java - Arraylist 索引越界

Question

这个问题已经有答案了:

What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? (25 个回答)

已关闭 3 年前。

作业要求读取两个文件，并将学生的信息分别输入到两个ArrayList中。 s。然后我需要执行两个功能:组合两个列表并对组合列表进行排序。

public abstract class Tools {
    public static ArrayList<JUPASStudent> readJUPASFile(String f) throws Exception {
        ArrayList<JUPASStudent> jList = new ArrayList<JUPASStudent>();

        BufferedReader readbuffer = null;
        readbuffer = new BufferedReader(new FileReader(f));
        String strRead;
        while ((strRead = readbuffer.readLine()) != null) {
            String splitarray[] = strRead.split("/t");
            String firstentry = splitarray[0];
            String secondentry = splitarray[1];
            JUPASStudent x = new JUPASStudent(firstentry, Double.parseDouble(secondentry));
            jList.add(x);
        }

        readbuffer.close();
        return jList;
        }

    public static ArrayList<NonJUPASStudent> readNonJUPASFile(String f) throws Exception {
        ArrayList<NonJUPASStudent> njList = new ArrayList<NonJUPASStudent>();

        BufferedReader readbuffer = null;
        readbuffer = new BufferedReader(new FileReader(f));
        String strRead;
        while ((strRead = readbuffer.readLine()) != null) {
            String splitarray[] = strRead.split("/t");
            String firstentry = splitarray[0];
            String secondentry = splitarray[1];
            NonJUPASStudent x = new NonJUPASStudent(firstentry, Double.parseDouble(secondentry));
            njList.add(x);
        }

        readbuffer.close();
        return njList;
    }

    public static ArrayList<Student> combineArrayList(ArrayList<JUPASStudent> S1, ArrayList<NonJUPASStudent> S2) {
        ArrayList<Student> sList = new ArrayList<Student>();

        for (int i = 0; i < S1.size(); i++)
            sList.add(S1.get(i));
        for (int i = 0; i < S2.size(); i++) 
            sList.add(S2.get(i));

        return sList;
    }

    public static ArrayList<Student> sort(ArrayList<Student> s){
        for (int i = 0; i < s.size()-1; i++) {
            for (int j = 0; i < s.size()-i-1; j++) {
                if (s.get(j).getResult() > s.get(j+1).getResult()) {
                    Student Temp = s.get(j);
                    s.set(j, s.get(j+1));
                    s.set(j+1, Temp);
                }
            }
        }
        return s;
    }
}

但是，我不断收到“索引 1 超出长度 1 的范围”

Answer 1

在内部循环中，您定义了对错误计数器的约束。而不是:

for (int j = 0; i < s.size()-i-1; j++)

应该有:

for (int j = 0; j < s.size()-i-1; j++)