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+"");
}
}
