fix bug

hutool-core/src/main/java/cn/hutool/core/collection/CollUtil.java

@@ -365,7 +365,11 @@ public class CollUtil {
 	 * @return 单差集
 	 */
 	public static <T> Collection<T> subtract(Collection<T> coll1, Collection<T> coll2) {
-		final Collection<T> result = ObjectUtil.clone(coll1);
+		Collection<T> result = ObjectUtil.clone(coll1);
+		if(null == result){
+			result = CollUtil.create(coll1.getClass());
+			result.addAll(coll1);
+		}
 		result.removeAll(coll2);
 		return result;
 	}
@@ -995,6 +999,11 @@ public class CollUtil {
 			try {
 				list = (Collection<T>) ReflectUtil.newInstance(collectionType);
 			} catch (Exception e) {
+				// 无法创建当前类型的对象，尝试创建父类型对象
+				final Class<?> superclass = collectionType.getSuperclass();
+				if(null != superclass && collectionType != superclass){
+					return create(superclass);
+				}
 				throw new UtilException(e);
 			}
 		}
@@ -1141,6 +1150,10 @@ public class CollUtil {
 		}
 
 		Collection<T> collection2 = ObjectUtil.clone(collection);
+		if(null == collection2){
+			// 不支持clone
+			collection2 = create(collection.getClass());
+		}
 		if (isEmpty(collection2)) {
 			return collection2;
 		}

hutool-core/src/main/java/cn/hutool/core/collection/ListUtil.java

@@ -332,7 +332,11 @@ public class ListUtil {
 	 * @since 4.0.6
 	 */
 	public static <T> List<T> reverseNew(List<T> list) {
-		final List<T> list2 = ObjectUtil.clone(list);
+		List<T> list2 = ObjectUtil.clone(list);
+		if(null == list2){
+			// 不支持clone
+			list2 = new ArrayList<>(list);
+		}
 		return reverse(list2);
 	}
 

hutool-core/src/main/java/cn/hutool/core/map/MapUtil.java

@@ -629,6 +629,10 @@ public class MapUtil {
 		}
 
 		Map<K, V> map2 = ObjectUtil.clone(map);
+		if(null == map2){
+			// 不支持clone
+			map2 = new HashMap<>(map.size(), 1f);
+		}
 		if (isEmpty(map2)) {
 			return map2;
 		}
@@ -636,7 +640,7 @@ public class MapUtil {
 			map2.clear();
 		} catch (UnsupportedOperationException e) {
 			// 克隆后的对象不支持清空，说明为不可变集合对象，使用默认的ArrayList保存结果
-			map2 = new HashMap<>();
+			map2 = new HashMap<>(map.size(), 1f);
 		}
 
 		Entry<K, V> modified;
@@ -687,6 +691,10 @@ public class MapUtil {
 			return map;
 		}
 		Map<K, V> map2 = ObjectUtil.clone(map);
+		if(null == map2){
+			// 不支持clone
+			map2 = new HashMap<>(map.size(), 1f);
+		}
 		if (isEmpty(map2)) {
 			return map2;
 		}

hutool-core/src/test/java/cn/hutool/core/collection/CollUtilTest.java

@@ -184,6 +184,28 @@ public class CollUtilTest {
 		Assert.assertEquals("x", subtract.iterator().next());
 	}
 
+	@Test
+	public void subtractSetTest() {
+		HashMap<String, Object> map1 = MapUtil.newHashMap();
+		HashMap<String, Object> map2 = MapUtil.newHashMap();
+		map1.put("1", "v1");
+		map1.put("2", "v2");
+		map2.put("2", "v2");
+		Collection<String> r2 = CollUtil.subtract(map1.keySet(), map2.keySet());
+		Assert.assertEquals("[1]", r2.toString());
+	}
+
+	@Test
+	public void subtractSetToListTest() {
+		HashMap<String, Object> map1 = MapUtil.newHashMap();
+		HashMap<String, Object> map2 = MapUtil.newHashMap();
+		map1.put("1", "v1");
+		map1.put("2", "v2");
+		map2.put("2", "v2");
+		List<String> r2 = CollUtil.subtractToList(map1.keySet(), map2.keySet());
+		Assert.assertEquals("[1]", r2.toString());
+	}
+
 	@Test
 	public void toMapListAndToListMapTest() {
 		HashMap<String, String> map1 = new HashMap<>();
@@ -709,7 +731,7 @@ public class CollUtilTest {
 	}
 
 	@Test
-	public void pageTest(){
+	public void pageTest() {
 		List<Dict> objects = CollUtil.newArrayList();
 		for (int i = 0; i < 10; i++) {
 			objects.add(Dict.create().set("name", "姓名：" + i));
@@ -719,7 +741,7 @@ public class CollUtilTest {
 	}
 
 	@Test
-	public void subtractToListTest(){
+	public void subtractToListTest() {
 		List<Long> list1 = Arrays.asList(1L, 2L, 3L);
 		List<Long> list2 = Arrays.asList(2L, 3L);