JavaのCalendarクラス

import java.util.*;

class Sample{
    public static void main(String args[]) {
        int year;
        int month;
        int date;
        int hour;
        int minute;
        int second;
        int dayofweek;
        //曜日の配列を生成します
        String days[] = {"日曜日","月曜日","火曜日","水曜日","木曜日","金曜日","土曜日"};
        //Calendarオブジェクトを取得します
        Calendar now = Calendar.getInstance();
        
        //日付を出力します
        System.out.println( now.getTime());
        
        //年月日の変数に代入します
        year = now.get(now.YEAR);
        month = now.get(now.MONTH) + 1;
        date = now.get(now.DATE);
        
        //時刻の変数に代入します
        hour = now.get(now.HOUR);
        minute = now.get(now.MINUTE);
        second = now.get(now.SECOND);
        
        //曜日の変数に代入します
        dayofweek = now.get(now.DAY_OF_WEEK) - 1;
        
        //書式を付けて日付を出力します
        System.out.println(
            year + "年" +
            month + "月" +
            date + "日" +
            hour + "時" +
            minute + "分" +
            second + "秒" +
            days[dayofweek]	
        );
    }
}