日期和日历类

package com.yh.day02.arrays;

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

/**
*
* @author sinosoft
*
*/
public class Test04 {

public static void main(String[] args) {
Date d=new Date();
System.out.println(d);
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String time=sdf.format(d);
System.out.println(time);
System.out.println("=========");

try {
SimpleDateFormat sdf1=new SimpleDateFormat("yyyy-MM-dd");
String s="2019-11-21";
Date date = sdf1.parse(s);
System.out.println(date.toLocaleString());

} catch (ParseException e) {
e.printStackTrace();
}
}
}

package com.yh.day02.arrays;

import java.util.Calendar;

/*
*
* 日历类
*/
public class Test05 {

public static void main(String[] args) {
Calendar c=Calendar.getInstance();
int year=c.get(Calendar.YEAR);
int month=c.get(Calendar.MONTH)+1;
int day=c.get(Calendar.DATE);
int week=c.get(Calendar.DAY_OF_WEEK);
System.out.println(year+"-"+month+"-"+day+" "+week);//1-7 是周六 1是周日

System.out.println(Math.random());//0-0.9999
}

}