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Thread: String index out of bounds error 5???

  1. #1
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    Default String index out of bounds error 5???

    hey, im working on a program that tests to see if a string is a palindrome or not. It has to remove all characters and spaces.
    Heres the program:
    import java.util.*;
     
    public class PalindromeTester
    {
    	public static void main(String[]args)
    	{
    	String str,another="y";
    	int left,right;
     
     
    	Scanner scan=new Scanner(System.in);
     
    		while(another.equalsIgnoreCase("y"))
    		{
    		System.out.println("enter a potential palindrome: ");
    		str=scan.nextLine();
     
    		str=str.replaceAll("!"," ");
    		str=str.replaceAll("."," ");	
     
     
     
                   right=str.length();
    		left=0;
     
    		while(str.charAt(left)== str.charAt(right) && left < right)
    		{
     
     
     
    		left++;
    		right--;
     
    		}
     
    		System.out.println();
     
    		if(left<right)
    			System.out.println("That string is NOT a palindrome. ");
     
    		else 
    			System.out.println("That string IS a palindrome");
     
    		System.out.println();
    		System.out.println("Test another palindrome?(y/n)");
    		another=scan.nextLine();
    		}
     
    	}
    }

    It compiles fine, but when i run the program i get this error:

    Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 5
    at java.lang.String.charAt(String.java:686)
    at PalindromeTester.main(PalindromeTester.java:26)

    What does this mean? and one other question. If i use the string.replaceAll() method, can i replace it with nothing by doing this string.replaceAll("(puntuationmarkshere),"");
    Last edited by helloworld922; September 26th, 2010 at 06:26 PM.


  2. #2
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    Default Re: String index out of bounds error 5???

    It means your Array is only 5 items long, and you are attempting to access Index 5. Since Indexes start at 0, your index range is: 0-4.

  3. #3
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    Default Re: String index out of bounds error 5???

    thank you! i just fixed it im starting to understand these error messages better and better. now what about the second question?

  4. #4
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    Default Re: String index out of bounds error 5???

    Yes you can replace the string with ""

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