打乱java中的对象数组无法正常工作

Question

我创建了一组要洗牌的卡片对象。但是，当我使用简单的 shuffle 方法时，输出不正确。它不是洗牌，而是复制一些卡片并删除其他卡片。这是打印内容的示例

Jack of Clubs

5 of Hearts

4 of Hearts

7 of Hearts

5 of Hearts

Ace of Spades

8 of Clubs

5 of Hearts

Jack of Diamonds

Jack of Clubs

Queen of Diamonds

Jack of Diamonds

9 of Diamonds

4 of Hearts

Jack of Diamonds

3 of Diamonds

6 of Diamonds

Jack of Clubs

4 of Hearts

10 of Diamonds

Jack of Diamonds

2 of Diamonds

Queen of Diamonds

7 of Hearts

5 of Hearts

King of Diamonds

5 of Hearts

9 of Diamonds

Ace of Spades

4 of Diamonds

King of Diamonds

10 of Hearts

9 of Diamonds

2 of Diamonds

10 of Diamonds

5 of Hearts

10 of Diamonds

Queen of Diamonds

Queen of Diamonds

Queen of Diamonds

4 of Diamonds

2 of Diamonds

9 of Diamonds

Queen of Diamonds

10 of Diamonds

7 of Hearts

5 of Hearts

8 of Clubs

4 of Hearts

5 of Hearts

5 of Hearts

5 of Hearts

如您所见，钻石太多，而几乎没有梅花或黑桃。我也注意到只有西装是乱七八糟的。每个数字都有四个，四个千斤顶皇后，国王和 A。谢谢您的帮助。