Is Null or Empty 

Google Guava is a java library with lot of utilities and reusable components. This requires the library guava-10.0.jar to be in classpath. The following example shows using Strings.isNullOrEmpty() API. It returns TRUE if the given string is null or empty.

File Name  :   com/bethecoder/tutorials/guava/base_tests/StringNullEmptyTest.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.guava.base_tests; import com.google.common.base.Strings; public class StringNullEmptyTest {   /**    * @param args    */   public static void main(String[] args) {     System.out.println(Strings.isNullOrEmpty("BTC"));     System.out.println(Strings.isNullOrEmpty("           "));     System.out.println(Strings.isNullOrEmpty(""));     System.out.println(Strings.isNullOrEmpty(null));   } }

false
false

true
true