该功能对我来说很好。我已经写了内联评论。希望能帮助到你：
// function takes a char array as input.// modifies it to remove duplicates and adds a 0 to mark the end// of the unique chars in the array.public static void removeDuplicates(char[] str) { if (str == null) return; // if the array does not exist..nothing to do return. int len = str.length; // get the array length. if (len < 2) return; // if its less than 2..can't have duplicates..return. int tail = 1; // number of unique char in the array. // start at 2nd char and go till the end of the array. for (int i = 1; i < len; ++i) { int j; // for every char in outer loop check if that char is already seen. // char in [0,tail) are all unique. for (j = 0; j < tail; ++j) { if (str[i] == str[j]) break; // break if we find duplicate. } // if j reachs tail..we did not break, which implies this char at pos i // is not a duplicate. So we need to add it our "unique char list" // we add it to the end, that is at pos tail. if (j == tail) { str[tail] = str[i]; // add ++tail; // increment tail...[0,tail) is still "unique char list" } } str[tail] = 0; // add a 0 at the end to mark the end of the unique char.}
