第12次作业

一 ：

package cn.edu.ccut.jsts;
import java.util.*;
public class Test {

    public static void main(String[] args) {
        Scanner in =new Scanner(System.in);
        System.out.println("输入年月日：");
        int year=in.nextInt();
        int month=in.nextInt();
        int day=in.nextInt();
        Calendar calendar = Calendar.getInstance();
        long today = calendar.getTimeInMillis();//1970.1.1距离今天时间
        System.out.println("现在距离1970.1.1过了:"+today+"毫秒");
        calendar.set(year,month-1,day);//自定义设置日历字段
        long brday = calendar.getTimeInMillis();//出生那天距离1970.1.1过去了多长时间
        System.out.println("出生那天距离1970.1.1过了:"+brday+"毫秒");
        int cssj = (int) ((today-brday)/(3600000*24));
        System.out.println("距离出生那天已经过去了:"+cssj+"天");
    }

}

二 ：

package cn.edu.ccut.jsts;

public class Suijs {

    public static void main(String[] args) {
        int a = 1+(int)( Math.random()*100);
        if(a==1)a-=1;
        System.out.println("随机0~100以内："+a+"");
        int b = 1+(int)( Math.random()*100);
        if(b>70)b-=30;
        if(b<30)b+=30;
        System.out.println("随机30~70以内："+b+"");

    }

}