Question

java编写程序计算本年度任意一天是星期几

用Switch语句编写

Answer 1

public static void main(String[] args) {

//Calendar.getInstance()表示今天，换其他日期则today.set(2009, 3, 1);
//注意set(2009, 3, 1)中的3其实是4月，月数从0-11
Calendar today = Calendar.getInstance();
//星期数，从星期天开始到星期六为0-7
System.out.println(today.get(Calendar.DAY_OF_WEEK));
}

Answer 2

package dates;

import java.text.DateFormat;
import java.util.*;

public class JspCalendar {
Calendar calendar = null;

public JspCalendar() {
calendar = Calendar.getInstance();
Date trialTime = new Date();
calendar.setTime(trialTime);
}

public int getYear() {
return calendar.get(Calendar.YEAR);
}

public String getMonth() {
int m = getMonthInt();
String[] months = new String [] { "1", "2", "3",
"4", "5", "6",
"7", "8", "9",
"10", "11", "12" };
if (m > 12)
return "Unknown to Man";

return months[m - 1];

}

public String getDay() {
int x = getDayOfWeek();
String[] days = new String[] {"1", "2", "3",
"4", "5", "6","7"};

if (x > 7)
return "Unknown to Man";

return days[x - 1];

}

public int getMonthInt() {
return 1 + calendar.get(Calendar.MONTH);
}

public String getDate() {
return getMonthInt() + "/" + getDayOfMonth() + "/" + getYear();

}

public String getTime() {
return getHour() + ":" + getMinute() + ":" + getSecond();
}

public int getDayOfMonth() {
return calendar.get(Calendar.DAY_OF_MONTH);
}

public int getDayOfYear() {
return calendar.get(Calendar.DAY_OF_YEAR);
}

public int getWeekOfYear() {
return calendar.get(Calendar.WEEK_OF_YEAR);
}

public int getWeekOfMonth() {
return calendar.get(Calendar.WEEK_OF_MONTH);
}

public int getDayOfWeek() {
return calendar.get(Calendar.DAY_OF_WEEK);
}

public int getHour() {
return calendar.get(Calendar.HOUR_OF_DAY);
}

public int getMinute() {
return calendar.get(Calendar.MINUTE);
}

public int getSecond() {
return calendar.get(Calendar.SECOND);
}

public static void main(String args[]) {
JspCalendar db = new JspCalendar();
p("date: " + db.getDayOfMonth());
p("year: " + db.getYear());
p("month: " + db.getMonth());
p("time: " + db.getTime());
p("date: " + db.getDate());
p("Day: " + db.getDay());
p("DayOfYear: " + db.getDayOfYear());
p("WeekOfYear: " + db.getWeekOfYear());
p("era: " + db.getEra());
p("ampm: " + db.getAMPM());
p("DST: " + db.getDSTOffset());
p("ZONE Offset: " + db.getZoneOffset());
p("TIMEZONE: " + db.getUSTimeZone());
}

private static void p(String x) {
System.out.println(x);
}

public int getEra() {
return calendar.get(Calendar.ERA);
}

public String getUSTimeZone() {
String[] zones = new String[] {"Hawaii", "Alaskan", "Pacific",
"Mountain", "Central", "Eastern"};

return zones[10 - getZoneOffset()];
}

public int getZoneOffset() {
return calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000);
}

public int getDSTOffset() {
return calendar.get(Calendar.DST_OFFSET)/(60*60*1000);
}

public int getAMPM() {
return calendar.get(Calendar.AM_PM);
}
}

Answer 3

你们真一个一个在这上面敲吗？少说也要二十分钟吧！