[Java] 현재일 구하기

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

class test {

    public static void main(String args[]) {
       
        Calendar cal = new GregorianCalendar();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd") ;
               
        System.out.println(cal.toString());
        System.out.println(cal.get(Calendar.YEAR)+"년 "+cal.get (Calendar.MONTH)+"월 "+cal.get(Calendar.DAY_OF_MONTH)+"일");
       
        //1년전
        cal.add(Calendar.YEAR, -1);
        String date1 = sdf.format(cal.getTime());
        System.out.println(date1) ;
       
        //현재일
        String strDate = "";
        SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");        
        long currentTime = System.currentTimeMillis();
        strDate = df.format(new Date(currentTime));
        System.out.println(strDate);     

  

 //한줄 현재일

String strDate =new SimpleDateFormat("yyyyMMdd").format(new Date( System.currentTimeMillis() ));

       
        //시간
        String ap = "";
        if(1 == cal.get(Calendar.AM_PM)) {
            ap = "PM" ;
        }else {
            ap = "AM" ; 
        }
       
        System.out.println(ap + " " + cal.get(Calendar.HOUR) + ":" + cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND) + ":" + cal.get(Calendar.MILLISECOND));  
    }

}

-----------------------

SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
String now = df.format(new Date());
int strDate = Integer.parseInt(now.substring(0,4));

Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);