Isomorphic Strings LeetCode solution in Java

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class Solution {
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  public boolean isIsomorphic(String s, String t) {
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    ArrayList<Integer> list1 = new ArrayList<>();
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    ArrayList<Integer> list2 = new ArrayList<>();
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    for (int i = 0; i < s.length(); i++) {
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      list1.add(s.lastIndexOf(s.charAt(i)));
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      list2.add(t.lastIndexOf(t.charAt(i)));
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    }
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    if (list1.equals(list2)) {
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      return true;
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    } else {
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      return false;
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    }
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  }
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}