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我的程序運行的正是我希望它的方式，但我在控制檯中的錯誤消息：在線程我的程序有什麼問題 - 錯誤信息但工作正常？
異常「主要」 java.lang.IndexOutOfBoundsException：指數： 6，尺寸：6
在java.util.ArrayList.rangeCheck（ArrayList.java:653）
在java.util.ArrayList.get（ArrayList.java:429）
在Kevinmath4.checkAnswers（Kevinmath4.java： 152）
在Kevinmath4.main（Kevinmath4.java:39）
下面是代碼：
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.JOptionPane;
public class Kevinmath4 {
static File filename = new File("homework.txt");
static ArrayList<Object> aList = new ArrayList<Object>();
static String homework = "";
static File filename2 = new File("homework2.txt");
static ArrayList<Object> aList2 = new ArrayList<Object>();
static String homework2 = "";
static String answerPass = "";
static ArrayList<Object> aList3 = new ArrayList<Object>();
static final int TOTAL_QUESTIONS = 5;
static String date;
public static void main(String[] args) throws FileNotFoundException {
String initialInput = JOptionPane.showInputDialog(null,
"Enter Add answers/Check answers to continue");
switch (initialInput) {
case "Add answers":
answers("excalibur117", aList, filename);
break;
// Need to store the array permanently
case "Check answers": // Need to make it so it stores array of
// Kevin's answers permanently
clearFile(filename2);
answers("Kevin", aList2, filename2);
readAnswers(filename, aList3);
checkAnswers(aList3, aList2);
break;
default:
JOptionPane.showMessageDialog(null, "Please enter a valid option.");
break;
}
clearFile(filename2);
// exit the program
JOptionPane.showMessageDialog(null,
"Thanks for using this program. Cheers!");
}
public static void answers(String pass, ArrayList<Object> list, File f) {
answerPass = JOptionPane.showInputDialog(null,
"Please enter the password");
// validate user
while (!answerPass.equals(pass)) {
JOptionPane.showMessageDialog(null,
"Incorrect Password. Please try again.");
answerPass = JOptionPane.showInputDialog(null,
"Please enter the password.");
}
// add answers
String final1 = "";
do {
list.clear();
// validate the date of the answers
date = JOptionPane.showInputDialog(null,
"Enter the date of the desired" + " answers (MM/DD/YY)");
// add your answers
enterAnswers(date, list, f);
// verify the answers
final1 = JOptionPane.showInputDialog(null, "Is this correct: "
+ list.get(1) + " " + list.get(2) + " " + list.get(3) + " "
+ list.get(4) + " " + list.get(5) + "? (Yes/No)");
} while (final1.charAt(0) == 'n' || final1.charAt(0) == 'N');
}
public static void enterAnswers(String options, ArrayList<Object> list,
File f) {
do {
boolean valid = false;
list.add(date);
for (int i = 0; i < 5; i++) {
while (!valid) {
homework = JOptionPane
.showInputDialog("Please enter your answer for question "
+ (i + 1));
if (!homework.isEmpty())
valid = true;
}
list.add(homework);
valid = false;
}
writeFile(f, list); // write the answers to a file
break;
} while (!homework.isEmpty());
}
public static void writeFile(File filename, ArrayList<Object> list) {
try {
FileWriter fw = new FileWriter(filename, true);
Writer output = new BufferedWriter(fw);
for (int j = 0; j < list.size(); j++) {
output.write(list.get(j) + "\n");
}
output.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(null,
"Oops! I cannot create that file.");
}
}
public static void clearFile(File filename) {
try {
FileWriter fw = new FileWriter(filename, false);
Writer output = new BufferedWriter(fw);
output.write("");
output.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(null,
"Oops! I cannot create that file.");
}
}
public static void checkAnswers(ArrayList<Object> a, ArrayList<Object> b) {
int i = 1; // counter variable
int j = a.indexOf(date);
for (Object obj : a) { // iterate through any list
for (int k = (j + 1); k < (j + 6); k++) {
if (obj.getClass() == String.class) { // find if it's a
// string
if (!a.get(k).equals(b.get(i))) {
JOptionPane.showMessageDialog(null, "#" + (i)
+ " is wrong.");
}
}
if (obj.getClass() == Double.class) { // or a double
if (!a.get(k).equals(b.get(i))) {
JOptionPane.showMessageDialog(null, "#" + (i)
+ " is wrong.");
}
}
if (obj.getClass() == Integer.class) { // or an integer
if (!a.get(k).equals(b.get(i))) {
JOptionPane.showMessageDialog(null, "#" + (i)
+ " is wrong.");
}
}
i++;
}
}
}
public static void readAnswers(File filename, ArrayList<Object> list)
throws FileNotFoundException {
Scanner s = new Scanner(new File("homework.txt"));
while (s.hasNextLine()) {
list.add(s.nextLine());
}
s.close();
}
}
我在做什麼錯？
請問哪行代碼是152行？ –
你認爲這個例外意味着什麼？ –