Android 取得年月日(當前時間)

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

public class Get_time {


    public  static String get_current_time(){

        Date currentTime = Calendar.getInstance().getTime();
        SimpleDateFormat df = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
         return df.format(currentTime);
    }
}