[leetcode]Isomorphic Strings

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public class Solution { public boolean isIsomorphic(String s, String t) { if (s.length() != t.length()) return false; HashMap<Character, Character>lookup = new HashMap<Character, Character>(); HashMap<Character, Character>lookup2 = new HashMap<Character, Character>(); for (int i = 0; i < s.length(); i++){ char c1 = s.charAt(i); char c2 = t.charAt(i); if (lookup.containsKey(c1) && lookup.get(c1) != c2) return false; if (lookup2.containsKey(c2) && lookup2.get(c2) != c1) return false; lookup.put(c1, c2); lookup2.put(c2,c1); } return true; } }