Arraylist java.lang.IndexOutOfBoundsException:索引 3 超出长度 3 错误 [英] Arraylist java.lang.IndexOutOfBoundsException: Index 3 out of bounds for length 3 Error

问题描述

我创建了一个方法，它采用字符串和整数的 Arraylist.它将删除所有长度小于给定整数的字符串.

I created a method which takes an Arraylist of string and an integer. It's going to remove all string whose length is less than the given integer.

例如:

Arraylist = [abcde"、aabb"、aaabbb"、abc"、ab"]

Arraylist = ["abcde", "aabb", "aaabbb", "abc", "ab"]

整数 = 4

所以新的 Arraylist 应该是:[abcde", aabb", aaabbb"]

So the new Arraylist should be: ["abcde", "aabb", "aaabbb"]

但我收到此错误消息:

线程main"中的异常java.lang.IndexOutOfBoundsException: 索引 3 超出长度 3 的边界

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index 3 out of bounds for length 3

这是我的代码:

public static void main(String[] args){
        ArrayList<String> newArrayList = new ArrayList<>();
        newArrayList.add("string1");
        newArrayList.add("string2");
        newArrayList.add("rem");
        newArrayList.add("dontremove");
        removeElement(newArrayList, 4); // new arraylist must be = [string1, string2, dontremove]
    }


    public static void removeElement(ArrayList<String> arraylist, int inputLen){
        int arrayLen = arraylist.size();
        for(int i=0; i<arrayLen; i++){
            if(arraylist.get(i).length() < inputLen){
                arraylist.remove(i);
                i--;
            }
        }
        System.out.println("New Arraylist: " + arraylist);
    }

这段代码有什么问题?

推荐答案

当你移除元素时，数组的长度应该改变.arrayLen 变量存储数组的长度，但在数组长度缩小时不会改变.要更改它，您应该能够将 arrayLen 替换为 arrayList.size()，这将在您删除元素时更改

The length of the array should change when you remove elements. The arrayLen variable stores the length of the array, but doesn't change when the array's length shrinks. To change it, you should be able to just replace arrayLen with arrayList.size(), which will change when your remove elements

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