import java.util.Collections; import java.util.Vector; public class Main { public static void main(String[] args) { Vector<String> v = new Vector<String>(); v.add("1"); v.add("2"); v.add("3"); v.add("4"); v.add("5"); System.out.println(v); Collections.shuffle(v); System.out.println(v); } } /*[1, 2, 3, 4, 5] [5, 4, 1, 3, 2] */