My 2ms Java Solution

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    public class Solution {
        //assume: word1 does not equal to word2, and word1 and word2 are both in the list.
        //word in words may the same word
        public int shortestDistance(String[] words, String word1, String word2) {
            //to make the distance in a reasonable range: not overflow
            int index_1 = words.length;
            int index_2 = words.length;
            //set the min distance between two words
            int min = Integer.MAX_VALUE;
            for(int i = 0; i < words.length; i++) {
                    index_1 = i;
                    min = Math.min(min,Math.abs(index_2-index_1));
                else if(words[i].equals(word2)){
                    index_2 = i;
                    min = Math.min(min,Math.abs(index_2-index_1));
            return min;

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