Java扑克牌洗牌代码

public class p18 {

public static void main(String[] args) {
//扑克牌洗牌 52张
//数组下标就是值
//0--12   13--25  26--38    39--51
//黑桃,       红心,      方块,      梅花

//每组13个元素， 元素 / 13 =花色
//元素 % 13 = 牌面数值

//生成一个0--51的随机数字 然后交换值就洗牌了

//牌的花色数组
String[] cardcolor = {"黑桃", "红心", "方块", "梅花"};
//牌面数值
String[] cardvalue = {"A","2","3","4","5","6","7","8","9","10","K","Q","J"};

final int n = 52;   //52张牌
int[] cards = new int
;

//把cards数组赋值 新牌
for (int i = 0; i < cards.length; i++) {
cards[i] = i;
}

//洗牌前的打印出来
System.out.println("洗牌前: ");
for (int i = 0; i < cards.length; i++) {

System.out.printf("[%d] %s-%s  ,",cards[i],cardcolor[i / 13],cardvalue[i%13]);
}
System.out.println("");
System.out.println("洗牌后: ");

//进行洗牌
//随机生成0--51之间的数字newIndex; cards[i]和cards[newIndes]交换
for (int i = 0; i < cards.length; i++) {
int newIndex = (int)(Math.random() * n); //生成随机数
int temp = cards[i];
cards[i] = cards[newIndex];  //交换牌的位置
cards[newIndex] = temp;
}

//洗牌后打印出来
for (int i = 0; i < cards.length; i++) {

System.out.printf("[%d] %s-%s  ,",cards[i],cardcolor[cards[i]/ 13],cardvalue[cards[i]%13]);
}
}

}