IsBlank and isEmply, stringutilsisblank of StringUtils

IsBlank and isEmply, stringutilsisblank of StringUtils

1. public static boolean isEmpty (String str)

Determines whether a string is null. If it is null, the standard is str = null or str. length () = 0.

StringUtils. isEmpty (null) = true
 
StringUtils. isEmpty ("") = true
 
StringUtils. isEmpty ("") = false // note that non-empty spaces are processed in StringUtils.

 

2. public static boolean isBlank (String str)
 
Determines whether a string is null or has a length of 0 or is composed of whitespace.

StringUtils. isBlank (null) = true

StringUtils. isBlank ("") = true

StringUtils. isBlank ("") = true

StringUtils. isBlank ("\ t \ n \ f \ r") = true // For tabs, line breaks, page breaks, and carriage returns

StringUtils. isBlank () // both are blank characters
 
StringUtils. isBlank ("\ B") = false // "\ B" is the word boundary.