![R和Rstudio终端显示语言的更改[Windows]](/aiimages/R%E5%92%8CRstudio%E7%BB%88%E7%AB%AF%E6%98%BE%E7%A4%BA%E8%AF%AD%E8%A8%80%E7%9A%84%E6%9B%B4%E6%94%B9%5BWindows%5D.png)
public class NewClass{
public static void main(String[] args){
int year,month
Calender cal=new Calender(2008,10)
cal.showCalender()
year=Integer.parseInt(JOptionPane.showInputDialog("Year:"))
month=Integer.parseInt(JOptionPane.showInputDialog("Month:"))
cal.setYear(year)
cal.setMonth(month)
cal.showCalender()
}
}
class Calender{
private int year,month
public Calender(){
year=0
month=1
}
public Calender(int year){
this.year=year
month=1
}
public Calender(int year,int month){
this.year=year
if(month>12)
this.month=month%12
else
this.month=month
}
public void setYear(int year){
this.year=year
}
public void setMonth(int month){
if(month>12)
this.month=month%12
else
this.month=month
}
private int dayOfMonth(){
int days=0
switch(month){
case 1:days=31break
case 2:{
if(((year%4==0)&&(year%100!=0))||(year%400==0))
days=29
else
days=28
break
}
case 3:days=31break
case 4:days=30break
case 5:days=31break
case 6:days=30break
case 7:days=31break
case 8:days=31break
case 9:days=30break
case 10:days=31break
case 11:days=30break
case 12:days=31break
default:
days=0
}
return days
}
private int dayOfWeek(){
int Y=year
int M=month
int D=1
int A
A = Y>0?(5+(Y+1)+(Y-1)/4-(Y-1)/100+(Y-1)/400)%7:(5+Y+Y/4-Y/100+Y/400)%7
A = M>2?(A+2*(M+1)+3*(M+1)/5)%7:(A+2*(M+2)+3*(M+2)/5)%7
if (((Y%4 == 0 &&Y%100 != 0)|| Y%400 == 0) &&M>2) A =(A+1)%7
A=(A+D)%7
return A
}
public void showCalender(){
String str=new String()
str=" "
str+=year+"年"+month+"月"
str+="\n\n"
str+="日 一 二 三 四 五 六\n"
int week=this.dayOfWeek()
for(int i=0,j=1i<7i++){
if(i<week)
str+=" "
else{
str+=" "+j+""
j++
}
}
str+="\n"
end:
for(int i=7-week+1i<=this.dayOfMonth()){
for(int j=0j<7j++){
if(i<10)
str+=" "+i+""
else
str+=i+" "
i++
if(i>this.dayOfMonth())
break end
}
str+="\n"
}
JOptionPane.showMessageDialog(null,str)
}
}
用一个类来实现
按照你的要求编写的Java日历验证程序如下
UI.java
import java.util.Scannerpublic class UI {
static Scanner sc=new Scanner(System.in)
public static int askInt(String s){
System.out.print(s)
return sc.nextInt()
}
public static void println(String s){
System.out.println(s)
}
}
EE.java
public class EE {public void validateDateCore(){
int year =UI.askInt("Enter the year: ")
int month=UI.askInt("Enter the month: ")
int day=UI.askInt("Enter the day: ")
if(year < 1){
UI.println("The year is not a valid number.")
return
}
if(month<1 || month>12){
UI.println("The month is not a valid number.")
return
}
int monthDay=0
switch(month){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:monthDay=31break
case 4:
case 6:
case 9:
case 11:monthDay=30break
case 2:
if((year%4==0 && year%100!=0) || year%400==0){
monthDay=29
}else{
monthDay=28
}
break
}
if(day<1 || day>monthDay){
UI.println("The day is not a valid number.")
return
}else{
UI.println("It is "+day+"/"+month+"/"+year+".")
}
}
public static void main(String[] args) {
new EE().validateDateCore()
}
}
运行结果
看看下面代码：import java.awt.*
import java.awt.event.*
import java.util.Calendar
import javax.swing.JOptionPane
class CalendarBean
{
String day[]
int year=2011,month=0
public void setYear(int year)
{this.year=year
}
public int getYear()
{return year
}
public void setMonth(int month)
{this.month=month
}
public int getMonth()
{return month
}
public String[] getCalendar()
{ String a[]=new String[42]
Calendar 日历=Calendar.getInstance()
日历.set(year,month-1,1)
int 星期几=日历.get(Calendar.DAY_OF_WEEK)-1
int day=0
if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
{ day=31
}
if(month==4||month==6||month==9||month==11)
{ day=30
}
if(month==2)
{ if(((year%4==0)&&(year%100!=0))||(year%400==0))
{ day=29
}
else
{ day=28
}
}
for(int i=星期几,n=1i<星期几+dayi++)
{
a[i]=String.valueOf(n)
n++
}
return a
}
}
class CalendarFrame extends Frame implements ActionListener
{
Label labelDay[]=new Label[42]
Button titleName[]=new Button[7]
String name[]={"日","一","二","三", "四","五","六"}
TextField text1,text2Button nextMonth,previousMonth,EnterLabel lab1,lab2,lab3
int year=2012,month=5
CalendarBean calendar
Label showMessage=new Label("",Label.CENTER)
public CalendarFrame()
{ Panel pCenter=new Panel()
pCenter.setLayout(new GridLayout(7,7))
for(int i=0i<7i++)
{ titleName[i]=new Button(name[i])
pCenter.add(titleName[i])
}
for(int i=0i<42i++)
{
labelDay[i]=new Label("",Label.CENTER)
pCenter.add(labelDay[i])
}
calendar=new CalendarBean()
calendar.setYear(year)
calendar.setMonth(month)
String day[]=calendar.getCalendar()
for(int i=0i<42i++)
{ labelDay[i].setText(day[i])
}
lab1=new Label("请输入日期")
lab2=new Label("年份")
lab3=new Label("月份")
Enter=new Button("确定")
text1=new TextField(10)
text2=new TextField(5)
nextMonth=new Button("下月")
previousMonth=new Button("上月")
Enter.addActionListener(this)
nextMonth.addActionListener(this)
previousMonth.addActionListener(this)
Panel pNorth=new Panel(),
pSouth=new Panel()
pNorth.add( lab1)
pNorth.add(lab2)
pNorth.add( text1)
pNorth.add(lab3)
pNorth.add(text2)
pNorth.add(Enter)
pNorth.add(previousMonth)
pNorth.add(nextMonth)
pSouth.add(showMessage)
showMessage.setText("日历："+calendar.getYear()+"年"+ calendar.getMonth()+"月" )
ScrollPane scrollPane=new ScrollPane()
scrollPane.add(pCenter)
add(scrollPane,BorderLayout.CENTER)
add(pNorth ,BorderLayout.NORTH)
add(pSouth ,BorderLayout.SOUTH)
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==nextMonth)
{ month=month+1
if(month>12)
month=1
calendar.setMonth(month)
String day[]=calendar.getCalendar()
for(int i=0i<42i++)
{ labelDay[i].setText(day[i])
}
}
else if(e.getSource()==previousMonth)
{ month=month-1
if(month<1)
month=12
calendar.setMonth(month)
String day[]=calendar.getCalendar()
for(int i=0i<42i++)
{ labelDay[i].setText(day[i])
}
}else {
String yea=text1.getText()
String mon=text2.getText()
try{
year=Integer.parseInt(yea)
month=Integer.parseInt(mon)
if(month>12||month<1||year<1){
JOptionPane.showMessageDialog(null, "请输入正确月份或月份")
return
}
else{
calendar.setYear(year)
calendar.setMonth(month)
}
String day[]=calendar.getCalendar()
for(int i=0i<42i++)
{
labelDay[i].setText(day[i])
}
}catch(NumberFormatException ee){
JOptionPane.showMessageDialog(null, "请输入正确的年份及月份")
}
}
showMessage.setText("日历："+calendar.getYear()+"年"+calendar.getMonth()+"月" )
}
}
public class CalendarMainClass
{ public static void main(String args[])
{ CalendarFrame frame=new CalendarFrame()
frame.setTitle("日历")
frame.setBounds(300,200,500,300)
frame.setVisible(true)
frame.validate()
frame.addWindowListener(new java.awt.event.WindowAdapter()
{ public void windowClosing(java.awt.event.WindowEvent e)
{ System.exit(0)
}
}
)
}
}
有问题就追问。满意请采纳。
