我已经创建了2个类，一个是执行代码的驱动程序类，并且从该类调用所有方法。该代码需要从我的文件中读取信息，并将数据存储在StudentScore的ArrayList中（我的其他类）。运行代码时，出现此错误
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 4, Size: 4
at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)
at StudentScore.toString(StudentScore.java:153)
at ScoreDriver.main(ScoreDriver.java:37)
这是我的驱动程序类
import java.util.ArrayList;
import java.util.Scanner;
import java.io.*;
public class ScoreDriver extends StudentScore{
public static void main(String[] args) throws Exception {
String fileName = "scores.txt";
String line = null;
ArrayList<Integer>studentIDNumber = new ArrayList<Integer>();//Set student ID as an arraylist
ArrayList<Integer>verbalScore = new ArrayList<Integer>();//Set verbal score as an arraylist
ArrayList<Integer>mathScore = new ArrayList<Integer>();// Set math score as an arraylist
FileReader fileReader = new FileReader(fileName); //Read from file
BufferedReader bufferedReader = new BufferedReader(fileReader);
while((line = bufferedReader.readLine()) != null) {
String[] values = line.split(",",-1);
if(values[0].length() > 1 )
{
System.out.println(line);
studentIDNumber.add(Integer.parseInt(values[0])); // the first value is the ID number
verbalScore.add(Integer.parseInt(values[1]));// Second value is verbal score
mathScore.add(Integer.parseInt(values[2])); // third value is math score
}
}
bufferedReader.close(); //Closing file
StudentScore value = new StudentScore();// Instantiate what a student score is
value.setstudentIDNumber(studentIDNumber); // Includes a ID number, verbal score, math score and total score
value.setverbalScore(verbalScore);
value.setmathScore(mathScore);
value.gettotalScore();
value.toString(15630);// Input any student ID number that you want to look up to check that students scores
System.out.println("The average Evidence-base Reading and Writing Score is: " + AverageVerbalScore());
System.out.println("The average Math score is: " + AverageMathScore());
System.out.println("The average combined score is: " + AverageCombinedScore());
System.out.println("The total number of unique test-takers is: " + UniqueTest());
value.HighestCombined(15630);// Input the student ID number to see what their best math score, verbal score and superscore is
System.out.println("The highest Evidence-base Reading and Writing score is: " + HighestVerbal());
System.out.println("The lowest Math score is: " + LowestMath());
}
}
这是我的另一堂课
import java.util.ArrayList;
public class StudentScore
{// Instantiate a Student's Score
private static ArrayList<Integer>studentIDNumber;
private static ArrayList<Integer>verbalScore;
private static ArrayList<Integer>mathScore;
public static ArrayList<Integer>totalScore = new ArrayList<Integer>();
public void setstudentIDNumber(ArrayList<Integer> value)// Setting a
studentIDNumber
{
this.studentIDNumber = value;
}
public void setverbalScore(ArrayList<Integer> value)//Setting a verbal
score
{
this.verbalScore = value;
}
public void setmathScore(ArrayList<Integer> value)// Setting a math
score
{
this.mathScore = value;
}
public void gettotalScore()// calculate total score
{
for (int i = 0; i < verbalScore.size(); i++)
{
int value = ((verbalScore.get(i) + mathScore.get(i))); // total
score is the verbal and math combined
totalScore.add((value)); //add value to total score
System.out.println(totalScore.get(i));
}
}
public static int AverageVerbalScore()// Calculate average verbal score
from the whole file
{
int sum = 0;
for(int i = 0; i < verbalScore.size(); i++)
sum += verbalScore.get(i);
return sum/verbalScore.size();
}
public static int AverageMathScore()//Calculate average math score from
the whole file
{
int sum = 0;
for(int i = 0; i < mathScore.size(); i++)
sum += mathScore.get(i);
return sum/mathScore.size();
}
public static int AverageCombinedScore()//Calculate average total Score
from the whole file
{
int sum = 0;
for(int i = 0; i < totalScore.size(); i++)
sum += totalScore.get(i);
return sum/totalScore.size();
}
public void HighestCombined(int studentID)//Method to find highest
score of an inputed student ID number
{
int rowNumber[]=new int[100];
int i = 0;
int bestTotalScore = 0;
if(studentIDNumber.contains(studentID))
{
rowNumber[i] = studentIDNumber.indexOf(studentID);
for(int j = 0; j < 10; j++)
{
if(studentIDNumber.get(studentIDNumber.indexOf(studentID) + j + 1 ) == studentID)
{
i++;
rowNumber[i] = studentIDNumber.indexOf(studentID) + j + 1;
}
}
for(i = 0; i < rowNumber.length; i++)
{
if(rowNumber[i] >= 1 )
{
if(totalScore.get(rowNumber[i]) > bestTotalScore)
{
bestTotalScore = totalScore.get(rowNumber[i]);
}
}
}
System.out.println("The highest superscore for student ID " + studentID + " is: " + bestTotalScore);
}
else
{
System.out.println("Student ID does not exist");
}
}
public static int HighestVerbal()// Highest verbal score method
{
int highest = verbalScore.get(0);
for (int i = 0; i < verbalScore.size(); i++)
{
if (highest < verbalScore.get(i))
highest = verbalScore.get(i);
}
return highest;
}
public static int LowestMath()//Lowest math score method
{
int lowest = mathScore.get(0);
for(int i = 1; i < mathScore.size(); i++)
{
if (mathScore.get(i) < lowest)
lowest = mathScore.get(i);
}
return lowest;
}
public static int UniqueTest() //Method that compares each student ID
to see how many times the student took the test
{
int count = 0;
for (int i = 0; i < studentIDNumber.size()-1;i++)
{
boolean found = false;
for (int j = i+1; !found && j < studentIDNumber.size(); j++)
{
if (studentIDNumber.get(i).equals(studentIDNumber.get(j)))
{
found = true;
count++;
}
}
}
return (studentIDNumber.size()-count);
}
public void toString(int studentID)// to String method
{
int rowNumber[]=new int[3];
int i = 0;
int highestMathScore = 0;
int highestVerbalScore = 0;
int bestTotalScore = 0;
if(studentIDNumber.contains(studentID))
{
rowNumber[i] = studentIDNumber.indexOf(studentID);
for(int j = 0; j < 10; j++)
{
if(studentIDNumber.get(studentIDNumber.indexOf(studentID) + j + 1 ) == studentID)
{
i++;
rowNumber[i] = studentIDNumber.indexOf(studentID) + j + 1;
}
}
System.out.println("Evidence-Based Reading and Writing Section | Math Section | Total Score" );// Printing out the selected students scores
for(i = 0; i < rowNumber.length; i++)
{
if(rowNumber[i] >= 1 )
{
if(mathScore.get(rowNumber[i]) > highestMathScore)// if math score at position i is greater than highest math score, than it is equal to that math score
{
highestMathScore = mathScore.get(rowNumber[i]);
}
if(verbalScore.get(rowNumber[i]) > highestVerbalScore)//if verbal score at position i is greater than highest verbal, than it is equal to that verbal score
{
highestVerbalScore = verbalScore.get(rowNumber[i]);
}
if(totalScore.get(rowNumber[i]) > bestTotalScore)//if total score ar position i is greater than best total score, than it is equal to that score
{
bestTotalScore = totalScore.get(rowNumber[i]);
}
System.out.println(verbalScore.get(rowNumber[i]) + " | " + mathScore.get(rowNumber[i]) + " | " + totalScore.get(rowNumber[i]));
}
}
System.out.println("Highest Math Score: " + highestMathScore);
System.out.println("Highest Verbal Score: " + highestVerbalScore);
System.out.println("Best Total Score: " + bestTotalScore);
}
else
{
System.out.println("Student ID does not exist");
}
}
}
任何帮助将不胜感激。