酷!學園

int count=0;
for (int i=0;i<n;i++)
{
 if(i%2=0)
{
  count=count+i
}
}
sysout.print(“从0到N的偶数和为：=”+count);

我的电脑-环境变量的PATH修改一下。绝对是这里错了。

ResultSet  rs = st.executeQuery(sql);
 where(rs.next())
{
rs.getInt("userID");
rs.getString("userName");
}

不知道此位小哥问题解决否！提供代码

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class aaa {
   static List<String> parkList = new ArrayList<String>();
   static List<String> zslist = new ArrayList<String>();
   static List<String> lslist = new ArrayList<String>();
   static List<String> wwlist = new ArrayList<String>();
   static List<String> zllist = new ArrayList<String>();

   public static void main(String[] args) {
      // 初始化牌
      for (int i = 1; i < 5; i++) {
         switch (i) {
         case 1:
            initP("红桃");
            break;
         case 2:
            initP("梅花");
            break;
         case 3:
            initP("方片");
            break;
         case 4:
            initP("黑桃");
            break;
         }
      }
      // 开始分牌
      fenpai();
      for (int i = 0; i < 4; i++) {
         switch (i) {
         case 0:
            System.out.println("张三的牌为：=\r\n");
            printlist(zslist);
            break;
         case 1:
            System.out.println("李四的牌为：=\r\n");
            printlist(lslist);
            break;
         case 2:
            System.out.println("王五的牌为：=\r\n");
            printlist(wwlist);
            break;
         case 3:
            System.out.println("赵六的牌为：=\r\n");
            printlist(zllist);
            break;
         }
      }
   }

   private static void printlist(List<String> list) {
      for (int i = 0; i < list.size(); i++) {
         System.out.println(list.get(i));
      }
   }

   private static void initP(String str) {
      String temstr = str;
      for (int i = 1; i < 14; i++) {
         temstr = str;
         switch (i) {
         case 1:
            temstr = temstr + "A";
            break;
         case 11:
            temstr = temstr + "J";
            break;
         case 12:
            temstr = temstr + "Q";
            break;
         case 13:
            temstr = temstr + "K";
            break;
         default:
            temstr = temstr + i;
         }
         parkList.add(temstr);
      }
   }

   private static void fenpai() {
      Random random = new Random();
      int k = 0;
      for (int i = 0; i < parkList.size(); i++) {
         switch (k) {
         case 0:
            zslist.add(parkList.get(random.nextInt(parkList.size())));
            break;
         case 1:
            lslist.add(parkList.get(random.nextInt(parkList.size())));
            break;
         case 2:
            wwlist.add(parkList.get(random.nextInt(parkList.size())));
            break;
         case 3:
            zllist.add(parkList.get(random.nextInt(parkList.size())));
            break;
         }
         if (k == 3) {
            k = 0;
         }
         else
         {
            k++;
         }
      }
   }
}
自行修改！