String is Empty Example

1. /*
           Java String isEmpty Example.
           This Java String isEmpty example shows how to check whether the given
           string is empty or not using isEmpty method of Java String class.
    */
   public class JavaStringIsEmptyExample {
           public static void main(String args[]){
   
   
                   String str1 = “”;
                   String str2 = null;
                   String str3 = “Hello World”;
   
   
                   /*
                    * To check whether the String is empty or not, use
                    * boolean isEmpty() method of Java String class.
                    *
                    * This method returns true if and only if string.length() is 0.
                    */
   
   
                   System.out.println(“Is String 1 empty? :” + str1.isEmpty());
   
   
                   //this will throw NullPointerException since str2 is null
                   //System.out.println(“Is String 2 empty? :” + str2.isEmpty());
                  
                   System.out.println(“Is String 3 empty? :” + str3.isEmpty());
   
   
                   /*
                    * Please note that isEmpty method was added in JDK 1.6 and it is not available
                    * in previous versions.
                    *
                    * However, you can use  
                    * (string.length() == 0) instead of (string.isEmpty())
                    * in previous JDK versions.
                    */
           }
   }
   
   
   /*
   Output of Java String isEmpty would be
   Is String 1 empty? :true
   Is String 3 empty? :false
   */