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题目:输出任意年份任意月份的日历表(公元后)
思路:
1.已知1年1月1日是星期日,1 % 7 = 1 对应的是星期日,2 % 7 = 2 对应的是星期一,以此类推;
2.计算当年以前所有天数+当年当月1号之前所有天数;
a.年份分平年闰年,平年365天,闰年366天;
b.闰年的判断方法year % 400 == 0 || (year % 100 != 0 year % 4 == 0)若为真,则为闰年否则为平年;
c.定义平年/闰年数组,包含各月天数;
d.遍历数组求和,计算当年当月前总天数;
e.当年以前所有天数+当年当月前总天数+1即为1年1月1日到当年当月1日的总天数;
3.总天数对7取模,根据结果判断当月1号是星期几,输出空白区域;
4.输出当月日历表,逢星期六换行
*/
import java.util.Scanner;
class FindMonthList {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.println("请输入年份:");
int year = sc.nextInt(); //年份
if (year 1) { //判断非法输入年份
System.out.println("输入错误!");
return;
}
System.out.println("请输入月份:");
int month = sc.nextInt(); //月份
if (month 1 || month 12) { //判断非法输入月份
System.out.println("输入错误!");
return;
}
//输出表头
System.out.println("-------" + year + " 年 " + month + " 月 " + "-------");
System.out.println();
System.out.println("日 一 二 三 四 五 六");
//计算当前年份以前所有天数beforeYearTotalDay;每4年一个闰年,闰年366天,平年365天
int beforeYearTotalDay = ((year - 1) / 4 * 366) + (year-1 - ((year - 1) / 4)) * 365;
int[] arrLeapYear = {0,31,29,31,30,31,30,31,31,30,31,30,31}; //闰年各月天数 int数组
int[] arrNormalYear = {0,31,28,31,30,31,30,31,31,30,31,30,31}; //平年各月天数 int数组
int beforeMonthTotalDay = 0; //定义本年当月之前月份的总天数
if (year % 400 == 0 || (year % 100 != 0 year % 4 == 0)) { //判断当前年份是否是闰年
for (int i = 0 ; i month ; i ++ ) { //for循环计算当月之前总天数
//计算当前月份之前的所有天数
beforeMonthTotalDay = beforeMonthTotalDay + arrLeapYear[i];
}
//判断当月1日是星期几
int totalDay = beforeYearTotalDay + beforeMonthTotalDay + 1;
int week = totalDay % 7;//已知1年1月1日是星期日,即模7得1对应的是星期日
for (int i = 0 ; i (week - 1 + 7) % 7 ; i ++) { //如果写成i (week-1)会出现i-1的情况
System.out.print(" ");//输出开头空白
}
for (int i = 1 ;i = arrLeapYear[month] ;i ++ ) { //for循环输出各月天数
System.out.print(i + " ");
if (i 10 ) { //小于10的数补一个空格,以便打印整齐
System.out.print(" ");
}
if (i % 7 == ((7-(week - 1)) % 7 ) || i == arrLeapYear[month]) {//每逢星期六/尾数换行
System.out.println();
}
}
} else { //不是闰年就是平年
for (int i = 0 ; i month ; i ++ ) { //for循环计算出当月之前月份总天数
beforeMonthTotalDay = beforeMonthTotalDay + arrNormalYear[i];
}
//判断当月1日是星期几
int totalDay = beforeYearTotalDay + beforeMonthTotalDay + 1;
int week = totalDay % 7;//已知1年1月1日是星期日,即模7得1对应的是星期日
for (int i = 0 ; i (week - 1 + 7) % 7 ; i ++) { //如果写成i (week-1)会出现i-1的情况
System.out.print(" ");//输出开头空白
}
for (int i = 1 ;i = arrNormalYear[month] ;i ++ ) {//for循环输出各月天数
System.out.print(i + " ");
if (i 10 ) { //小于10的数补一个空格,以便打印整齐
System.out.print(" ");
}
if (i % 7 == ((7-(week - 1)) % 7 ) || i == arrNormalYear[month]) {//每逢星期六/尾数换行
System.out.println();
}
}
}
}
}
显示效果:
按照你的要求编写的Java swing 带界面的万年历代码如下
//日历
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class CCI extends JFrame implements ActionListener{
JButton jb1=new JButton("");
JButton jb2=new JButton("");
JButton jb3=new JButton("");
JButton jb4=new JButton("");
JPanel jp1=new JPanel();
JPanel jp2=new JPanel();
JPanel jp3=new JPanel();
JPanel jp4=new JPanel();
JLabel jl1=new JLabel();
JLabel jl2=new JLabel();
JLabel[]jl=new JLabel[49];
String []week={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
Calendar c=Calendar.getInstance();
int year,month,day;
int nowyear,nowmonth,nowday;
CCI(){
super("简单日历");
nowyear=c.get(Calendar.YEAR);
nowmonth=c.get(Calendar.MONTH)+1;
nowday=c.get(Calendar.DAY_OF_MONTH);
year=nowyear;
month=nowmonth;
day=nowday;
String s=year+"年"+month+"月";
jl1.setForeground(Color.RED);
jl1.setFont(new Font(null,Font.BOLD,20));
jl1.setText(s);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
jb4.addActionListener(this);
jp1.add(jb1);jp1.add(jb2);jp1.add(jl1);jp1.add(jb3);jp1.add(jb4);
jp2.setLayout(null);
createMonthPanel();
jp2.add(jp3);
jl2.setFont(new Font(null,Font.BOLD,20));
jl2.setText("今天是"+nowyear+"年"+nowmonth+"月"+nowday+"日");
jp4.add(jl2);
add(jp1,BorderLayout.NORTH);
add(jp2,BorderLayout.CENTER);
add(jp4,BorderLayout.SOUTH);
setSize(500,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent ae) {
if(ae.getSource()==jb1){
year=year-1;
String s=year+"年"+month+"月";
jl1.setText(s);
jp3.removeAll();
createMonthPanel();
jp3.validate();
}
if(ae.getSource()==jb2){
if(month==1){
year=year-1;
month=12;
}else{
month=month-1;
}
String s=year+"年"+month+"月";
jl1.setText(s);
jp3.removeAll();
createMonthPanel();
jp3.validate();
}
if(ae.getSource()==jb3){
if(month==12){
year=year+1;
month=1;
}else{
month=month+1;
}
String s=year+"年"+month+"月";
jl1.setText(s);
jp3.removeAll();
createMonthPanel();
jp3.validate();
}
if(ae.getSource()==jb4){
year=year+1;
String s=year+"年"+month+"月";
jl1.setText(s);
jp3.removeAll();
createMonthPanel();
jp3.validate();
}
}
public static void main(String[] args) {
new CCI();
}
public int getMonthDays(int year, int month) {
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 2:
if ((year%4==0year%100!=0)||year%400==0) {
return 29;
} else {
return 28;
}
default:
return 30;
}
}
public void createMonthPanel(){
c.set(year, month-1, getMonthDays(year,month));
int weekOfMonth=c.get(Calendar.WEEK_OF_MONTH);
if(weekOfMonth==6){
jp3.setLayout(new GridLayout(7,7));
jp3.setBounds(50, 20, 420, 350);
}else{
jp3.setLayout(new GridLayout(6,7));
jp3.setBounds(50, 20, 420, 300);
}
jp3.setBorder(BorderFactory.createEtchedBorder());
for(int i=0;i7;i++){
jl[i]=new JLabel(week[i],JLabel.CENTER);
jl[i].setFont(new Font(null,Font.BOLD,20));
jl[i].setBorder(BorderFactory.createEtchedBorder());
jp3.add(jl[i]);
}
c.set(year, month-1, 1);
int emptyFirst=c.get(Calendar.DAY_OF_WEEK)-1;
int daysOfMonth=getMonthDays(year,month);
for(int i=6+emptyFirst;i=7;i--){
int intyear=year;
int intmonth=month;
if(intmonth==1){
intyear=intyear-1;
intmonth=12;
}else{
intmonth=intmonth-1;
}
int intdays=getMonthDays(intyear,intmonth);
jl[i]=new JLabel((intdays+7-i)+"",JLabel.CENTER);
jl[i].setFont(new Font(null,Font.BOLD,20));
jl[i].setForeground(Color.GRAY);
jl[i].setBorder(BorderFactory.createEtchedBorder());
jp3.add(jl[i]);
}
for(int i=7+emptyFirst;idaysOfMonth+7+emptyFirst;i++){
jl[i]=new JLabel((i-7-emptyFirst+1)+"",JLabel.CENTER);
jl[i].setFont(new Font(null,Font.BOLD,20));
if((i+1)%7==0 || (i+1)%7==1){
jl[i].setForeground(Color.RED);
}else if((i-7-emptyFirst+1)==nowdaymonth==nowmonthyear==nowyear)
jl[i].setForeground(Color.BLUE);
else
jl[i].setForeground(Color.BLACK);
jl[i].setBorder(BorderFactory.createEtchedBorder());
jp3.add(jl[i]);
}
if(weekOfMonth==6)
for(int i=48;i=daysOfMonth+emptyFirst+7;i--){
jl[i]=new JLabel((49-i)+"",JLabel.CENTER);
jl[i].setFont(new Font(null,Font.BOLD,20));
jl[i].setForeground(Color.GRAY);
jl[i].setBorder(BorderFactory.createEtchedBorder());
jp3.add(jl[i]);
}
else
for(int i=41;i=daysOfMonth+emptyFirst+7;i--){
jl[i]=new JLabel((42-i)+"",JLabel.CENTER);
jl[i].setFont(new Font(null,Font.BOLD,20));
jl[i].setForeground(Color.GRAY);
jl[i].setBorder(BorderFactory.createEtchedBorder());
jp3.add(jl[i]);
}
}
}
给你一个现成的，我自己写的。
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
public class WanNianLi extends JFrame implements ActionListener {
private static int year,month,days;
private JButton[] btn=new JButton[days];
WanNianLi() {
super("万年历");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridLayout bl=new GridLayout(5,7);
JPanel pane=new JPanel();
pane.setLayout(bl);
for (int i=0;idays;i++) {
int temp=i+1;
btn[i]=new JButton(""+temp);
btn[i].addActionListener(this);
pane.add(btn[i]);
}
setContentPane(pane);
pack();
setLookAndFeel();
setVisible(true);
}
public static void main(String[] args) {
if (args.length0)
year=Integer.parseInt(args[0]);
else
year=1982;
if (args.length1)
month=Integer.parseInt(args[1]);
else
month=1;
GetDays gd=new GetDays(year,month);
days=gd.getDays();
new WanNianLi();
}
public void actionPerformed(ActionEvent evt) {
Object src=evt.getSource();
for (int i=0;idays;i++)
if (src==btn[i]) {
int day=i+1;
GetWeekday gw=new GetWeekday(year,month,day);
String str="";
switch (gw.getWeekday()) {
case 1:
str="天";
break;
case 2:
str="一";
break;
case 3:
str="二";
break;
case 4:
str="三";
break;
case 5:
str="四";
break;
case 6:
str="五";
break;
case 7:
str="六";
break;
}
setTitle(year+"年"+month+"月"+day+"日"+"星期"+str);
repaint();
}
}
private void setLookAndFeel() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
}catch(Exception e){
System.out.print(e.toString());
}
}
}
//////////////
//获取星期几//
//////////////
class GetWeekday {
private Calendar cal=Calendar.getInstance();
private static int weekday;
public int getWeekday() {
return weekday;
}
GetWeekday(int y,int m,int d) {
cal.clear();
cal.set(Calendar.YEAR,y);
cal.set(Calendar.MONTH,m-1);
cal.set(Calendar.DAY_OF_MONTH,d);
weekday=cal.get(Calendar.DAY_OF_WEEK);
}
}
////////////////////
//获取当前月的天数//
////////////////////
class GetDays {
private static int days;
public int getDays() {
return days;
}
GetDays(int y,int m) {
GregorianCalendar gc=new GregorianCalendar();
switch (m) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days=31;
break;
case 4:
case 6:
case 9:
case 11:
days=30;
break;
case 2:
if (gc.isLeapYear(y))
days=29;
else
days=28;
break;
}
}
}
import java.io.*;
class putout{
public void putout(int f,int x,int y){
int i;
int a[]= new int[40];
System.out.println(" 日 一 二 三 四 五 六 "+" "+f+"月");
for (i=0;ix;i++)
{System.out.print(" "); }
for(i=x;ix+y;i++)
a[i]=i-x+1;
for(i=x;ix+y;i++)
{
if ((i%7==0)(i0))
System.out.print("\n");
if (a[i]10)
System.out.print(" "+a[i]);
else System.out.print(" "+a[i]);
}
System.out.println("\n");
}
}
class st{
public static void main(String args[])throws IOException{
putout p=new putout();
int year,mouth,y=1,t,i;
InputStreamReader ir;
BufferedReader in;
ir=new InputStreamReader(System.in);
in=new BufferedReader(ir);
System.out.print("请输入一个年份：");
String s=in.readLine();
year=Integer.parseInt(s);
if((year%4==0 year%100!=0)||(year%400==0))
mouth=1;
else
mouth=0;
y=year;
for(i=1;iyear;i++)
{if((i%4==0 i%100!=0)||(i%400==0))
y++;}
y=y%7;
for(i=1;i13;i++){
switch(i){
case 1: {p.putout(1,y,31);y=(y+31)%7;break;}
case 2: {p.putout(2,y,28+mouth);y=(y+28+mouth)%7;break;}
case 3: {p.putout(3,y,31);y=(y+31)%7;break;}
case 4: {p.putout(4,y,30);y=(y+30)%7;break;}
case 5: {p.putout(5,y,31);y=(y+31)%7;break;}
case 6: {p.putout(6,y,30);y=(y+30)%7;break;}
case 7: {p.putout(7,y,31);y=(y+31)%7;break;}
case 8: {p.putout(8,y,31);y=(y+31)%7;break;}
case 9: {p.putout(9,y,30);y=(y+30)%7;break;}
case 10: {p.putout(10,y,31);y=(y+31)%7;break;}
case 11: {p.putout(11,y,30);y=(y+30)%7;break;}
case 12: {p.putout(12,y,31);y=(y+31)%7;break;}
}
}
}
}