StringUtils下几种判空方法

秒速五厘米 2022-06-09 06:39 183阅读 0赞

![Center][]1.public static boolean isEmpty(final CharSequence cs) \{  
        return cs == null || cs.length() == 0;

判断的主要根据字符串长度和NULL.![Center 1][]

2.  public static boolean isNotEmpty(final CharSequence cs) \{  
        return !isEmpty(cs);  
    \}

直接上例子

![Center 2][]

3.    public static boolean isAnyEmpty(final CharSequence... css) \{  
      if (ArrayUtils.isEmpty(css)) \{  
        return false;  
      \}  
      for (final CharSequence cs : css)\{  
        if (isEmpty(cs)) \{  
          return true;  
        \}  
      \}  
      return false;  
    \}

两种情况:①数组②字符串

规律:如果数组的长度是0,直接返回false,

符合字符串的isEmpty()返回true,其余均为false![Center 3][]

public static boolean isNoneEmpty(final CharSequence... css) \{  
      return !isAnyEmpty(css);  
    \}

取反:

![Center 4][]

5.    public static boolean isAllEmpty(final CharSequence... css) \{  
        if (ArrayUtils.isEmpty(css)) \{  
            return true;  
        \}  
        for (final CharSequence cs : css) \{  
            if (isNotEmpty(cs)) \{  
                return false;  
            \}  
        \}  
        return true;  
    \}

![Center][]

[Center]: /images/20220609/6184451884b942c589b8ed17b545bb94.png
[Center 1]: /images/20220609/8ebc9bb2da06488e80c80b535fb5b780.png
[Center 2]: /images/20220609/e48222adac9c454ea35d4d6cf274e489.png
[Center 3]: /images/20220609/c5bd62f269bb41b8bea09f683e56f054.png
[Center 4]: /images/20220609/3e78c9e0297f4f2b9e10cef0113c9683.png