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Java ArrayList to Set

warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 340.
warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Asia/Calcutta' for 'IST/5.0/no DST' instead in /home/javadeve/public_html/sites/all/modules/advanced_blog/advanced_blog.module on line 341.

Submitted by Sameera on Fri, 11/12/2010 - 19:51

import java.util.ArrayList;
import java.util.HashSet;
 
//Java ArrayList to Set
 
/*
 * This Java ArrayList to Set example shows how to convert Java ArrayList to set
 * like HashSet.
 */
 
public class JavaArrayListToSet {
    public static void main(String args[]){
       
        ArrayList<String> alistNumbers = new ArrayList<String>();
        alistNumbers.add("1");
        alistNumbers.add("2");
        alistNumbers.add("3");
        alistNumbers.add("1");
 
        /*
         * To convert Java ArrayList to Set, use
         * HashSet(Collection list)
         * constructor of HashSet class.
         */
       
        HashSet<String> hashSetNumbers = new HashSet<String>(alistNumbers);
       
        //print values of Set created from ArrayList
        System.out.println(hashSetNumbers);
       
        /*
         * Set implementation does not allow duplicate elements. As you can see
         * from the output after creating HashSet from ArrayList, duplicate
         * element 1 was also removed from the HashSet.
         */
    }
}
 
/*
Output of above given Java ArrayList to Set would be
[1, 2, 3]
*/