# Frequent question: How to shuffle a deck of cards in java?

## How do you shuffle cards algorithm?

If you want to explain this to a non-programmer simply explain that the shuffle works by picking up a deck of cards, taking the first card and swapping it in the deck with a randomly chosen card and repeating this action on the second, third and subsequent cards until you reach the end of the deck.

## How big is 52 factorial?

52! is approximately 8.0658e67. For an exact representation, view a factorial table or try a “new-school” calculator, one that understands long integers.

## How many times should I shuffle?

Dr. Diaconis said he almost never sees a dealer shuffle seven times. He said his research also shows that when dealers shuffle several decks at once, they need to shuffle more. Two decks should be shuffled nine times, he said, and six decks should be shuffled 12 times, which is unheard of in the casinos.

## How do shuffle algorithms work?

Every time you pick a song, check if the song is one of the last x songs you played. If it is, pick a different song, repeat. Keep a second list of songs, and shuffle that list with for example the fisher yates algorithm. This prevents songs from repeating, but you have to maintain a second list of songs in memory.

## How does random shuffle work?

random provides shuffle() that shuffles the original list in place, and sample() that returns a new list that is randomly shuffled. sample() can also be used for strings and tuples. If you want to sort in ascending or descending order or reverse instead of shuffling, see the following articles.

## How do you shuffle an array?

1. Shuffle Array Elements using Collections Class. We can create a list from the array and then use the Collections class shuffle() method to shuffle its elements.
2. Shuffle Array using Random Class. We can iterate through the array elements in a for loop.

## Does riffle shuffle damage cards?

Magic cards are surprisingly resilient, and plenty of people riffle shuffle their decks and are 100% fine. If you bend them really aggressively, though, you’ll eventually get some wear along a line down the middle. Shuffling damage is generally in the form of worn edges or face scratches.