diff --git a/src/main/java/io/github/xxyopen/novel/core/config/CacheConfig.java b/src/main/java/io/github/xxyopen/novel/core/config/CacheConfig.java
index 8a13fbe..5493a94 100644
--- a/src/main/java/io/github/xxyopen/novel/core/config/CacheConfig.java
+++ b/src/main/java/io/github/xxyopen/novel/core/config/CacheConfig.java
@@ -37,7 +37,8 @@ public class CacheConfig {
         SimpleCacheManager cacheManager = new SimpleCacheManager();
 
         List<CaffeineCache> caches = new ArrayList<>(CacheConsts.CacheEnum.values().length);
-        for (CacheConsts.CacheEnum c : CacheConsts.CacheEnum.values()) {
+        // 类型推断 var 非常适合 for 循环，JDK 10 引入，JDK 11 改进
+        for (var c : CacheConsts.CacheEnum.values()) {
             if (c.isLocal()) {
                 Caffeine<Object, Object> caffeine = Caffeine.newBuilder().recordStats().maximumSize(c.getMaxSize());
                 if (c.getTtl() > 0) {
@@ -62,7 +63,8 @@ public class CacheConfig {
                 .disableCachingNullValues().prefixCacheNameWith(CacheConsts.REDIS_CACHE_PREFIX);
 
         Map<String, RedisCacheConfiguration> cacheMap = new LinkedHashMap<>(CacheConsts.CacheEnum.values().length);
-        for (CacheConsts.CacheEnum c : CacheConsts.CacheEnum.values()) {
+        // 类型推断 var 非常适合 for 循环，JDK 10 引入，JDK 11 改进
+        for (var c : CacheConsts.CacheEnum.values()) {
             if (c.isRemote()) {
                 if (c.getTtl() > 0) {
                     cacheMap.put(c.getName(), RedisCacheConfiguration.defaultCacheConfig().disableCachingNullValues()
diff --git a/src/main/java/io/github/xxyopen/novel/service/impl/EsSearchServiceImpl.java b/src/main/java/io/github/xxyopen/novel/service/impl/EsSearchServiceImpl.java
index d977947..271c94f 100644
--- a/src/main/java/io/github/xxyopen/novel/service/impl/EsSearchServiceImpl.java
+++ b/src/main/java/io/github/xxyopen/novel/service/impl/EsSearchServiceImpl.java
@@ -77,7 +77,8 @@ public class EsSearchServiceImpl implements SearchService {
 
         List<BookInfoRespDto> list = new ArrayList<>();
         List<Hit<EsBookDto>> hits = response.hits().hits();
-        for (Hit<EsBookDto> hit : hits) {
+        // 类型推断 var 非常适合 for 循环，JDK 10 引入，JDK 11 改进
+        for (var hit : hits) {
             EsBookDto book = hit.source();
             assert book != null;
             if (!CollectionUtils.isEmpty(hit.highlight().get(EsConsts.BookIndex.FIELD_BOOK_NAME))) {