初學java 發牌問題??

Question

import java.util.*;
public class b_1
{
        public  static  void  main(String[] args)
        {
                
int i,j,k;
                int[] card=new int[52];        //用來記錄該位牌是否已被發出
                int[][] a=new int[4][13];      //記錄發到的牌
                int num=13;                    //設定發 13 張牌
                int s,t;
                String[] cname={"梅花","方塊","紅心","黑桃"};
                Random randomG=new Random();
//---------------起始值設定-------------------------------------------
                for (i=0;i<=51;i=i+1)
                        card[0]=0;         //初始設定=0
                for (i=0;i<4;i=i+1)
                        for (j=0;j<13;j=j+1)
                           a[i][j]=0;      //二維a陣列=0//-------------由電腦亂數產生------------------------------------------
                for (i=0;i<4;i=i+1)
                        for (j=0;j<num;j=j+1)
                        {
                                k=randomG.nextInt(52);
                                while (card[k]!=0) k=randomG.nextInt(52);
                                a[i][j]=k; //二維a陣列=k
                                card[k]=1;
                        }
//-----------顯示到瑩幕-------------------------------------------------
                for (i=0;i<4;i=i+1)
                  {
                        for (j=0;j<num;j=j+1)
                        {
                                s=a[i][j]/13;
                                t=(a[i][j]%13)+1;//取餘數
                  
     if (t==1)              //這裡的判斷一直有錯46-55行  
                                return (cname[s]+"A");
                        else if (t==13)
                                return (cname[s]+"K");
                        else if (t==12)
                                return (cname[s]+"Q");
                        else if (t==11)
                                return (cname[s]+"J");
                             else
                                return (cname[s]+t);
                       
    
                        System.out.print(cname[s]+t+" ");
                         }
                        System.out.println();
                   }
                       
        }
}上面的程序一直有傳回值的錯誤
請各位高手幫我想想到底哪裡錯了  要怎麼解決