How can I write a method that will check if the letters in a string are all the same?

public boolean allSameLetter(String str) {

}

Answer 1

[Geoff Hayes]

George - use the unique function to find the unique characters in the string. If there is only one unique character then you know that all letters are the same

 function [bAllSame] = allSameLetter(str)

 bAllSame = length(unique(str))==1;

Answer 2

[Stephen23]

Using diff would be much faster than unique:

>> str = 'aba';
>> any(diff(+str))
ans =  1
>> str = 'aaa';
>> any(diff(+str))
ans = 0

Answer 3

[Image Analyst]

Another way is to use the diff function:

allTheSame = all(diff(str)==0)

Answer 4

[Walter Roberson]

First you have to show us your String class. MATLAB does not have a String class.

It looks to me that you are asking homework questions about a different programming language.

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer