删除 Solution.java

src/Solution.java

@@ -1,15 +0,0 @@
-import java.util.HashSet;
-import java.util.Set;
-
-public class Solution {
-    public int lengthOfLongestSubstring(String s) {
-        if (s != null){
-            Set<Character> stringList = new HashSet<>();
-            for (int i = 0; i < s.length(); i++) {
-                stringList.add(s.charAt(i));
-            }
-            return stringList.size();
-        }
-        return 0;
-    }
-}