supress warning

hutool-setting/src/main/java/cn/hutool/setting/Setting.java

@@ -638,6 +638,7 @@ public class Setting extends AbsSetting implements Map<String, String> {
 	 *
 	 * @param m Map
 	 */
+	@SuppressWarnings("NullableProblems")
 	@Override
 	public void putAll(Map<? extends String, ? extends String> m) {
 		this.groupedMap.putAll(DEFAULT_GROUP, m);
@@ -656,6 +657,7 @@ public class Setting extends AbsSetting implements Map<String, String> {
 	 *
 	 * @return 默认分组（空分组）中的所有键列表
 	 */
+	@SuppressWarnings("NullableProblems")
 	@Override
 	public Set<String> keySet() {
 		return this.groupedMap.keySet(DEFAULT_GROUP);
@@ -666,6 +668,7 @@ public class Setting extends AbsSetting implements Map<String, String> {
 	 *
 	 * @return 默认分组（空分组）中的所有值列表
 	 */
+	@SuppressWarnings("NullableProblems")
 	@Override
 	public Collection<String> values() {
 		return this.groupedMap.values(DEFAULT_GROUP);
@@ -676,6 +679,7 @@ public class Setting extends AbsSetting implements Map<String, String> {
 	 *
 	 * @return 默认分组（空分组）中的所有键值对列表
 	 */
+	@SuppressWarnings("NullableProblems")
 	@Override
 	public Set<Entry<String, String>> entrySet() {
 		return this.groupedMap.entrySet(DEFAULT_GROUP);