/** * @author bzwm * */ import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Calendar; import java.util.GregorianCalendar;public class CalendarTest { public static void main(String[] args) throws IOException { BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); System.out.print("请输入一个年份："); String years = in.readLine(); CalendarPrinter cp = new CalendarPrinter(years); cp.printCal(); } }class CalendarPrinter { private int year; private static final int monthCount = 12; public CalendarPrinter(String years) { if (!years.matches("\\d{4}")) { System.out.println("year that inputted is illagel."); return; } year = Integer.parseInt(years); } public void printCal() { // construct d as current date GregorianCalendar gCal = new GregorianCalendar(); //set year gCal.set(Calendar.YEAR, year); for (int month = 0; month < monthCount; month++) { gCal.set(Calendar.MONTH, month); printOut(gCal); } } private void printOut(Calendar cal) { int month = cal.get(Calendar.MONTH); // set cal to start date of the month cal.set(Calendar.DAY_OF_MONTH, 1); int weekday = cal.get(Calendar.DAY_OF_WEEK); // print heading System.out.println("Sun Mon Tue Wed Thu Fri Sat"); // indent first line of calendar for (int i = Calendar.SUNDAY; i < weekday; i++) System.out.print(" "); do { // print day int day = cal.get(Calendar.DAY_OF_MONTH); if (day > 0) System.out.print(" " + day + " "); else System.out.print(" " + day + " "); // start a new line after every Saturday if (weekday == Calendar.SATURDAY) System.out.println(); // advance d to the next day cal.add(Calendar.DAY_OF_MONTH, 1); weekday = cal.get(Calendar.DAY_OF_WEEK); } while (cal.get(Calendar.MONTH) == month); // the loop exits when d is day 1 of the next month // print final end of line if necessary if (weekday != Calendar.SUNDAY) System.out.println(); } } 没有 实现 “统计并输出日期的个位数与相应的星期恰好相同的天数”。 printOut方法里面看看！楼主可以自行在我写的代码上加吧。
随手写了一个，比较简单，希望对你有启发。 import java.sql.Date; import java.text.SimpleDateFormat; import java.util.Calendar;import org.apache.commons.lang.time.DateUtils;public class Calendar2008 { public static void main(String[] args) { //2008年第一天 Date firstDay = Date.valueOf("2008-1-1"); //2009年第一天 Date lastDay = Date.valueOf("2009-1-1");
这是apache基金会的DateUtils工具类，非常实用，为什么不用呢？ 下面是源码：import java.text.ParseException; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.Iterator; import java.util.NoSuchElementException; import java.util.TimeZone;/** * <p>A suite of utilities surrounding the use of the * {@link java.util.Calendar} and {@link java.util.Date} object.</p> * * <p>DateUtils contains a lot of common methods considering manipulations * of Dates or Calendars. Some methods require some extra explanation. * The truncate and round methods could be considered the Math.floor(), * Math.ceil() or Math.round versions for dates * This way date-fields will be ignored in bottom-up order. * As a complement to these methods we've introduced some fragment-methods. * With these methods the Date-fields will be ignored in top-down order. * Since a date without a year is not a valid date, you have to decide in what * kind of date-field you want your result, for instance milliseconds or days. * </p> * * * * @author <a href="mailto:[email protected]">Serge Knystautas</a> * @author Stephen Colebourne * @author Janek Bogucki * @author <a href="mailto:[email protected]">Gary Gregory</a> * @author Phil Steitz * @author Robert Scholte * @since 2.0 * @version $Id: DateUtils.java 634096 2008-03-06 00:58:11Z niallp $ */ public class DateUtils {
/** * The UTC time zone (often referred to as GMT). */ public static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("GMT"); /** * Number of milliseconds in a standard second. * @since 2.1 */ public static final long MILLIS_PER_SECOND = 1000; /** * Number of milliseconds in a standard minute. * @since 2.1 */ public static final long MILLIS_PER_MINUTE = 60 * MILLIS_PER_SECOND; /** * Number of milliseconds in a standard hour. * @since 2.1 */ public static final long MILLIS_PER_HOUR = 60 * MILLIS_PER_MINUTE; /** * Number of milliseconds in a standard day. * @since 2.1 */ public static final long MILLIS_PER_DAY = 24 * MILLIS_PER_HOUR; /** * This is half a month, so this represents whether a date is in the top * or bottom half of the month. */ public final static int SEMI_MONTH = 1001; private static final int[][] fields = { {Calendar.MILLISECOND}, {Calendar.SECOND}, {Calendar.MINUTE}, {Calendar.HOUR_OF_DAY, Calendar.HOUR}, {Calendar.DATE, Calendar.DAY_OF_MONTH, Calendar.AM_PM /* Calendar.DAY_OF_YEAR, Calendar.DAY_OF_WEEK, Calendar.DAY_OF_WEEK_IN_MONTH */ }, {Calendar.MONTH, DateUtils.SEMI_MONTH}, {Calendar.YEAR}, {Calendar.ERA}}; /** * A week range, starting on Sunday. */ public final static int RANGE_WEEK_SUNDAY = 1; /** * A week range, starting on Monday. */ public final static int RANGE_WEEK_MONDAY = 2; /** * A week range, starting on the day focused. */ public final static int RANGE_WEEK_RELATIVE = 3; /** * A week range, centered around the day focused. */ public final static int RANGE_WEEK_CENTER = 4; /** * A month range, the week starting on Sunday. */ public final static int RANGE_MONTH_SUNDAY = 5; /** * A month range, the week starting on Monday. */ public final static int RANGE_MONTH_MONDAY = 6; /** * <p><code>DateUtils</code> instances should NOT be constructed in * standard programming. Instead, the class should be used as * <code>DateUtils.parse(str);</code>.</p> * * <p>This constructor is public to permit tools that require a JavaBean * instance to operate.</p> */ public DateUtils() { super(); } //----------------------------------------------------------------------- /** * Adds a number of days to a date returning a new object. * The original date object is unchanged. * * @param date the date, not null * @param amount the amount to add, may be negative * @return the new date object with the amount added * @throws IllegalArgumentException if the date is null */ public static Date addDays(Date date, int amount) { return add(date, Calendar.DAY_OF_MONTH, amount); } //----------------------------------------------------------------------- /** * Adds to a date returning a new object. * The original date object is unchanged. * * @param date the date, not null * @param calendarField the calendar field to add to * @param amount the amount to add, may be negative * @return the new date object with the amount added * @throws IllegalArgumentException if the date is null * @deprecated Will become privately scoped in 3.0 */ public static Date add(Date date, int calendarField, int amount) { if (date == null) { throw new IllegalArgumentException("The date must not be null"); } Calendar c = Calendar.getInstance(); c.setTime(date); c.add(calendarField, amount); return c.getTime(); }
//------------------------------------------------------------------------- // Deprecated int constants // TODO: Remove in 3.0
/** * Number of milliseconds in a standard second. * * @deprecated Use MILLIS_PER_SECOND. This will be removed in Commons Lang 3.0. */ public static final int MILLIS_IN_SECOND = 1000; /** * Number of milliseconds in a standard minute. * * @deprecated Use MILLIS_PER_MINUTE. This will be removed in Commons Lang 3.0. */ public static final int MILLIS_IN_MINUTE = 60 * 1000; /** * Number of milliseconds in a standard hour. * * @deprecated Use MILLIS_PER_HOUR. This will be removed in Commons Lang 3.0. */ public static final int MILLIS_IN_HOUR = 60 * 60 * 1000; /** * Number of milliseconds in a standard day. * * @deprecated Use MILLIS_PER_DAY. This will be removed in Commons Lang 3.0. */ public static final int MILLIS_IN_DAY = 24 * 60 * 60 * 1000;
}
import java.applet.Applet; import java.awt.*; import java.util.*; public class CalendarApplet extends Applet{ static final int TOP = 70; //顶端距离 static final int CELLWIDTH=50,CELLHEIGHT = 30; //单元格尺寸 static final int MARGIN = 3; //边界距离 static final int FEBRUARY = 1;
TextField tfYear = new TextField("2004", 5); //显示年份的文本域 Choice monthChoice = new Choice(); //月份选择下拉框 Button btUpdate = new Button("更新"); //更新按钮 GregorianCalendar calendar=new GregorianCalendar(); //日历对象 Font smallFont = new Font("TimesRoman", Font.PLAIN, 15); //显示小字体 Font bigFont = new Font("TimesRoman", Font.BOLD, 50); //显示大字体 String days[] = {"星期日", "星期一", "星期二", "星期三","星期四", "星期五", "星期六"}; String months[] = {"一月", "二月", "三月", "四月","五月", "六月", "七月", "八月", "九月","十月", "十一月", "十二月"}; int daysInMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; //每个月的天数 int searchMonth,searchYear; //查询的年份及月份 public void init(){ setBackground(Color.white); //设置背景颜色 searchMonth = calendar.get(Calendar.MONTH); //得到系统年份 searchYear = calendar.get(Calendar.YEAR); //得到系统月份 add(new Label(" 年:")); //增加组件到Applet tfYear.setText(String.valueOf(searchYear)); //设置文本域文字 add(tfYear); add(new Label(" 月:")); monthChoice.setFont(smallFont); //设置月份选择下拉框的显示字体 for (int i = 0; i < 12; i++) { monthChoice.addItem(months[i]); //增加下拉框选项 } monthChoice.select(searchMonth); //设置下拉框当前选择项 add(monthChoice); add(btUpdate); int componentCount=this.getComponentCount(); //得到Applet中的组件数量 for (int i=0;i<componentCount;i++){ getComponent(i).setFont(smallFont); //设置所有组件的显示字体 } }
public void paint(Graphics g){ FontMetrics fontMetric; //显示字体的FontMetrics对象 int fontAscent; int dayPos; int totalWidth, totalHeight; //总的宽度,高度 int numRows; //行数 int xNum, yNum; //水平和垂直方向单元格数量 int numDays; String dayStr; //显示天数字符串 int margin;
/**
* @author bzwm
*
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Calendar;
import java.util.GregorianCalendar;public class CalendarTest {
public static void main(String[] args) throws IOException {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("请输入一个年份：");
String years = in.readLine();
CalendarPrinter cp = new CalendarPrinter(years);
cp.printCal();
}
}class CalendarPrinter { private int year; private static final int monthCount = 12; public CalendarPrinter(String years) {
if (!years.matches("\\d{4}")) {
System.out.println("year that inputted is illagel.");
return;
}
year = Integer.parseInt(years);
} public void printCal() {
// construct d as current date
GregorianCalendar gCal = new GregorianCalendar(); //set year
gCal.set(Calendar.YEAR, year);
for (int month = 0; month < monthCount; month++) {
gCal.set(Calendar.MONTH, month);
printOut(gCal);
}
} private void printOut(Calendar cal) {
int month = cal.get(Calendar.MONTH); // set cal to start date of the month
cal.set(Calendar.DAY_OF_MONTH, 1); int weekday = cal.get(Calendar.DAY_OF_WEEK); // print heading
System.out.println("Sun Mon Tue Wed Thu Fri Sat"); // indent first line of calendar
for (int i = Calendar.SUNDAY; i < weekday; i++)
System.out.print(" "); do {
// print day
int day = cal.get(Calendar.DAY_OF_MONTH);
if (day > 0)
System.out.print(" " + day + " ");
else
System.out.print(" " + day + " "); // start a new line after every Saturday
if (weekday == Calendar.SATURDAY)
System.out.println(); // advance d to the next day
cal.add(Calendar.DAY_OF_MONTH, 1);
weekday = cal.get(Calendar.DAY_OF_WEEK);
} while (cal.get(Calendar.MONTH) == month);
// the loop exits when d is day 1 of the next month // print final end of line if necessary
if (weekday != Calendar.SUNDAY)
System.out.println();
}
}
没有 实现 “统计并输出日期的个位数与相应的星期恰好相同的天数”。
printOut方法里面看看！楼主可以自行在我写的代码上加吧。
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.Calendar;import org.apache.commons.lang.time.DateUtils;public class Calendar2008 { public static void main(String[] args) {
//2008年第一天
Date firstDay = Date.valueOf("2008-1-1");
//2009年第一天
Date lastDay = Date.valueOf("2009-1-1");
//日历对象
Calendar calendar = Calendar.getInstance();
//计数器
int count = 0;
//循环输出2008年日历
for(Date day = firstDay; day.before(lastDay);){
calendar.setTime(day);
String dayOfWeek = null;
switch(calendar.get(Calendar.DAY_OF_WEEK)){
case 1 : dayOfWeek = "星期天"; break;
case 2 : dayOfWeek = "星期一"; break;
case 3 : dayOfWeek = "星期二"; break;
case 4 : dayOfWeek = "星期三"; break;
case 5 : dayOfWeek = "星期四"; break;
case 6 : dayOfWeek = "星期五"; break;
case 7 : dayOfWeek = "星期六"; break;
default : break;
}
System.out.println(day + " : " + dayOfWeek);
/*
* 判断日期的个位数是否与相应的星期恰好相同
* calendar.get(Calendar.DATE) % 10 ： 得到日期的个位数
* calendar.get(Calendar.DAY_OF_WEEK) - 1 ： 对应的星期(在这里，按照国际惯例，将星期天记为第0天)
*/
if(calendar.get(Calendar.DATE) % 10 == calendar.get(Calendar.DAY_OF_WEEK) - 1){
count ++;
}
//完成循环变量day的自增操作
day = Date.valueOf(new SimpleDateFormat("yyyy-MM-dd").format(DateUtils.addDays(day, 1)));
}
System.out.println("日期的个位数与相应的星期恰好相同的天数为 : " + count);
}
}
其中，org.apache.commons.lang.time.DateUtils这个类，属于apache公司的commons.lang包，可以去http://www.findjar.com/index.jsp下载。
不晓得要求要GUI不
不晓得要求要GUI不
下面是源码：import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.TimeZone;/**
* <p>A suite of utilities surrounding the use of the
* {@link java.util.Calendar} and {@link java.util.Date} object.</p>
*
* <p>DateUtils contains a lot of common methods considering manipulations
* of Dates or Calendars. Some methods require some extra explanation.
* The truncate and round methods could be considered the Math.floor(),
* Math.ceil() or Math.round versions for dates
* This way date-fields will be ignored in bottom-up order.
* As a complement to these methods we've introduced some fragment-methods.
* With these methods the Date-fields will be ignored in top-down order.
* Since a date without a year is not a valid date, you have to decide in what
* kind of date-field you want your result, for instance milliseconds or days.
* </p>
*
*
*
* @author <a href="mailto:[email protected]">Serge Knystautas</a>
* @author Stephen Colebourne
* @author Janek Bogucki
* @author <a href="mailto:[email protected]">Gary Gregory</a>
* @author Phil Steitz
* @author Robert Scholte
* @since 2.0
* @version $Id: DateUtils.java 634096 2008-03-06 00:58:11Z niallp $
*/
public class DateUtils {
/**
* The UTC time zone (often referred to as GMT).
*/
public static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("GMT");
/**
* Number of milliseconds in a standard second.
* @since 2.1
*/
public static final long MILLIS_PER_SECOND = 1000;
/**
* Number of milliseconds in a standard minute.
* @since 2.1
*/
public static final long MILLIS_PER_MINUTE = 60 * MILLIS_PER_SECOND;
/**
* Number of milliseconds in a standard hour.
* @since 2.1
*/
public static final long MILLIS_PER_HOUR = 60 * MILLIS_PER_MINUTE;
/**
* Number of milliseconds in a standard day.
* @since 2.1
*/
public static final long MILLIS_PER_DAY = 24 * MILLIS_PER_HOUR; /**
* This is half a month, so this represents whether a date is in the top
* or bottom half of the month.
*/
public final static int SEMI_MONTH = 1001; private static final int[][] fields = {
{Calendar.MILLISECOND},
{Calendar.SECOND},
{Calendar.MINUTE},
{Calendar.HOUR_OF_DAY, Calendar.HOUR},
{Calendar.DATE, Calendar.DAY_OF_MONTH, Calendar.AM_PM
/* Calendar.DAY_OF_YEAR, Calendar.DAY_OF_WEEK, Calendar.DAY_OF_WEEK_IN_MONTH */
},
{Calendar.MONTH, DateUtils.SEMI_MONTH},
{Calendar.YEAR},
{Calendar.ERA}}; /**
* A week range, starting on Sunday.
*/
public final static int RANGE_WEEK_SUNDAY = 1; /**
* A week range, starting on Monday.
*/
public final static int RANGE_WEEK_MONDAY = 2; /**
* A week range, starting on the day focused.
*/
public final static int RANGE_WEEK_RELATIVE = 3; /**
* A week range, centered around the day focused.
*/
public final static int RANGE_WEEK_CENTER = 4; /**
* A month range, the week starting on Sunday.
*/
public final static int RANGE_MONTH_SUNDAY = 5; /**
* A month range, the week starting on Monday.
*/
public final static int RANGE_MONTH_MONDAY = 6; /**
* <p><code>DateUtils</code> instances should NOT be constructed in
* standard programming. Instead, the class should be used as
* <code>DateUtils.parse(str);</code>.</p>
*
* <p>This constructor is public to permit tools that require a JavaBean
* instance to operate.</p>
*/
public DateUtils() {
super();
} //-----------------------------------------------------------------------
/**
* Adds a number of days to a date returning a new object.
* The original date object is unchanged.
*
* @param date the date, not null
* @param amount the amount to add, may be negative
* @return the new date object with the amount added
* @throws IllegalArgumentException if the date is null
*/
public static Date addDays(Date date, int amount) {
return add(date, Calendar.DAY_OF_MONTH, amount);
} //-----------------------------------------------------------------------
/**
* Adds to a date returning a new object.
* The original date object is unchanged.
*
* @param date the date, not null
* @param calendarField the calendar field to add to
* @param amount the amount to add, may be negative
* @return the new date object with the amount added
* @throws IllegalArgumentException if the date is null
* @deprecated Will become privately scoped in 3.0
*/
public static Date add(Date date, int calendarField, int amount) {
if (date == null) {
throw new IllegalArgumentException("The date must not be null");
}
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(calendarField, amount);
return c.getTime();
}
//-------------------------------------------------------------------------
// Deprecated int constants
// TODO: Remove in 3.0
/**
* Number of milliseconds in a standard second.
*
* @deprecated Use MILLIS_PER_SECOND. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_SECOND = 1000;
/**
* Number of milliseconds in a standard minute.
*
* @deprecated Use MILLIS_PER_MINUTE. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_MINUTE = 60 * 1000;
/**
* Number of milliseconds in a standard hour.
*
* @deprecated Use MILLIS_PER_HOUR. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_HOUR = 60 * 60 * 1000;
/**
* Number of milliseconds in a standard day.
*
* @deprecated Use MILLIS_PER_DAY. This will be removed in Commons Lang 3.0.
*/
public static final int MILLIS_IN_DAY = 24 * 60 * 60 * 1000;
}
import java.applet.Applet;
import java.awt.*;
import java.util.*; public class CalendarApplet extends Applet{ static final int TOP = 70; //顶端距离
static final int CELLWIDTH=50,CELLHEIGHT = 30; //单元格尺寸
static final int MARGIN = 3; //边界距离
static final int FEBRUARY = 1;
TextField tfYear = new TextField("2004", 5); //显示年份的文本域
Choice monthChoice = new Choice(); //月份选择下拉框
Button btUpdate = new Button("更新"); //更新按钮
GregorianCalendar calendar=new GregorianCalendar(); //日历对象
Font smallFont = new Font("TimesRoman", Font.PLAIN, 15); //显示小字体
Font bigFont = new Font("TimesRoman", Font.BOLD, 50); //显示大字体
String days[] = {"星期日", "星期一", "星期二", "星期三","星期四", "星期五", "星期六"};
String months[] = {"一月", "二月", "三月", "四月","五月", "六月", "七月", "八月", "九月","十月", "十一月", "十二月"};
int daysInMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; //每个月的天数
int searchMonth,searchYear; //查询的年份及月份 public void init(){
setBackground(Color.white); //设置背景颜色
searchMonth = calendar.get(Calendar.MONTH); //得到系统年份
searchYear = calendar.get(Calendar.YEAR); //得到系统月份
add(new Label(" 年:")); //增加组件到Applet
tfYear.setText(String.valueOf(searchYear)); //设置文本域文字
add(tfYear);
add(new Label(" 月:"));
monthChoice.setFont(smallFont); //设置月份选择下拉框的显示字体
for (int i = 0; i < 12; i++) {
monthChoice.addItem(months[i]); //增加下拉框选项
}
monthChoice.select(searchMonth); //设置下拉框当前选择项
add(monthChoice);
add(btUpdate);
int componentCount=this.getComponentCount(); //得到Applet中的组件数量
for (int i=0;i<componentCount;i++){
getComponent(i).setFont(smallFont); //设置所有组件的显示字体
}
}
public void paint(Graphics g){
FontMetrics fontMetric; //显示字体的FontMetrics对象
int fontAscent;
int dayPos;
int totalWidth, totalHeight; //总的宽度,高度
int numRows; //行数
int xNum, yNum; //水平和垂直方向单元格数量
int numDays;
String dayStr; //显示天数字符串
int margin;
g.setColor(Color.lightGray); //设置当前颜色
g.setFont(bigFont); //设置当前使用字体
g.drawString(searchYear+"年",60,TOP+70); //绘制字符串
g.drawString((searchMonth+1)+"月",200,TOP+130);
g.setColor(Color.black);
g.setFont(smallFont);
fontMetric = g.getFontMetrics(); //获取变量初值
fontAscent = fontMetric.getAscent();
dayPos = TOP + fontAscent / 2;
totalWidth = 7 * CELLWIDTH; //得到总的表格宽度
for (int i = 0; i < 7; i++) {
g.drawString(days[i], (CELLWIDTH-fontMetric.stringWidth(days[i]))/2 + i*CELLWIDTH,dayPos-20); //绘制表格标题栏
}
numRows = getNumberRows(searchYear, searchMonth); //计算需要的行的数量
totalHeight = numRows * CELLHEIGHT; //得到总的表格高度
for (int i = 0; i <= totalWidth; i += CELLWIDTH) {
g.drawLine(i, TOP , i, TOP+ totalHeight); //绘制表格线
}
for (int i = 0, j = TOP ; i <= numRows; i++, j += CELLHEIGHT) {
g.drawLine(0, j, totalWidth, j); //绘制表格线
}
xNum = (getFirstDayOfMonth(searchYear, searchMonth) + 1) * CELLWIDTH - MARGIN;
yNum = TOP + MARGIN + fontAscent;
numDays = daysInMonth[searchMonth] + ((calendar.isLeapYear(searchYear) && (searchMonth == FEBRUARY)) ? 1 : 0);
for (int day = 1; day <= numDays; day++) {
dayStr = Integer.toString(day);
g.drawString(dayStr, xNum - fontMetric.stringWidth(dayStr), yNum); //绘制字符串
xNum += CELLWIDTH;
if (xNum > totalWidth) {
xNum = CELLWIDTH - MARGIN;
yNum += CELLHEIGHT;
}
}
}
public boolean action(Event e, Object o){
int searchYearInt;
if (e.target==btUpdate){
searchMonth = monthChoice.getSelectedIndex(); //得到查询月份
searchYearInt = Integer.parseInt(tfYear.getText(), 10); //得到查询年份
if (searchYearInt > 1581) {
searchYear = searchYearInt;
}
repaint(); //重绘屏幕
return true;
}
return false;
}
private int getNumberRows(int year, int month) { //得到行数量
int firstDay;
int numCells;
if (year < 1582) { //年份小于1582年，则返回-1
return (-1);
}
if ((month < 0) || (month > 11)) {
return (-1);
}
firstDay = getFirstDayOfMonth(year, month); //计算月份的第一天
if ((month == FEBRUARY) && (firstDay == 0) && !calendar.isLeapYear(year)) {
return 4;
}
numCells = firstDay + daysInMonth[month];
if ((month == FEBRUARY) && (calendar.isLeapYear(year))) {
numCells++;
}
return ((numCells <= 35) ? 5 : 6); //返回行数
}
private int getFirstDayOfMonth(int year, int month) { //得到每月的第一天
int firstDay;
int i;
if (year < 1582) { //年份小于1582年,返回-1
return (-1);
}
if ((month < 0) || (month > 11)) { //月份数错误,返回-1
return (-1);
}
firstDay = getFirstDayOfYear(year); //得到每年的第一天
for (i = 0; i < month; i++) {
firstDay += daysInMonth[i]; //计算每月的第一天
}
if ((month > FEBRUARY) && calendar.isLeapYear(year)) {
firstDay++;
}
return (firstDay % 7);
} private int getFirstDayOfYear(int year){ //计算每年的第一天
int leapYears;
int hundreds;
int fourHundreds;
int first;
if (year < 1582) { //如果年份小于1582年
return (-1); //返回-1
}
leapYears = (year - 1581) / 4;
hundreds = (year - 1501) / 100;
leapYears -= hundreds;
fourHundreds = (year - 1201) / 400;
leapYears += fourHundreds;
first=5 + (year - 1582) + leapYears % 7; //得到每年第一天
return first;
}
}