diff --git a/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java b/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java
index 5e1fcefb3..b11d08d2f 100644
--- a/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/stream/CollectorUtil.java
@@ -24,7 +24,7 @@ public class CollectorUtil {
 	 * 说明已包含IDENTITY_FINISH特征 为 Characteristics.IDENTITY_FINISH 的缩写
 	 */
 	public static final Set<Collector.Characteristics> CH_ID
-		= Collections.unmodifiableSet(EnumSet.of(Collector.Characteristics.IDENTITY_FINISH));
+			= Collections.unmodifiableSet(EnumSet.of(Collector.Characteristics.IDENTITY_FINISH));
 	/**
 	 * 说明不包含IDENTITY_FINISH特征
 	 */
@@ -50,7 +50,7 @@ public class CollectorUtil {
 	 * @return {@link Collector}
 	 */
 	public static <T> Collector<T, ?, String> joining(final CharSequence delimiter,
-		final Function<T, ? extends CharSequence> toStringFunc) {
+													  final Function<T, ? extends CharSequence> toStringFunc) {
 		return joining(delimiter, StrUtil.EMPTY, StrUtil.EMPTY, toStringFunc);
 	}
 
@@ -65,15 +65,15 @@ public class CollectorUtil {
 	 * @return {@link Collector}
 	 */
 	public static <T> Collector<T, ?, String> joining(final CharSequence delimiter,
-		final CharSequence prefix,
-		final CharSequence suffix,
-		final Function<T, ? extends CharSequence> toStringFunc) {
+													  final CharSequence prefix,
+													  final CharSequence suffix,
+													  final Function<T, ? extends CharSequence> toStringFunc) {
 		return new SimpleCollector<>(
-			() -> new StringJoiner(delimiter, prefix, suffix),
-			(joiner, ele) -> joiner.add(toStringFunc.apply(ele)),
-			StringJoiner::merge,
-			StringJoiner::toString,
-			Collections.emptySet()
+				() -> new StringJoiner(delimiter, prefix, suffix),
+				(joiner, ele) -> joiner.add(toStringFunc.apply(ele)),
+				StringJoiner::merge,
+				StringJoiner::toString,
+				Collections.emptySet()
 		);
 	}
 
@@ -92,8 +92,8 @@ public class CollectorUtil {
 	 * @return {@link Collector}
 	 */
 	public static <T, K, D, A, M extends Map<K, D>> Collector<T, ?, M> groupingBy(final Function<? super T, ? extends K> classifier,
-		final Supplier<M> mapFactory,
-		final Collector<? super T, A, D> downstream) {
+																				  final Supplier<M> mapFactory,
+																				  final Collector<? super T, A, D> downstream) {
 		final Supplier<A> downstreamSupplier = downstream.supplier();
 		final BiConsumer<A, ? super T> downstreamAccumulator = downstream.accumulator();
 		final BiConsumer<Map<K, A>, T> accumulator = (m, t) -> {
@@ -131,9 +131,8 @@ public class CollectorUtil {
 	 * @param <A>        下游操作在进行中间操作时对应类型
 	 * @return {@link Collector}
 	 */
-	public static <T, K, A, D>
-	Collector<T, ?, Map<K, D>> groupingBy(final Function<? super T, ? extends K> classifier,
-		final Collector<? super T, A, D> downstream) {
+	public static <T, K, A, D> Collector<T, ?, Map<K, D>> groupingBy(final Function<? super T, ? extends K> classifier,
+										  final Collector<? super T, A, D> downstream) {
 		return groupingBy(classifier, HashMap::new, downstream);
 	}
 
@@ -145,8 +144,7 @@ public class CollectorUtil {
 	 * @param <K>        实体中的分组依据对应类型，也是Map中key的类型
 	 * @return {@link Collector}
 	 */
-	public static <T, K> Collector<T, ?, Map<K, List<T>>>
-	groupingBy(final Function<? super T, ? extends K> classifier) {
+	public static <T, K> Collector<T, ?, Map<K, List<T>>> groupingBy(final Function<? super T, ? extends K> classifier) {
 		return groupingBy(classifier, Collectors.toList());
 	}
 
@@ -161,10 +159,9 @@ public class CollectorUtil {
 	 * @param <U>           map中value的类型
 	 * @return 对null友好的 toMap 操作的 {@link Collector}实现
 	 */
-	public static <T, K, U>
-	Collector<T, ?, Map<K, U>> toMap(final Function<? super T, ? extends K> keyMapper,
-		final Function<? super T, ? extends U> valueMapper,
-		final BinaryOperator<U> mergeFunction) {
+	public static <T, K, U> Collector<T, ?, Map<K, U>> toMap(final Function<? super T, ? extends K> keyMapper,
+									 final Function<? super T, ? extends U> valueMapper,
+									 final BinaryOperator<U> mergeFunction) {
 		return toMap(keyMapper, valueMapper, mergeFunction, HashMap::new);
 	}
 
@@ -183,11 +180,11 @@ public class CollectorUtil {
 	 */
 	public static <T, K, U, M extends Map<K, U>>
 	Collector<T, ?, M> toMap(final Function<? super T, ? extends K> keyMapper,
-		final Function<? super T, ? extends U> valueMapper,
-		final BinaryOperator<U> mergeFunction,
-		final Supplier<M> mapSupplier) {
+							 final Function<? super T, ? extends U> valueMapper,
+							 final BinaryOperator<U> mergeFunction,
+							 final Supplier<M> mapSupplier) {
 		final BiConsumer<M, T> accumulator
-			= (map, element) -> map.put(Opt.ofNullable(element).map(keyMapper).get(), Opt.ofNullable(element).map(valueMapper).get());
+				= (map, element) -> map.put(Opt.ofNullable(element).map(keyMapper).get(), Opt.ofNullable(element).map(valueMapper).get());
 		return new SimpleCollector<>(mapSupplier, accumulator, mapMerger(mergeFunction), CH_ID);
 	}
 
@@ -233,13 +230,13 @@ public class CollectorUtil {
 	 */
 	public static <K, V, R extends Map<K, List<V>>> Collector<Map<K, V>, ?, R> reduceListMap(final Supplier<R> mapSupplier) {
 		return Collectors.reducing(mapSupplier.get(), value -> {
-				R result = mapSupplier.get();
-				value.forEach((k, v) -> result.computeIfAbsent(k, i -> new ArrayList<>()).add(v));
-				return result;
-			}, (l, r) -> {
-				r.forEach((k, v) -> l.computeIfAbsent(k, i -> new ArrayList<>()).addAll(v));
-				return l;
-			}
+					final R result = mapSupplier.get();
+					value.forEach((k, v) -> result.computeIfAbsent(k, i -> new ArrayList<>()).add(v));
+					return result;
+				}, (l, r) -> {
+					r.forEach((k, v) -> l.computeIfAbsent(k, i -> new ArrayList<>()).addAll(v));
+					return l;
+				}
 		);
 	}
 
@@ -254,7 +251,7 @@ public class CollectorUtil {
 	 * @return 收集器
 	 */
 	public static <T, K, V> Collector<T, List<T>, EntryStream<K, V>> toEntryStream(
-		Function<? super T, ? extends K> keyMapper, Function<? super T, ? extends V> valueMapper) {
+			final Function<? super T, ? extends K> keyMapper, final Function<? super T, ? extends V> valueMapper) {
 		Objects.requireNonNull(keyMapper);
 		Objects.requireNonNull(valueMapper);
 		return transform(ArrayList::new, list -> EntryStream.of(list, keyMapper, valueMapper));
@@ -287,11 +284,14 @@ public class CollectorUtil {
 	 * @return 收集器
 	 */
 	public static <T, R, C extends Collection<T>> Collector<T, C, R> transform(
-		Supplier<C> collFactory, Function<C, R> mapper) {
+			final Supplier<C> collFactory, final Function<C, R> mapper) {
 		Objects.requireNonNull(collFactory);
 		Objects.requireNonNull(mapper);
 		return new SimpleCollector<>(
-			collFactory, C::add, (l1, l2) -> { l1.addAll(l2); return l1; }, mapper, CH_NOID
+				collFactory, C::add, (l1, l2) -> {
+			l1.addAll(l2);
+			return l1;
+		}, mapper, CH_NOID
 		);
 	}
 
@@ -309,7 +309,7 @@ public class CollectorUtil {
 	 * @param <T>    输入元素类型
 	 * @return 收集器
 	 */
-	public static <T, R> Collector<T, List<T>, R> transform(Function<List<T>, R> mapper) {
+	public static <T, R> Collector<T, List<T>, R> transform(final Function<List<T>, R> mapper) {
 		return transform(ArrayList::new, mapper);
 	}
 
diff --git a/hutool-core/src/main/java/cn/hutool/core/stream/EasyStream.java b/hutool-core/src/main/java/cn/hutool/core/stream/EasyStream.java
index 5de688e5c..8e2319b2d 100644
--- a/hutool-core/src/main/java/cn/hutool/core/stream/EasyStream.java
+++ b/hutool-core/src/main/java/cn/hutool/core/stream/EasyStream.java
@@ -462,6 +462,7 @@ public class EasyStream<T> extends StreamWrapper<T, EasyStream<T>> implements St
 	/**
 	 * 返回与指定函数将元素作为参数执行后组成的流。操作带下标，并行流时下标永远为-1
 	 * 这是一个无状态中间操作
+	 *
 	 * @param action 指定的函数
 	 * @return 返回叠加操作后的FastStream
 	 * @apiNote 该方法存在的意义主要是用来调试
@@ -475,12 +476,12 @@ public class EasyStream<T> extends StreamWrapper<T, EasyStream<T>> implements St
 	 * 				.collect(Collectors.toList());
 	 * }</pre>
 	 */
-	public EasyStream<T> peekIdx(BiConsumer<? super T, Integer> action) {
+	public EasyStream<T> peekIdx(final BiConsumer<? super T, Integer> action) {
 		Objects.requireNonNull(action);
 		if (isParallel()) {
 			return peek(e -> action.accept(e, NOT_FOUND_INDEX));
 		} else {
-			AtomicInteger index = new AtomicInteger(NOT_FOUND_INDEX);
+			final AtomicInteger index = new AtomicInteger(NOT_FOUND_INDEX);
 			return peek(e -> action.accept(e, index.incrementAndGet()));
 		}
 	}
@@ -688,7 +689,7 @@ public class EasyStream<T> extends StreamWrapper<T, EasyStream<T>> implements St
 	 * @return 实现类
 	 */
 	@Override
-	protected EasyStream<T> convertToStreamImpl(Stream<T> stream) {
+	protected EasyStream<T> convertToStreamImpl(final Stream<T> stream) {
 		return new EasyStream<>(stream);
 	}
 
@@ -852,10 +853,10 @@ public class EasyStream<T> extends StreamWrapper<T, EasyStream<T>> implements St
 	 * eg:
 	 * {@code List studentTree = EasyStream.of(students).toTree(Student::getId, Student::getParentId, Student::setChildren) }
 	 */
-	public <R extends Comparable<R>> List<T> toTree(Function<T, R> idGetter,
-													Function<T, R> pIdGetter,
-													BiConsumer<T, List<T>> childrenSetter) {
-		Map<R, List<T>> pIdValuesMap = group(pIdGetter);
+	public <R extends Comparable<R>> List<T> toTree(final Function<T, R> idGetter,
+													final Function<T, R> pIdGetter,
+													final BiConsumer<T, List<T>> childrenSetter) {
+		final Map<R, List<T>> pIdValuesMap = group(pIdGetter);
 		return getChildrenFromMapByPidAndSet(idGetter, childrenSetter, pIdValuesMap, pIdValuesMap.get(null));
 	}
 
@@ -873,12 +874,12 @@ public class EasyStream<T> extends StreamWrapper<T, EasyStream<T>> implements St
 	 * {@code List studentTree = EasyStream.of(students).toTree(Student::getId, Student::getParentId, Student::setChildren, Student::getMatchParent) }
 	 */
 
-	public <R extends Comparable<R>> List<T> toTree(Function<T, R> idGetter,
-													Function<T, R> pIdGetter,
-													BiConsumer<T, List<T>> childrenSetter,
-													Predicate<T> parentPredicate) {
-		List<T> list = toList();
-		List<T> parents = EasyStream.of(list).filter(e ->
+	public <R extends Comparable<R>> List<T> toTree(final Function<T, R> idGetter,
+													final Function<T, R> pIdGetter,
+													final BiConsumer<T, List<T>> childrenSetter,
+													final Predicate<T> parentPredicate) {
+		final List<T> list = toList();
+		final List<T> parents = EasyStream.of(list).filter(e ->
 						// 此处是为了适配 parentPredicate.test空指针 情况
 						// 因为Predicate.test的返回值是boolean，所以如果 e -> null 这种返回null的情况，会直接抛出NPE
 						Opt.ofTry(() -> parentPredicate.test(e)).filter(Boolean::booleanValue).isPresent())
@@ -897,13 +898,13 @@ public class EasyStream<T> extends StreamWrapper<T, EasyStream<T>> implements St
 	 * @param <R>            此处是id的泛型限制
 	 * @return list 组装好的树
 	 */
-	private <R extends Comparable<R>> List<T> getChildrenFromMapByPidAndSet(Function<T, R> idGetter,
-																			BiConsumer<T, List<T>> childrenSetter,
-																			Map<R, List<T>> pIdValuesMap,
-																			List<T> parents) {
-		MutableObj<Consumer<List<T>>> recursiveRef = new MutableObj<>();
-		Consumer<List<T>> recursive = values -> EasyStream.of(values, isParallel()).forEach(value -> {
-			List<T> children = pIdValuesMap.get(idGetter.apply(value));
+	private <R extends Comparable<R>> List<T> getChildrenFromMapByPidAndSet(final Function<T, R> idGetter,
+																			final BiConsumer<T, List<T>> childrenSetter,
+																			final Map<R, List<T>> pIdValuesMap,
+																			final List<T> parents) {
+		final MutableObj<Consumer<List<T>>> recursiveRef = new MutableObj<>();
+		final Consumer<List<T>> recursive = values -> EasyStream.of(values, isParallel()).forEach(value -> {
+			final List<T> children = pIdValuesMap.get(idGetter.apply(value));
 			childrenSetter.accept(value, children);
 			recursiveRef.get().accept(children);
 		});
@@ -922,9 +923,9 @@ public class EasyStream<T> extends StreamWrapper<T, EasyStream<T>> implements St
 	 * eg:
 	 * {@code List students = EasyStream.of(studentTree).flatTree(Student::getChildren, Student::setChildren).toList() }
 	 */
-	public EasyStream<T> flatTree(Function<T, List<T>> childrenGetter, BiConsumer<T, List<T>> childrenSetter) {
-		MutableObj<Function<T, EasyStream<T>>> recursiveRef = new MutableObj<>();
-		Function<T, EasyStream<T>> recursive = e -> EasyStream.of(childrenGetter.apply(e)).flat(recursiveRef.get()).unshift(e);
+	public EasyStream<T> flatTree(final Function<T, List<T>> childrenGetter, final BiConsumer<T, List<T>> childrenSetter) {
+		final MutableObj<Function<T, EasyStream<T>>> recursiveRef = new MutableObj<>();
+		final Function<T, EasyStream<T>> recursive = e -> EasyStream.of(childrenGetter.apply(e)).flat(recursiveRef.get()).unshift(e);
 		recursiveRef.set(recursive);
 		return flat(recursive).peek(e -> childrenSetter.accept(e, null));
 	}
diff --git a/hutool-core/src/main/java/cn/hutool/core/stream/StreamWrapper.java b/hutool-core/src/main/java/cn/hutool/core/stream/StreamWrapper.java
index 60da8e88d..558dd7d42 100644
--- a/hutool-core/src/main/java/cn/hutool/core/stream/StreamWrapper.java
+++ b/hutool-core/src/main/java/cn/hutool/core/stream/StreamWrapper.java
@@ -22,7 +22,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 *
 	 * @param stream 包装的流对象
 	 */
-	protected StreamWrapper(Stream<T> stream) {
+	protected StreamWrapper(final Stream<T> stream) {
 		Objects.requireNonNull(stream, "stream must not null");
 		this.stream = stream;
 	}
@@ -35,7 +35,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 返回叠加过滤操作后的流
 	 */
 	@Override
-	public I filter(Predicate<? super T> predicate) {
+	public I filter(final Predicate<? super T> predicate) {
 		return convertToStreamImpl(stream.filter(predicate));
 	}
 
@@ -47,7 +47,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 叠加操作后元素类型全为int的流
 	 */
 	@Override
-	public IntStream mapToInt(ToIntFunction<? super T> mapper) {
+	public IntStream mapToInt(final ToIntFunction<? super T> mapper) {
 		return stream.mapToInt(mapper);
 	}
 
@@ -59,7 +59,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 叠加操作后元素类型全为long的流
 	 */
 	@Override
-	public LongStream mapToLong(ToLongFunction<? super T> mapper) {
+	public LongStream mapToLong(final ToLongFunction<? super T> mapper) {
 		return stream.mapToLong(mapper);
 	}
 
@@ -71,7 +71,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 叠加操作后元素类型全为double的流
 	 */
 	@Override
-	public DoubleStream mapToDouble(ToDoubleFunction<? super T> mapper) {
+	public DoubleStream mapToDouble(final ToDoubleFunction<? super T> mapper) {
 		return stream.mapToDouble(mapper);
 	}
 
@@ -83,7 +83,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 返回叠加拆分操作后的IntStream
 	 */
 	@Override
-	public IntStream flatMapToInt(Function<? super T, ? extends IntStream> mapper) {
+	public IntStream flatMapToInt(final Function<? super T, ? extends IntStream> mapper) {
 		return stream.flatMapToInt(mapper);
 	}
 
@@ -95,7 +95,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 返回叠加拆分操作后的LongStream
 	 */
 	@Override
-	public LongStream flatMapToLong(Function<? super T, ? extends LongStream> mapper) {
+	public LongStream flatMapToLong(final Function<? super T, ? extends LongStream> mapper) {
 		return stream.flatMapToLong(mapper);
 	}
 
@@ -107,7 +107,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 返回叠加拆分操作后的DoubleStream
 	 */
 	@Override
-	public DoubleStream flatMapToDouble(Function<? super T, ? extends DoubleStream> mapper) {
+	public DoubleStream flatMapToDouble(final Function<? super T, ? extends DoubleStream> mapper) {
 		return stream.flatMapToDouble(mapper);
 	}
 
@@ -145,7 +145,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 一个元素按指定的Comparator排序的流
 	 */
 	@Override
-	public I sorted(Comparator<? super T> comparator) {
+	public I sorted(final Comparator<? super T> comparator) {
 		return convertToStreamImpl(stream.sorted(comparator));
 	}
 
@@ -167,7 +167,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * }</pre>
 	 */
 	@Override
-	public I peek(Consumer<? super T> action) {
+	public I peek(final Consumer<? super T> action) {
 		return convertToStreamImpl(stream.peek(action));
 	}
 
@@ -179,7 +179,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 截取后的流
 	 */
 	@Override
-	public I limit(long maxSize) {
+	public I limit(final long maxSize) {
 		return convertToStreamImpl(stream.limit(maxSize));
 	}
 
@@ -191,7 +191,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 丢弃前面n个元素后的剩余元素组成的流
 	 */
 	@Override
-	public I skip(long n) {
+	public I skip(final long n) {
 		return convertToStreamImpl(stream.skip(n));
 	}
 
@@ -202,7 +202,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @param action 操作
 	 */
 	@Override
-	public void forEach(Consumer<? super T> action) {
+	public void forEach(final Consumer<? super T> action) {
 		stream.forEach(action);
 	}
 
@@ -213,7 +213,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @param action 操作
 	 */
 	@Override
-	public void forEachOrdered(Consumer<? super T> action) {
+	public void forEachOrdered(final Consumer<? super T> action) {
 		stream.forEachOrdered(action);
 	}
 
@@ -238,7 +238,8 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @throws ArrayStoreException 如果元素转换失败，例如不是该元素类型及其父类，则抛出该异常
 	 */
 	@Override
-	public <A> A[] toArray(IntFunction<A[]> generator) {
+	public <A> A[] toArray(final IntFunction<A[]> generator) {
+		//noinspection SuspiciousToArrayCall
 		return stream.toArray(generator);
 	}
 
@@ -263,7 +264,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 聚合计算后的值
 	 */
 	@Override
-	public T reduce(T identity, BinaryOperator<T> accumulator) {
+	public T reduce(final T identity, final BinaryOperator<T> accumulator) {
 		return stream.reduce(identity, accumulator);
 	}
 
@@ -298,7 +299,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @see #max(Comparator)
 	 */
 	@Override
-	public Optional<T> reduce(BinaryOperator<T> accumulator) {
+	public Optional<T> reduce(final BinaryOperator<T> accumulator) {
 		return stream.reduce(accumulator);
 	}
 
@@ -315,7 +316,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @see #reduce(Object, BinaryOperator)
 	 */
 	@Override
-	public <U> U reduce(U identity, BiFunction<U, ? super T, U> accumulator, BinaryOperator<U> combiner) {
+	public <U> U reduce(final U identity, final BiFunction<U, ? super T, U> accumulator, final BinaryOperator<U> combiner) {
 		return stream.reduce(identity, accumulator, combiner);
 	}
 
@@ -333,7 +334,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * }</pre>
 	 */
 	@Override
-	public <R> R collect(Supplier<R> supplier, BiConsumer<R, ? super T> accumulator, BiConsumer<R, R> combiner) {
+	public <R> R collect(final Supplier<R> supplier, final BiConsumer<R, ? super T> accumulator, final BiConsumer<R, R> combiner) {
 		return stream.collect(supplier, accumulator, combiner);
 	}
 
@@ -347,7 +348,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 收集后的容器
 	 */
 	@Override
-	public <R, A> R collect(Collector<? super T, A, R> collector) {
+	public <R, A> R collect(final Collector<? super T, A, R> collector) {
 		return stream.collect(collector);
 	}
 
@@ -358,7 +359,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 最小值
 	 */
 	@Override
-	public Optional<T> min(Comparator<? super T> comparator) {
+	public Optional<T> min(final Comparator<? super T> comparator) {
 		return stream.min(comparator);
 	}
 
@@ -369,7 +370,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 最大值
 	 */
 	@Override
-	public Optional<T> max(Comparator<? super T> comparator) {
+	public Optional<T> max(final Comparator<? super T> comparator) {
 		return stream.max(comparator);
 	}
 
@@ -390,7 +391,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 是否有任何一个元素满足给定断言
 	 */
 	@Override
-	public boolean anyMatch(Predicate<? super T> predicate) {
+	public boolean anyMatch(final Predicate<? super T> predicate) {
 		return stream.anyMatch(predicate);
 	}
 
@@ -401,7 +402,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 是否所有元素满足给定断言
 	 */
 	@Override
-	public boolean allMatch(Predicate<? super T> predicate) {
+	public boolean allMatch(final Predicate<? super T> predicate) {
 		return stream.allMatch(predicate);
 	}
 
@@ -412,7 +413,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 是否没有元素满足给定断言
 	 */
 	@Override
-	public boolean noneMatch(Predicate<? super T> predicate) {
+	public boolean noneMatch(final Predicate<? super T> predicate) {
 		return stream.noneMatch(predicate);
 	}
 
@@ -504,7 +505,7 @@ abstract class StreamWrapper<T, I extends Stream<T>> implements Stream<T>, Itera
 	 * @return 流
 	 */
 	@Override
-	public I onClose(Runnable closeHandler) {
+	public I onClose(final Runnable closeHandler) {
 		return convertToStreamImpl(stream.onClose(closeHandler));
 	}
 
diff --git a/hutool-core/src/test/java/cn/hutool/core/stream/CollectorUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/stream/CollectorUtilTest.java
index 00670f8d2..a56eefd30 100644
--- a/hutool-core/src/test/java/cn/hutool/core/stream/CollectorUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/stream/CollectorUtilTest.java
@@ -47,14 +47,14 @@ public class CollectorUtilTest {
 
 	@Test
 	public void testToEasyStream() {
-		Stream<Integer> stream =Stream.of(1, 2, 3, 4)
+		final Stream<Integer> stream =Stream.of(1, 2, 3, 4)
 			.collect(CollectorUtil.toEasyStream());
 		Assert.assertEquals(EasyStream.class, stream.getClass());
 	}
 
 	@Test
 	public void testToEntryStream() {
-		Map<String, Integer> map = Stream.of(1, 2, 3, 4, 5)
+		final Map<String, Integer> map = Stream.of(1, 2, 3, 4, 5)
 			// 转为EntryStream
 			.collect(CollectorUtil.toEntryStream(Function.identity(), String::valueOf))
 			// 过滤偶数
diff --git a/hutool-core/src/test/java/cn/hutool/core/stream/EasyStreamTest.java b/hutool-core/src/test/java/cn/hutool/core/stream/EasyStreamTest.java
index 6312d17e3..3e38345c1 100644
--- a/hutool-core/src/test/java/cn/hutool/core/stream/EasyStreamTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/stream/EasyStreamTest.java
@@ -209,7 +209,7 @@ public class EasyStreamTest {
 	}
 
 	@Test
-	public void testPeek(){
+	public void testPeek() {
 		EasyStream.of("one", "two", "three", "four")
 				.filter(e -> e.length() == 4)
 				.peek(e -> Assert.assertEquals("four", e))
@@ -219,12 +219,12 @@ public class EasyStreamTest {
 	}
 
 	@Test
-	public void testPeekIdx(){
+	public void testPeekIdx() {
 		EasyStream.of("one", "two", "three", "four")
 				.filter(e -> e.length() == 4)
-				.peekIdx((e,i) -> Assert.assertEquals("four:0", e + ":" + i))
+				.peekIdx((e, i) -> Assert.assertEquals("four:0", e + ":" + i))
 				.map(String::toUpperCase)
-				.peekIdx((e,i) -> Assert.assertEquals("FOUR:0", e + ":" + i))
+				.peekIdx((e, i) -> Assert.assertEquals("FOUR:0", e + ":" + i))
 				.collect(Collectors.toList());
 	}
 
@@ -455,7 +455,7 @@ public class EasyStreamTest {
 	@Test
 	public void testToTree() {
 		Consumer<Object> test = o -> {
-			List<Student> studentTree = EasyStream
+			final List<Student> studentTree = EasyStream
 					.of(
 							Student.builder().id(1L).name("dromara").build(),
 							Student.builder().id(2L).name("baomidou").build(),
@@ -488,7 +488,7 @@ public class EasyStreamTest {
 			), studentTree);
 		};
 		test = test.andThen(o -> {
-			List<Student> studentTree = EasyStream
+			final List<Student> studentTree = EasyStream
 					.of(
 							Student.builder().id(1L).name("dromara").matchParent(true).build(),
 							Student.builder().id(2L).name("baomidou").matchParent(true).build(),
@@ -525,7 +525,7 @@ public class EasyStreamTest {
 
 	@Test
 	public void testFlatTree() {
-		List<Student> studentTree = asList(
+		final List<Student> studentTree = asList(
 				Student.builder().id(1L).name("dromara")
 						.children(asList(Student.builder().id(3L).name("hutool").parentId(1L)
 										.children(singletonList(Student.builder().id(6L).name("looly").parentId(3L).build()))
@@ -575,9 +575,9 @@ public class EasyStreamTest {
 	@Test
 	public void testTransform() {
 		final boolean result = EasyStream.of(1, 2, 3)
-			.transform(EasyStream::toList)
-			.map(List::isEmpty)
-			.orElse(false);
+				.transform(EasyStream::toList)
+				.map(List::isEmpty)
+				.orElse(false);
 		Assert.assertFalse(result);
 	}