Friday 13 April 2018

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
    */

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