我的作业v3.0

来源：互联网发布：河朔三镇知乎编辑：程序博客网时间：2024/05/21 21:45

//SeqShuffle.java
import java.util.Iterator;
import java.util.Random;

public class SeqShuffle implements Iterable{
   private int[] cards;
   SeqShuffle(int cnt){
       cards = new int[cnt];
       for(int i=0; i<cnt; i++){
           cards[i] = i;
           System.out.println(cards[i]);
       }

       Random rd = new Random(System.currentTimeMillis());

       for(int i=cnt-1; i>0; --i){
           int j = rd.nextInt(i);
           int temp =cards[i];
           cards[i] = cards[j];
           cards[j] = temp;
           System.out.print("第"+(cnt-i)+"次变换：");
           for(int k=0; k<cnt; k++){
               System.out.print(cards[k]);
           }
           System.out.println();
       }

   }
   public Iterator iterator(){
       return new ItrSeqShuffle(this.cards);
   }
}

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//ItrSeqShuffle.java
import java.util.Iterator;

public class ItrSeqShuffle implements Iterator {
   private int curpos;
   private int[] cards;
   public ItrSeqShuffle(int[] cards){
       curpos = -1;
       this.cards = cards;
   }

   @Override
   public boolean hasNext() {
       // TODO Auto-generated method stub
       return ++curpos < cards.length;
   }

   @Override
   public Object next() {
       // TODO Auto-generated method stub
       return cards[curpos];
   }

}

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//TestShuffle.java
import java.util.Iterator;

public class TestShuffle {
   public static void main(String[] args){
       SeqShuffle seqShuffle = new SeqShuffle(7);

       for(Object q:seqShuffle){
           System.out.print(q);
       }
       System.out.println();
   }
}

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