diff --git a/problems/0242.有效的字母异位词.md b/problems/0242.有效的字母异位词.md
index be553c5a..6c5a90ce 100644
--- a/problems/0242.有效的字母异位词.md
+++ b/problems/0242.有效的字母异位词.md
@@ -85,7 +85,24 @@ public:
 
 
 Java：
+```java
+public boolean isAnagram(String s, String t) {
+    int[] record = new int[26];
+    for (char c : s.toCharArray()) {
+        record[c - 'a'] += 1;
+    }
+    for (char c : t.toCharArray()) {
+        record[c - 'a'] -= 1;
+    }
+    for (int i : record) {
+        if (i != 0) {
+            return false;
+        }
+    }
+    return true;
+}
 
+```
 
 Python：