2.Date类
2.1Date常用方法:
2.2代码code:
package my_commoclass;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.SimpleTimeZone;
public class MyDate {
public static void main(String[] args) throws Exception {
Date date01 = new Date(120, 0, 30);
System.out.println(date01);
Date date02 = new Date(120, 1 ,30);
System.out.println(date02);
System.out.println("date01比date02早" + date01.before(date02));
System.out.println("date01比date02晚" + date01.after(date02));
System.out.println(date01.equals(date01));
System.out.println(date01.compareTo(date02));
Date today = new Date();
System.out.println(today);
System.out.println(today.getTime());
long longValue = today.getTime();
longValue +=1000;
today.setTime(longValue);
System.out.println(today.toString());
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(simpleDateFormat.format(today));
Calendar calendar = Calendar.getInstance();
System.out.println(calendar.get(Calendar.DAY_OF_MONTH));
System.out.println(calendar.get(Calendar.DAY_OF_WEEK));
Date day = new SimpleDateFormat("yyyy-MM-dd").parse("2021-05-01");
calendar.setTime(day);
System.out.println(calendar.get(Calendar.DAY_OF_WEEK));
}
}
2.3输出结果(截图):