fix code

hutool-core/src/main/java/org/dromara/hutool/core/convert/impl/EnumConverter.java

@@ -44,7 +44,7 @@ public class EnumConverter extends AbstractConverter {
 	@Override
 	protected Object convertInternal(final Class<?> targetClass, final Object value) {
 		Enum enumValue = tryConvertEnum(value, targetClass);
-		if (null == enumValue && ! value instanceof String) {
+		if (null == enumValue && !(value instanceof String)) {
 			// 最后尝试先将value转String，再valueOf转换
 			enumValue = Enum.valueOf((Class) targetClass, convertToStr(value));
 		}

hutool-core/src/main/java/org/dromara/hutool/core/lang/mutable/MutableEntry.java

@@ -34,7 +34,7 @@ public class MutableEntry<K, V> extends AbsEntry<K, V> implements Mutable<Map.En
 	 * @param value 值
 	 * @param <K>   键类型
 	 * @param <V>   值类型
-	 * @return
+	 * @return {@code MutableEntry}
 	 */
 	public static <K, V> MutableEntry<K, V> of(final K key, final V value) {
 		return new MutableEntry<>(key, value);

hutool-core/src/main/java/org/dromara/hutool/core/reflect/ActualTypeMapperPool.java

@@ -116,7 +116,7 @@ public class ActualTypeMapperPool {
 			for (int i = 0; i < typeParameters.length; i++) {
 				value = typeArguments[i];
 				// 跳过泛型变量对应泛型变量的情况
-				if(! value instanceof TypeVariable){
+				if(!(value instanceof TypeVariable)){
 					typeMap.put(typeParameters[i], value);
 				}
 			}

hutool-http/src/main/java/org/dromara/hutool/http/client/engine/jdk/HttpUrlConnectionUtil.java

@@ -86,7 +86,7 @@ public class HttpUrlConnectionUtil {
 	 */
 	public static HttpURLConnection openHttp(final URL url, final Proxy proxy) throws IORuntimeException {
 		final URLConnection conn = openConnection(url, proxy);
-		if (! conn instanceof HttpURLConnection) {
+		if (!(conn instanceof HttpURLConnection)) {
 			// 防止其它协议造成的转换异常
 			throw new HttpException("'{}' of URL [{}] is not a http connection, make sure URL is format for http.",
 					conn.getClass().getName(), url);