java引发异常java.lang.IndexOutOfBoundsException:

我正在创建一个程序，它接受一系列数字，并将这些数字的最小对相加。失败的代码如下所示：

import java.util.*;

public class Library {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        String answer;
        int count;
        int books;
        int writers;
        List<Integer> booksList = new LinkedList<>();
        System.out.printf("Numbers: ");

        answer = input.nextLine();
        String[] arr = answer.split(" ");

        for (String num : arr) {
            booksList.add(Integer.parseInt(num));
        }

        books = booksList.remove(0);
        writers = booksList.remove(0);

        while (booksList.size() > writers) {
            mergeMinimalPair(booksList);
        }
    }

    public static void mergeMinimalPair(List<Integer> books) {  
        int index = 0;
        int minValue = books.get(0) + books.get(1);

        for (int i = 1; i <= books.size() - 1; i++){
            if ((books.get(i) + books.get(i + 1)) < minValue){
                index = i;
                minValue = books.get(i) + books.get(i + 1);
            }
        }
        //combine(books, index, index + 1);
    }

如何避免此异常？

在代码中

for (int i = 1; i <= books.size() - 1; i++){
    if ((books.get(i) + books.get(i + 1)

问题在于：

for (int i = 1; i <= books.size() - 1; i++){
    if ((books.get(i) + books.get(i + 1)) < minValue){
        index = i;
        minValue = books.get(i) + books.get(i + 1);
    }
}

---

循环从

1

到

books.size（）-1

，而不是从

0

到

books.size（）-2

。在Java中，数组和集合索引总是从0（包含）到大小（排除）

for (int i = 1; i < books.size() - 1; i++){

for (int i = 1; i <= books.size() - 1; i++){
    if ((books.get(i) + books.get(i + 1)) < minValue){
        index = i;
        minValue = books.get(i) + books.get(i + 1);
    }
}

for (int i = 1; i < books.size() - 1; i++){
    if ((books.get(i) + books.get(i + 1)) < minValue){
        index = i;
        minValue = books.get(i) + books.get(i + 1);
    }
}