随机抽取四张牌，并打印出来---Java

package practice.people.apple;
import java.util.Random;

public class DeckOfCards {
  public static void main(String[] args) {
    int deck[] = new int[52];
    String[] suits = {"黑桃","红桃","方块","梅花"};
    String[] ranks = {"A","2","3","4","5","6","7","8","9","J","Q","K"};
    //初始化每张牌
    for(int i = 0;i < deck.length; i++) {
      deck[i] = i;
    }
    //打乱牌次序
    for(int i = 0;i < deck.length; i++) {
      //随机产生一个元素下标0-51
      int index = (int)(Math.random()*deck.length);
      int temp = deck[i];
      deck[i] = deck[index];
      deck[index] = temp;
    }
    for(int i = 0;i < 4; i++) {
      String suit = suits[deck[i]/13];
      String rank = ranks[deck[i]%13];
      System.out.println(suit+"  "+rank);
    }
  }

}