Java字符串拆分给出数组索引越界错误

Question

我今天遇到了这个不寻常的错误。谁能解释我做错了什么。下面是代码:

AreStringsPermuted checkStringPerObj = new AreStringsPermuted();
String[] inputStrings = {"siddu$isdud", "siddu$siddarth", "siddu$sidde"};
for(String inputString : inputStrings){
    String[] stringArray = inputString.split("$");
    if(checkStringPerObj.areStringsPermuted(stringArray[0],stringArray[1]))
            System.out.println("Strings : " + stringArray[0] + " ," + stringArray[1] + " are permuted");
    else
            System.out.println("Strings : " + stringArray[0] + " ," + stringArray[1] + " are not permuted");
        }

当我尝试拆分字符串时，上面的代码出错了。出于某种原因，当我尝试使用“$”划分每个字符串时，split 不起作用。谁能解释一下我在这里做错了什么？

错误信息如下:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
    at arraysAndStrings.TestClass.checkStringsPermuted(TestClass.java:24)
    at arraysAndStrings.TestClass.main(TestClass.java:43)

Answer 1

String.split() takes a regular expression , 因此您需要引用包含在正则表达式中具有特殊含义的字符的字符串。

String regularExpression = Pattern.quote("$");
for (String inputString : inputStrings) {
  String[] stringArray = inputString.split(regularExpression);