第十三周上机作业

package Wxte;
import java.util.Random;
public class Demmom {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
	     Random rand = new Random();
	     for (int i = 0; i < 10; i++) {
	            int a = rand.nextInt(100);
	            System.out.println(a);
	        }

	    }
	}

　　

package Wxte;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Best {
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 SimpleDateFormat CeshiFmt0 = new SimpleDateFormat("Gyyyy年MM月dd日");
	        SimpleDateFormat CeshiFmt5 = new SimpleDateFormat("今天是Gyyyy年的第 D 天 ，E");
	        Date now = new Date();
	        System.out.println(CeshiFmt0.format(now));
	        System.out.println(CeshiFmt5.format(now));
	    }
	}

　　

package Wxte;
import java.util.Scanner;
public class DAKE {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 Scanner input = new Scanner(System.in);
	     System.out.print("输入合法的邮箱：");
         String str = input.nextLine();
         int count = 0;// 定义一个计数器用来记录@的个数
         int count2 = 0;// 定义一个计数器用来记录.的个数
         int x = 0;// 用来记录出现第一个@对应的索引
         int y = 0;// 用来记录出现第一个.对应的索引

         for (int a = 0; a< str.length() - 1; a++) {
          String str1 = str.substring(a, a + 1);
          if (str1.equals("@")) {
           count++;
           x = a;
          }
          if (str1.equals(".")) {
           count2++;
           y = a;
          }

          // continue;

         }
         if (count == 1 && count2 == 1 && x < (y - 1) && x != 0 && y != str.length() - 1) {
          str.endsWith("@163.com");
          System.out.println("合法");
         } else {
          System.out.println("不合法");
         }

        }
}