Find Resultant Array After Removing Anagrams LeetCode solution in Java

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class Solution {
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  public List<String> removeAnagrams(String[] words) {
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    String prev = "";
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    List<String> li = new ArrayList<>();
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    for (int i = 0; i < words.length; i++) {
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      char[] ch = words[i].toCharArray();
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      Arrays.sort(ch);
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      String curr = String.valueOf(ch);
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      if (!curr.equals(prev)) {
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        li.add(words[i]);
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        prev = curr;
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      }
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    }
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    return li;
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  }
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}