Java indexOf method for multiple matches in String

Question

I had a question about the indexOf method. I want to find multiple cases of "X" in a string.

Suppose my string is "x is x is x is x", I want to find x in all of its index positions. But how do you do this for multiple cases? Is this even possible with indexOf?

I did int temp = str.indexOf('x'); It find the first x. I tried to do a for loop where i is initialized to length of string and this did not work since I kept finding the first x over and over.

for (int y = temp1; y >= 0;y-- )  {     int temp = str.indexOf('x');     System.out.println(temp); } 

But this does not work. Am I supposed to use regex? Because I don't really know how to use regex method.

Any help would be appreciated, thanks!

Answer 1

There is a second variant of the indexOf method, which takes a start-index as a parameter.

i = str.indexOf('x'); while(i >= 0) {      System.out.println(i);      i = str.indexOf('x', i+1); } 

Answer 2

There's a another version of indexOf method, taking fromIndex as parameter.
So, you can call it in a loop, each time passing prevPosition + 1 as a second parameter.

Documentation:
http://download.oracle.com/javase/6/docs/api/java/lang/String.html#indexOf(int, int)