十三周java作业

package fff;
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;
public class Zuoyee {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int arr[] = new int[11];
          Random r = new Random();
          for (int i = 0; i < 10; i++) 
          {
           System.out.println(r.nextInt(100) + 1);
          }
    }
}

package pp;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Zuoyee {
    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 pp;
import java.util.Scanner;
public class Zuoyee {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
          System.out.print("请输入合法的163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 j = 0; j < str.length() - 1; j++) {
           String str1 = str.substring(j, j + 1);
           if (str1.equals("@")) {
            count++;
            x = j;
           }
           if (str1.equals(".")) {
            count2++;
            y = j;
           }
           // 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");
          }
         }
        }