第十三周上机作业

package finish;

import java.util.Random;

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

    }
}

2.package finish;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class finish {
    public static void main(String[] args) throws ParseException {
        // 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));
    }

}

3.package finish;

import java.util.Scanner;

public class finish {
    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");
        }

    }

}