Method withNullComparator

src/main/java/com/ke/diff/Diff.java:194–197

自定义空类型比较器 @param nullComparator 空类型比较器 @return 对象本身

(NullComparator nullComparator)

     * @return 对象本身
     */
    public Diff withNullComparator(NullComparator nullComparator) {
        this.nullComparator = nullComparator;
        return this;
    }

    /**
     * 自定义其他类型比较器