获得正确数量的列。
我无法告诉您如何修复潜在的错误数据，但我可以帮助您识别它。只需用以下内容替换内部循环：
int lineNum = 0;
while ((line = br.readLine()) != null) {
String[] array = line.split(splitBy);
if (array.length < 5)
throw new Exception("There's a problem with " + csvFileToRead + " on line " + lineNum + ":\n" + line);
System.out.println("Equity & Bonds: [Instrument Type= " + array[0] + " , Name=" + array[1] + " , Quantity=" + array[2]
+ " , Buy=" + array[3] + " , Sell=" + array[4] + /*" , Coupon=" + array[5] +*/ "]");
lineNum++;
}
答案 1 :(得分：0)
您的CSVRead没有主要方法..将呼叫更改为CSVRead.read();
import java.util.Scanner;
public class CSVMain{
public static void main(String[] arg) throws Exception {
@SuppressWarnings("resource")
Scanner in = new Scanner(System.in);
int userChoice;
boolean quit = false;
do {
System.out.println("Please choose an option using 1 - 4"); //print text to screen
System.out.println("------------------------------------"); //print text to screen
System.out.println("1: Read 'input' CSV file"); //print text to screen
System.out.println("2: Calculate 'input' CSV file"); //print text to screen
System.out.println("3: Write calculation result to CSV file"); //print text to screen
System.out.println("4: Exit program"); //print text to screen
userChoice = in.nextInt(); //'in' equals integer
if (userChoice == 4) //when '3' is input then...
quit = true; //the program will now quit
else if (userChoice == 1) //when '1' is input then...
CSVRead.read();
else if (userChoice == 2);
//####################calculations go here#########################
//####################calculations go here#########################
//####################calculations go here#########################
} while (!quit);
}
}
CSVRead.java
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class CSVRead {
static void read() throws IOException {
String csvFileToRead = "profit.csv";
BufferedReader br = null;
String line = "";
String splitBy = ",";
try {
br = new BufferedReader(new FileReader(csvFileToRead));
while ((line = br.readLine()) != null) {
String[] array = line.split(splitBy);
System.out.println("Equity & Bonds: [Instrument Type= " + array[0] + " , Name=" + array[1] + " , Quantity=" + array[2]
+ " , Buy=" + array[3] + " , Sell=" + array[4] + /*" , Coupon=" + array[5] +*/ "]");
}
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("Done reading CSV file");
}
}
输出
Please choose an option using 1 - 4
------------------------------------
1: Read 'input' CSV file
2: Calculate 'input' CSV file
3: Write calculation result to CSV file
4: Exit program
1
Equity & Bonds: [Instrument Type= instrument_type , Name=name , Quantity=quantity , Buy=buy_price , Sell=sell_price]
Equity & Bonds: [Instrument Type= Equity , Name=AAA , Quantity=123 , Buy=1.01 , Sell=1.10]
Equity & Bonds: [Instrument Type= Equity , Name=BBBB , Quantity=3 , Buy=1.05 , Sell=1.01]
Equity & Bonds: [Instrument Type= Bond , Name=CCC , Quantity=3 , Buy= , Sell=]
Equity & Bonds: [Instrument Type= Equity , Name=AAA , Quantity=12 , Buy=1.11 , Sell=1.13]
Equity & Bonds: [Instrument Type= Bond , Name=DD , Quantity=3 , Buy= , Sell=]
Done reading CSV file
替代方案，将read方法重命名为main中的CSVRead
class public class CSVRead {
static void main() throws IOException {
然后像CSVRead.main();类
CSVMain一样调用它