Randomly taking a string and putting it into a Stack?

I currently have an ArrayList<String> with 52 elements. Each it a different card from a deck. I am trying to randomly pull a "card" from ArrayList and put it into a stack but am having some trouble. How would I use Random rand = new Random(); to pull a string indicating a card and store it in a stack?

List<Items> items = ...
Collections.shuffle(items);

Now just take the items off the list in order. They will be randomized from the shuffle.

You can also pass your own instance of Random as a second argument to shuffle. That is primarily useful when specifying a seed. Then it will always shuffle the same way. It's good for testing.

A different approach is to create a wrapper class for a List to return the values randomly. It makes a defensive copy of the list to avoid permuting the supplied list and guarantees that no value will be repeated. And like Collections.shuffle() you can supply an instance of Random as the second argument.

		List<Integer> list = List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
		RandomList<Integer> rlist = new RandomList<>(list);
		rlist.forEach(a->System.out.print(a + " "));

This instance printed

3 1 5 10 7 8 4 6 2 9 

class RandomList<T> implements Iterable<T> {
	private int count;
	private List<T> list;
	private Random r;
	
	public RandomList(List<T> list) {
		// make a defensive copy of passed list.
		this(list, new Random());
	}
	
	public RandomList(List<T> list, Random rand) {
	   this.list = new ArrayList<T>(list);
	   this.r = rand;
	   count = list.size();
	}
	private class MyIterator implements Iterator<T> {
		public boolean hasNext() {
			return count > 0;
		}
		
		public T next() {
			// get a random index
			int i = r.nextInt(count--);
			// and retrieve that value
			T v = list.get(i);
			// that value is now "used"
			// so replace it with the last
			// value in the list.
			list.set(i, list.get(count));
			return v;
		}
	}
	
	public Iterator<T> iterator() {
		return new MyIterator();
	}
}

</details>



# 答案2
**得分**: 0


@WJS提出了一个解决方案，但如果你想使用`Random`，那么你可以使用以下方法：

从ArrayList中获取一个随机字符串，找到一个随机索引，获取该元素并将其放入堆栈，然后从ArrayList中删除该元素。

```java
Random rand = new Random(); 
int index=rand.nextInt(list.size());
String card=list.get(index);
stack.push(card);
list.remove(index);

Random rand = new Random(); 
int index=rand.nextInt(list.size());
String card=list.get(index);
stack.push(card);
list.remove(index);

答案3

得分: 0

如果您使用 rand.nextInt(52)；
它会随机生成一个介于 0 和 51 之间的值（两者都包括在内）。

您如何从您的数据中获取第1张、第n张或第52张卡？