Random number class instances in Java Common class library

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/** Knowledge Points: Random number class practical application: Enemy aircraft randomly from the top of the screen appears */import java.util.*;p ublic class testrandomcard{public static void main    (string[] args)                      {string[] cards={"A", "a", "a", "a", "2", "2", "2", "2", "3", "3", "3", "3",                      "4", "4", "4", "4", "5", "5", "5", "5", "6", "6", "6", "6",                      "7", "7", "7", "7", "8", "8", "8", "8", "9", "9", "9", "9", "Ten", "Ten", "Ten", "Ten", "J", "J", "J", "J", "Q", "Q", "Q", "Q", "K"        , "K", "K", "K", "Xiao Wang", "King"};        System.out.println ("Original card:");        for (int i=0;i<cards.length;i++) {System.out.print (cards[i]+ ",");        }//Randomly scrambling Set set=new HashSet ();        Random rn=new random ();            while (true) {Set.add (Rn.nextint (54)); if (set.siZe () ==54) {break;        }} System.out.println ("\n54 Random index Number:");        Object[] Iter=set.toarray ();        for (int i=0;i<iter.length;i++) {System.out.print (iter[i]+ ",");        } List zhanshan=new ArrayList ();        List lisi=new ArrayList ();            List wangwu=new ArrayList (); }}

http://www.verejava.com/?id=169931132381103

Random number class instances in Java Common class library