How do I use StringUtils in Java

Question

I m a beginner in Java  I want to use StringUtils replace but Eclipse outputs  StringUtils cannot be resolved    I tried import java lang     but it doesn t work

User · Answer

StringUtils is a utility class from Apache commons-lang  many libraries have it but this is the most common library   You need to download the jar and add it to your applications classpath

User · Answer

The mostly used StringUtils class is the Apache Commons Lang StringUtils  org apache commons lang3 StringUtils   To use this class you first have to download the Apache Commons Lang3 package then you have to add it to your project libraries   You can go to this link to get more details  http   examples javacodegeeks com core-java apache commons lang3 stringutils org-apache-commons-lang3-stringutils-example

User · Answer

java lang does not contain a class called StringUtils  Several third-party libs do  such as Apache Commons Lang or the Spring framework  Make sure you have the relevant jar in your project classpath and import the correct class

User · Answer

If you re developing for Android there is TextUtils class which may help you   import android text TextUtils    It is really helps a lot to check equality of Strings   For example if you need to check Strings s1  s2 equality  which may be nulls  you may use instead of  if   s1    null  amp  amp   s1 equals s2       s1    null  amp  amp  s2    null               this simple method    if   TextUtils equals s1  s2              As for initial question - for replacement it s easier to use s1 replace

User · Answer

StringUtils is an Apache Commons project  You need to download and add the library to your classpath   To use   import org apache commons lang3 StringUtils

User · Answer

StringUtils is in org apache commons lang   not in java lang    Most importantly learn to read javadoc file  All java programmers after learning basic java learn to read javadoc  execute tests from public projects  use those jars in their projects    If you are working on eclipse or netbeans you can make a directory  folder  called lib in your project  from within the IDE  and copy the downloaded jar from hard disk and paste it in that directory from eclipse or netbeans  Next you have to add it to your project   E g in case of eclipse from Project- Properties select  Java Build Path -  Add Jars  point to the jar you copied earlier  In your case it might be commons-lang-version jar    After this step whenever you add above import in a java file  those libraries will be available on your project  in case of eclipse or netbeans     From where do you get the jar for commons-lang  Root directory of any apache commons is http   commons apache org  And for commons-lang it is http   commons apache org lang   Some of these libraries contain User Guide and other help to get you started  but javadoc is the ultimate guide for any java programmer   It is right time you asked about this library  because you should never re-invent the wheel  Use apache commons and other well tested libraries whenever possible  By using those libraries you omit some common human errors and even test those libraries  using is testing   Sometimes in future when using this library  you may even write some modifications or addition to this library  If you contribute back  the world benefits    Most common use of StringUtils is in web projects  when you want to check for blank or null strings  checking if a string is number  splitting strings with some token   StringUtils helps to get rid of those nasty NumberFormat and Null exceptions  But StringUtils can be used anywhere String is used

User · Answer

StringUtils is part of Apache Commons Lang  http   commons apache org lang   and as the name suggest it provides some nice utilities for dealing with Strings  going beyond what is offered in java lang String  It consists of over 50 static methods   There are two different versions available  the newer org apache commons lang3 StringUtils and the older org apache commons lang StringUtils  There are not really any significant differences between the two  lang3 StringUtils requires Java 5 0 and is probably the version you ll want to use

[java] How do I use StringUtils in Java?

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