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I am writing a java program to use a for loop and substrings to return a palindrome, but I'm confused on what to put in the substring?

This is the code I used, and the error I received:

String str2 = "";
for(int k = 2; k < sentence.length(); k++)
{
    String str3 = "";
    str3 = str2.substring(k , sentence.length()-1);
......

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: begin 2, end 22, length 0

Does anyone know how to fix this? I believe the issue is in the substring.

Abra
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Paul Mayrion
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1 Answers1

0

The variable str2 is an empty string, so when you call str2.substring(k, sentence.length()-1), it is trying to extract a substring from an index that does not exist, resulting in a StringIndexOutOfBoundsException.

Here str2 is of no use. And it looks like you are trying to extract a substring from the variable sentence using the variable k as the starting index and sentence.length()-1 as the ending index.

for(int k = 0; k < sentence.length(); k++){
  String subString = sentence.substring(k, sentence.length());
  if(isPalindrome(subString)) {
    // do something
  }
}
Kiran Kandel
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