我做了個輸入日期，然后計算距離1月1號過了多少天的JAVA代碼，求會JAVA的網友幫我看看哪里錯了

第一，你沒有考慮平年閏年的問題，閏年二月有29天

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第二，你的break放在return之后，java編譯器會報錯，看你寫代碼這么繞，java基礎應該不差啊，那么問你，return之后的語句有意義嗎？

第三，打印流在整個類中的使用中如果關閉一次，下次就無法打開，所以最后再關閉打印流，在輸入月份的時候不要關閉打印流，就你的input.close()去掉，完了就對了

java 如何判斷 一年的最后一周是否跨年

給定一個時間范圍判斷周的范圍并且跨年為新的一周即跨年時分為兩周

public class Week{

public static void main(String[] args) {

SimpleDateFormat myFormatterExt = new SimpleDateFormat("yyyy-MM-dd");

Date b_date = null;

Date e_date = null;

try {

b_date = myFormatterExt.parse("2010-12-26");//開始時間

e_date = myFormatterExt.parse("2011-01-06");//結束時間

//e_date = myFormatterExt.parse("2011-01-08");

// date= myFormatterExt.parse("2010-12-31 00:00:00");

// String week = HNFDCommon.getWeek(date);

//System.out.println(week+"week");

} catch (ParseException e) {

e.printStackTrace();

}

b_date = getFirstDayOfWeek(b_date);

e_date = getLastDayOfWeek(e_date);

int dayOfweek = 0; //日期為星期幾判斷12月最后一個星期用

while (b_date.getTime() == e_date.getTime() || b_date.before(e_date))

{

String week = HNFDCommon.getWeek(b_date);

System.out.println(week+"ddd"+myFormatterExt.format(b_date));

String days = myFormatterExt.format(b_date).substring(8,10);

if(dayOfweek0){

b_date.setDate(b_date.getDate() +(7-dayOfweek));

dayOfweek = 0;

}else{

if(Integer.parseInt(week.substring(5,7))=50 (31- Integer.parseInt(days))7){

Date c_date = new Date();

c_date.setYear(b_date.getYear());

c_date.setMonth(b_date.getMonth());

c_date.setDate(31);

dayOfweek = getDayOfWeek(c_date);

b_date.setDate(b_date.getDate() +dayOfweek-1);

if(week.equals(HNFDCommon.getWeek(b_date))){

b_date.setDate(b_date.getDate() +(7-dayOfweek));

dayOfweek = 0;

}

}

else{

b_date.setDate(b_date.getDate() +7);

}

}

}

}

public static Date getLastDayOfWeek(Date date) {

SimpleDateFormat sd = new SimpleDateFormat("yyyy");

Calendar c = new GregorianCalendar();

c.setFirstDayOfWeek(Calendar.SUNDAY);

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()+6); // Sunday

if(!sd.format(date).equals(sd.format(c.getTime()))){

c.setTime(date);

}

return c.getTime();

}

public static Date getFirstDayOfWeek(Date date) {

SimpleDateFormat sd = new SimpleDateFormat("yyyy");

Calendar c = new GregorianCalendar();

c.setFirstDayOfWeek(Calendar.SUNDAY);

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Sunday

if(!sd.format(date).equals(sd.format(c.getTime()))){

c.setTime(date);

}

return c.getTime();

}

public static int getDayOfWeek(Date date) {

Calendar c = new GregorianCalendar();

c.setFirstDayOfWeek(Calendar.SUNDAY);

c.setTime(date);

//c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday

return c.get(Calendar.DAY_OF_WEEK);

}

}

HNFDCommon 類中：

public static String getWeek(Date date)

{

String rtn="";

int year;

int week;

SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");

Calendar cd = Calendar.getInstance();

cd.setTime(date);

year=cd.get(Calendar.YEAR);

week = cd.get(Calendar.WEEK_OF_YEAR);

//System.out.println("ttt"+sd.format(cd.getTime())+"bbb"+week);

int vmonth = cd.get(Calendar.MONTH)+1;

if(week == 1 vmonth == 12){

cd.add(Calendar.WEEK_OF_YEAR,-1);

week =cd.get(Calendar.WEEK_OF_YEAR)+1;

}

if(week 6 vmonth == 1){

year--;

}

if(week 10){

rtn=year+"00"+week;

}

else{

rtn=year+"0"+week;

}

return rtn;

}

java給定兩個日期,求兩個日期之間的日期段,以月為分隔~!

用java的日歷類

public static void main(String[] args) throws ParseException {

String d1= "2011-05-12";

String d2="2011-08-15";

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");

Date date1 = format.parse(d1);

Date date2 = format.parse(d2);

Calendar cal =Calendar.getInstance();

cal.setTime(date1);

int day = cal.get(Calendar.DAY_OF_MONTH);

while(cal.getTime().before(date2)){

String begin = format.format(cal.getTime());

int max = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

cal.set(Calendar.DAY_OF_MONTH, max);

String end = cal.getTime().before(date2) ? format.format(cal.getTime()) : d2;

System.out.println(begin+"~"+end);

cal.add(Calendar.MONTH, 1);

cal.set(Calendar.DAY_OF_MONTH, day);

}

}

做個日期查詢，判斷開始日期與終止日期范圍必須在一個月之內，用java代碼

import java.text.DateFormat;

import java.text.ParsePosition;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.logging.SimpleFormatter;

public class DateTest {

/**

* 判斷是否在同一個月

* @param startDate yyyy-MM-dd

* @param endDate yyyy-MM-dd

* @return false:不在同一個月內，true在同一個月內

*/

public static boolean isMonth(String startDate,String endDate){

if(margin(startDate, endDate)31){

return false;

}

int startMonth = Integer.parseInt(startDate.substring(5, 7));

int endMonth = Integer.parseInt(endDate.substring(5, 7));

if(startMonth==endMonth){

return true;

}else{

return false;

}

}

/**

* 計算開始日期和結束日期差

* @param startDate yyyy-MM-dd

* @param endDate yyyy-MM-dd

* @return

*/

private static int margin(String startDate,String endDate){

ParsePosition pos = new ParsePosition(0);

ParsePosition pos2 = new ParsePosition(0);

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Date ds = sdf.parse(startDate, pos);

Date de = sdf.parse(endDate, pos2);

long l = de.getTime()-ds.getTime();

int margin = (int)(l/24*60*60*1000);

return margin;

}

/**

* main方法測試

* @param args

*/

public static void main(String[] args) {

System.out.println(DateTest.isMonth("2014-10-17", "2014-10-25"));

System.out.println(DateTest.isMonth("2014-10-17", "2014-12-25"));

}

}

java怎樣判斷兩個日期之間相差幾周(支持跨年)?

/**

?*?獲取兩個日期相差的天數

?*?@param?big

?*?@param?small

?*?@return

?*/

public?static?int?getTwoDatesDifOfDay(Date?big,Date?small){

Calendar?cal1?=?Calendar.getInstance();

cal1.setTime(big);

Calendar?cal2?=?Calendar.getInstance();

cal2.setTime(small);

if(cal1.get(Calendar.MONTH)?!=?11??cal2.get(Calendar.MONTH)==11){//跨年

Calendar?cal3?=?Calendar.getInstance();

cal3.set(Calendar.MONTH,?11);

cal3.set(Calendar.DAY_OF_MONTH,?31);

return?cal3.get(Calendar.DAY_OF_YEAR)-cal2.get(Calendar.DAY_OF_YEAR)+cal1.get(Calendar.DAY_OF_YEAR);

}else{

return? cal1.get(Calendar.DAY_OF_YEAR)-cal2.get(Calendar.DAY_OF_YEAR);

}

}

/**

?*?獲取兩個日期相差的周數

?*?@param?big

?*?@param?small

?*?@return

?*/

public?static?int?getTwoDatesDifOfWeek(Date?big,Date?small){

Calendar?cal1?=?Calendar.getInstance();

cal1.setTime(big);

Calendar?cal2?=?Calendar.getInstance();

cal2.setTime(small);

if(cal1.get(Calendar.MONTH)?!=?11??cal2.get(Calendar.MONTH)==11){//跨年

Calendar?cal3?=?Calendar.getInstance();

cal3.set(Calendar.MONTH,?11);

cal3.set(Calendar.DAY_OF_MONTH,?31);

return?cal3.get(Calendar.WEEK_OF_YEAR)-cal2.get(Calendar.WEEK_OF_YEAR)+cal1.get(Calendar.WEEK_OF_YEAR);

}else{

return? cal1.get(Calendar.WEEK_OF_YEAR)-cal2.get(Calendar.WEEK_OF_YEAR);

}

}

網頁標題：java做個跨年代碼 程序員的跨年代碼
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