Thread: error string index out of range

hello everybody
i write a code but it show a error message
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String ind
ex out of range: 10
at java.lang.String.charAt(String.java:658)
at StringChar.main(StringChar.java:11)

plz help me and this is my first post in this forum

class StringChar{
 
	public static void main(String ss[]){
 
		String str="HelloWorld";
		int a;
		System.out.println("String is = " + str);
		a=str.length();
		System.out.println("String is After Reverse");
		for(int i=a;i>=0;i--)
			System.out.print(str.charAt(i));
	}
}

The max index is the array length-1. The code needs to set its starting index to the max value(length-1), not the length of the array.

Please edit your post and wrap your code with code tags:
[code=java]
YOUR CODE GOES HERE
[/code]
to get highlighting and preserve formatting.