StringUtils.defaultIfEmpty()方法



public static String defaultIfEmpty(String str,
                                    String defaultStr)

如果str为空，则返回defaultStr。否则返回str；

附官方解释：

defaultIfEmpty

public static String defaultIfEmpty(String str,                                      String defaultStr)

Returns either the passed in String, or if the String is empty or null, the value of defaultStr.

 StringUtils.defaultIfEmpty(null, "NULL")  = "NULL"   StringUtils.defaultIfEmpty("", "NULL")    = "NULL"   StringUtils.defaultIfEmpty("bat", "NULL") = "bat"   StringUtils.defaultIfEmpty("", null)      = null   

Parameters:

str- the String to check, may be null

defaultStr- the default String to return if the input is empty ("") or null, may be null

Returns:

the passed in String, or the default