From ce267958499be2d7bead140724518776560decb4 Mon Sep 17 00:00:00 2001
From: wangsiyuan <2392948297@qq.com>
Date: Mon, 4 Sep 2023 18:39:55 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=20Solution.java?=
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---
 src/Solution.java | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/Solution.java b/src/Solution.java
index 046213d..3cc3e06 100644
--- a/src/Solution.java
+++ b/src/Solution.java
@@ -1,2 +1,15 @@
+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;
+    }
 }