Need help eliminating multiples letters

[blinksumgreen]

I came up with the following, but I need some help with the logic. I think the problems lie in two main areas:

1. If you delete an item, the size will change but won't be able to update the loop.
2. Even if I do a test run with a word that has no repeating letters, such as "hey", where the length will definitely not change, it still prints out an incorrect statement.

public void removeMultiples(String x) {

        String keyword = x;
        StringBuffer sb, temp;

        sb = new StringBuffer(keyword);

        // reverses the keyword so that multiple letters are removed
        // from the end, not the beginning
        temp = sb.reverse();

        for (int i = 0; i < temp.length(); i++) {

            for (int j = 1; j < temp.length(); j++) {

                char y = temp.charAt(i);
                char z = temp.charAt(j);

                // if what is at location y and z match, remove what is at z
                if(y == z){
                    temp.deleteCharAt(j);
                }
            }
        }

        // corrects the orientation of the keyword
        sb = temp.reverse();

        System.out.println(sb);
    }