loop through a string

Hello,
I am new to Java and wanted to get your thoughts on the best way to validate that all numbers in a string are not the same.
Any assistance would be greatly appreciated.

need your help to understand the problem. What kind of "numbers" does a string contain? What else does the string contain?

Hello,
Thank you for responding to my post. The string will contain numeric numbers. For example (88888). I want to validation that will determine if all numbers in the string are the same. Does this make sense?

Assuming the string is not null, and contains nothing but numeric numbers
public boolean test(String s) {
if(s.length()<2) return true;
char t = s.charAt(0);
for(int i = 1; i<s.length(); ++i) {
if(t!=s.charAt(i)) return false;
}
return true;
}

I would not say it's "the best", but it will do...

Thanks Dmitry!
I really appreciate your help.