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Java ArrayList to Set

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]
*/

Sameera's blog

import java.util.List; import

Submitted by sreeram on Fri, 03/25/2011 - 16:45.

import java.util.List; import java.util.Vector; public class Main { public static void main(String[] args) { Vector v = new Vector(); v.add("1"); v.add("2"); v.add("3"); v.add("4"); v.add("5"); List lst = v.subList(1, 3); for (String str : v) { System.out.println(str); } Object obj = lst.remove(0); for (String str : v) { System.out.println(str); } } }