业务代码写多了，应该时不时研究下算法，以保持思维的灵活性

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;/**打乱扑克牌*/
public class test1 {public static void main(String[] args) {String [] hua = new String[]{"黑桃","红桃","梅花","方砖"};String [] num = {"1","2","3","4","5","6","7","8","9","10","J","Q","K","A"};//抽象扑克牌集合List<String> puke = new LinkedList<>();for(int i=0;i<num.length;i++){
//          System.out.print("\n");for(int j=0;j<hua.length;j++){
//              System.out.print(hua[j]+num[i] +"\t");puke.add(hua[j]+num[i]);}}//实例化个随机数Random random = new Random();String temp = null;//模仿洗牌100次for(int k=0;k<100;k++){int max = puke.size();int be = random.nextInt(max)%(max-0+1);int af = random.nextInt(max)%(max-0+1);//两次抽取的随机数相等的话就不洗，以免会出现重复数值if(be==af)continue;
//          System.out.println(me);temp = puke.get(be);puke.set(be, puke.get(af));puke.set(af, temp);}int p = 0;for(Iterator<String> it = puke.iterator();it.hasNext();){if(p%4==0)System.out.print("\n");System.out.print(it.next());p++;}   }
}