第十三周上机作业

1

package ssasdhier;

import java.util.Random;

public class suiji {
    public static void main(String[] args) {
        int[] a=new int[10];
        Random r=new Random();
        for(int i=0;i<a.length;i++){
            a[i]=r.nextInt(101);
        }
        for(int i=0;i<a.length;i++){
            System.out.println(a[i]);
        }
    }
}

　　2.

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

　　3.

public static void main(String[] args) {
        Scanner input= new Scanner(System.in);
        System.out.println("输入邮箱地址");
        String string = input.next();
        if(string.contains("@") ==true||string.contains(".") ==true) {
            int indexOf=string.indexOf("@");
            int indexOf2=string.indexOf(".");
           if (indexOf<indexOf2){
               String substring = string.substring(0, indexOf);
               System.out.println(substring);
           }else{
               System.out.println("邮箱不合法");
           }
        }else {
            System.out.println("邮箱不合法");
        }
    }