StringUtils isBlank vs String isEmpty

Question

I ran into some code that has the following    String foo   getvalue  foo    if  StringUtils isBlank foo       doStuff    else     doOtherStuff      This appears to be functionally equivalent to the following   String foo   getvalue  foo    if  foo isEmpty        doStuff    else     doOtherStuff      Is a difference between the two  org apache commons lang3 StringUtils isBlank and java lang String isEmpty

User · Answer

I am answering this because it s the top result in Google for  String isBlank   Method    If you are using Java 11 or above  you can use the String class isBlank   method  This method does the same thing as Apache Commons StringUtils class   I have written a small post on this method examples  read it here

User · Answer

StringUtils isBlank   will also check for null  whereas this   String foo   getvalue  foo    if  foo isEmpty      will throw a NullPointerException if foo is null

User · Answer

Instead of using third party lib  use Java 11 isBlank         String str1           String str2              Character ch     u0020       String str3  ch     ch       System out println str1 isEmpty       true     System out println str2 isEmpty       false     System out println str3 isEmpty       false                  System out println str1 isBlank       true     System out println str2 isBlank       true     System out println str3 isBlank       true

User · Answer

StringUtils isBlank   returns true for blanks just whitespaces and for null String as well  Actually it trims the Char sequences and then performs check   StringUtils isEmpty   returns true when there is no charsequence in the String parameter or when String parameter is null  Difference is that isEmpty   returns false if String parameter contains just whiltespaces  It considers whitespaces as a state of being non empty

User · Answer

StringUtils isBlank also returns true for just whitespace   isBlank String str  Checks if a String is whitespace  empty   quot  quot   or null

User · Answer

The only difference between isBlank   and isEmpty   is   StringUtils isBlank              true   compared string value has space and considered as blank  StringUtils isEmpty              false   compared string value has space and not considered as empty

User · Answer

The accepted answer from  arshajii is totally correct  However just being more explicit by saying below   StringUtils isBlank       StringUtils isBlank null         true  StringUtils isBlank              true    StringUtils isBlank              true    StringUtils isBlank  bob         false    StringUtils isBlank    bob       false   StringUtils isEmpty   StringUtils isEmpty null         true  StringUtils isEmpty              true    StringUtils isEmpty              false    StringUtils isEmpty  bob         false    StringUtils isEmpty    bob       false

User · Answer

StringUtils isBlank   checks that each character of the string is a whitespace character  or that the string is empty or that it s null   This is totally different than just checking if the string is empty  From the linked documentation   Checks if a String is whitespace  empty   quot  quot   or null   StringUtils isBlank null            true  StringUtils isBlank  quot  quot                true    StringUtils isBlank  quot   quot              true    StringUtils isBlank  quot bob quot           false    StringUtils isBlank  quot    bob    quot     false   For comparison StringUtils isEmpty   StringUtils isEmpty null         true  StringUtils isEmpty  quot  quot            true    StringUtils isEmpty  quot   quot           false    StringUtils isEmpty  quot bob quot         false    StringUtils isEmpty  quot   bob   quot     false  Warning  In java lang String isBlank   and java lang String isEmpty   work the same except they don t return true for null  java lang String isBlank    since Java 11  java lang String isEmpty

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StringUtils isBlank foo  will perform a null check for you  If you perform foo isEmpty   and foo is null  you will raise a NullPointerException

User · Answer

public static boolean isEmpty String ptext     return ptext    null    ptext trim   length      0     public static boolean isBlank String ptext     return ptext    null    ptext trim   length      0      Both have the same code how will isBlank handle white spaces probably you meant isBlankString this has the code for handling whitespaces   public static boolean isBlankString  String pString      int strLength   if  pString    null     strLength   pString length       0   return true   for int i 0  i  lt  strLength  i     if  Character isWhitespace pString charAt i     return false   return false

User · Answer

StringUtils isEmpty   String isEmpty checks   checks for null   StringUtils isBlank   StringUtils isEmpty checks   checks if the text contains only whitespace character s    Useful links for further investigation    StringUtils isBlank documentation StringUtils isEmpty documentation String isEmpty documentation

User · Answer

The bottom line is   isEmpty take  quot   quot  as a character but isBlank not  Rest both are same

[java] StringUtils.isBlank() vs String.isEmpty()

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