十三周作业

package zuoye
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;
public class test {
 
    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 zuoye;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class test {
     public static void main(String[] args) {
         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 zuoye

import java.util.Scanner;

public class test {
    public static void main(String[] args) {        
        Scanner sc= new Scanner(System.in);
        System.out.println("输入一个邮箱地址");
        String string = sc.next();
        if(string.contains("@.") ==true) {
            int indexOf = string.indexOf("@.");
            String substring = string.substring(0, indexOf);
            System.out.println(substring);
        }else {
            System.out.println("邮箱不合法");
        }    
    }  
}