!964 NullComparator 比较器bug修复

Merge pull request !964 from 想长大的笨小孩/v5-master

hutool-core/src/main/java/cn/hutool/core/comparator/FuncComparator.java

@@ -53,7 +53,7 @@ public class FuncComparator<T> extends NullComparator<T> {
 	 */
 	@SuppressWarnings({"rawtypes", "unchecked"})
 	private int compare(T o1, T o2, Comparable v1, Comparable v2) {
-		int result = ObjectUtil.compare(v1, v2);
+		int result = ObjectUtil.compare(v1, v2, this.nullGreater);
 		if (0 == result) {
 			//避免TreeSet / TreeMap 过滤掉排序字段相同但是对象不相同的情况
 			result = CompareUtil.compare(o1, o2, this.nullGreater);

hutool-core/src/main/java/cn/hutool/core/comparator/NullComparator.java

@@ -51,11 +51,6 @@ public class NullComparator<T> implements Comparator<T>, Serializable {
 		return new NullComparator<>(nullGreater, comparator == null ? other : comparator.thenComparing(other));
 	}
 
-	@Override
-	public Comparator<T> reversed() {
-		return new NullComparator<>((false == nullGreater), comparator == null ? null : comparator.reversed());
-	}
-
 	/**
 	 * 不检查{@code null}的比较方法<br>
 	 * 用户可自行重写此方法自定义比较方式