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 Tools and Libs > Commons Lang3 > Strings > Default String

Default String 

Apache Commons Lang 3.0 is a java library with lot of utilities and reusable components. This requires the library commons-lang3-3.0.1.jar to be in classpath. The following example shows using StringUtils.defaultString() API. It returns an empty string if the given string is null, otherwise returns the same string back.

File Name  :  
com/bethecoder/tutorials/commons_lang/tests/strings/DefaultStringTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.commons_lang.tests.strings;

import org.apache.commons.lang3.StringUtils;

public class DefaultStringTest {

  /**
   @param args
   */
  public static void main(String[] args) {
         
    //StringUtils.defaultString(String str)
    System.out.println(StringUtils.defaultString(null));   //empty
    System.out.println(StringUtils.defaultString(""));     //empty
    System.out.println(StringUtils.defaultString("java"))//java

    //StringUtils.defaultString(String str, String defaultStr)
    System.out.println(StringUtils.defaultString(null, "N/A"));  //N/A
    System.out.println(StringUtils.defaultString("""N/A"));    //empty
    System.out.println(StringUtils.defaultString("java""N/A"));//java
  }

}
   

It gives the following output,


java
N/A

java


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