String isNullOrEmpty in Java

Question

This surely has been asked before  but Googling doesn t find it  Is there  in any of the standard java libraries  including apache google       a static isNullOrEmpty   method for Strings

User · Answer

No  which is why so many other libraries have their own copy

User · Answer

For new projects  I ve started having every class I write extend the same base class where I can put all the utility methods that are annoyingly missing from Java like this one  the equivalent for collections  tired of writing list    null  amp  amp    list isEmpty     null-safe equals  etc   I still use Apache Commons for the implementation but this saves a small amount of typing and I haven t seen any negative effects

User · Answer

If you are doing android development  you can use   TextUtils isEmpty  CharSequence str     Added in API level 1 Returns true if the string is null or 0-length

User · Answer

I ve seen this method written a few times in projects I ve been on but I have to say I ve never written it myself  or called it either     Generally I find null and empty are completely distinct conditions and I have no reason to ever conflate them

User · Answer

To check if a string got any characters  ie  not null or whitespaces  check StringUtils hasText-method  if you are using Spring of course   Example   StringUtils hasText null     false StringUtils hasText        false StringUtils hasText         false StringUtils hasText  12345      true StringUtils hasText   12345       true

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In addition to the other answers  I ran across this because I m a C  programmer primarily  but trying to keep fresh in Java  I noticed that when I tried to use StringUtils my IDE  Eclipse  imported it from com mysql jdbc StringUtils which actually has an isNullOrEmpty myStringObject  method   ex   import com mysql jdbc StringUtils   StringUtils isNullOrEmpty host   Just another alternative for those who already have the MySQL connector referenced in your project  but not the other StringUtils library

User · Answer

You can add one  public static boolean isNullOrBlank String param         return param    null    param trim   length      0      I have  public static boolean isSet String param            doesn t ignore spaces  but does save an object creation      return param    null  amp  amp  param length      0

User · Answer

StringUtils isEmpty str  or StringUtils isNotEmpty str  StringUtils isBlank str  or StringUtils isNotBlank str    from Apache commons-lang   The difference between empty and blank is   a string consisted of whitespaces only is blank but isn t empty   I generally prefer using apache-commons if possible  instead of writing my own utility methods  although that is also plausible for simple ones like these

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com google common base Strings isNullOrEmpty String string  from Google Guava

User · Answer

public static boolean isNull String str            return str    null   true   false             public static boolean isNullOrBlank String param            if  isNull param     param trim   length      0                return true                    return false

[java] String isNullOrEmpty in Java?

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