arrayOutOfBounds异常java

我想解析一个文本文件，并根据addToTree方法中指定的规则从中构建一个树。但是，我遇到了以下错误：

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at ie.gmit.TreeTest.addToTree(TreeTest.java:27)
at ie.gmit.TreeTest.parse(TreeTest.java:20)
at ie.gmit.TreeTest.main(TreeTest.java:77)

addChar1和addChar2是我通过在parse方法中传入单词创建的节点

代码如下：

public class TreeTest {

public void parse(File f) throws Exception {
    Node root = new  Node('+'); //create a root node
    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(f)));

    String line;
    while((line = br.readLine())!=null){
        String[] words = line.toLowerCase().split(" ");

        for(int i = 0; i < words.length; i++){
            addToTree(words[i], root);
        }
    }
}

public void addToTree(String s, Node root){
    char[] characters = s.toCharArray();
    Node addChar1 = new Node(characters[0]);
    Node addChar2 = new Node(characters[1]);
    Node fullWord = new Node(s);

    //get the child nodes of the root
    Node[] rootChildren = root.children();
    //get the child nodes of the first node (addChar1)
    Node[] addChar1Children = addChar1.children();

    //get each child of the root
    for(int i=0; i<rootChildren.length; i++){
        Node rootChild = rootChildren[i];
        //see if the addChar1 already exists in the tree
        //if it doesn't
        if(!rootChild.equals(addChar1)){
            //add the addChar1 as a child of the root
            root.addChild(addChar1);
            //add the addChar2 as a child of the addChar1 also
            addChar1.addChild(addChar2);
            //insert the whole word as the child of the addChar2
            addChar2.addChild(fullWord);
        }
        //if the addChar1 exists in the tree already
        else{
            // get each child of the addChar1
            for(int j=0; j<addChar1Children.length; j++){
                Node addChar1Child = addChar1Children[i];
                //see if the addChar2 already exists in the tree
                //if it doesn't
                if(!addChar1Child.equals(addChar2)){
                    //add the addChar2 as the child if the addChar1
                    addChar1.addChild(addChar2);
                    //add the actual word
                    addChar2.addChild(fullWord);
                }
                //if the addChar2 exists the the tree already
                else{
                    //insert the whole word as the child of the FOUND NODE
                    addChar1Child.addChild(fullWord);
                }
            }//end of second for loop
        }
    }//end of the first for loop

}//end of addToTree

 public static void main(String[] args) throws Exception {
     TreeTest test = new TreeTest();

     File f = new File("textFile.txt");
     test.parse(f);
 }

公共类树测试{
公共void解析（文件f）引发异常{
节点根=新节点（“+”）；//创建根节点
BufferedReader br=新的BufferedReader（新的InputStreamReader（新文件InputStream（f））；
弦线；
而（（line=br.readLine（））！=null）{
String[]words=line.toLowerCase（）.split（“”）；
for（int i=0；i

}检查这一行（27）：

---

正在传递的

字符串是否包含任何字符？请检查输入文件中是否没有空行。
在访问索引0和1之前，您可能应该检查它们：

if (!s.isEmpty()) {
       char[] characters = s.toCharArray();
       Node addChar1 = new Node(characters[0]);
       Node addChar2 = new Node(characters[1]);
...

显然，您有一些空字符串。
当您使用此代码时

Node addChar1 = new Node(characters[0]);
Node addChar2 = new Node(characters[1]);

在访问索引元素之前，您应该检查字符数组的大小。当字符数组大小小于2时，您将获得ArrayIndexOutOfBoundsException
char[]characters=s.ToCharray（）；//检查字符数组长度，然后写入字符[1]
您确定您的流程没有从输入文件中提取空字符串吗？明显的罪魁祸首是您假设输入字符串的长度均大于等于2。实际上，文件中的所有单词的长度均大于等于2length@ciastkoo-文件中的所有单词长度可能大于等于2，但您仍然可以从文件中提取空字符串，取决于您的操作方式。您可能需要检查方法中输入字符串的长度，以确保。@Perception您能解释一下我如何提取空字符串吗？@ciastkoo您的输入文件中有空行吗？该文件不包含纵向为3+的单词，您说它不包含纵向为3+的单词长度。空单词或有1或2个字符的单词怎么样？
if (!s.isEmpty()) {
       char[] characters = s.toCharArray();
       Node addChar1 = new Node(characters[0]);
       Node addChar2 = new Node(characters[1]);
...

Node addChar1 = new Node(characters[0]);
Node addChar2 = new Node(characters[1]);