用java图形用户界面实现: 编写一个日历程序，能实现显示日历等简单功能。 (运行后有窗体出现的那 用java图形用户界面实现: 编写一个日历程序，能实现显示日历等简单功能。

package mycalendar;

import java.util.*;

class ViewMonth {

int month;

int year;

ViewMonth(final int displayMonth, final int displayYear) {

month = displayMonth;

year = displayYear;

}

private String checkMonth() {

String[] months = {

"1 月" , "2 月" , "3 月",

"4 月" , "5 月" , "6 月",

"7 月" , "8 月" , "9 月",

"10 月" , "11 月" , "12 月"

};

return months[month];

}

private int checkDays() {

int[] numofDays = {

31, 28, 31,

30, 31, 30,

31, 31, 30,

31, 30, 31

};

return numofDays[month];

}

/**

* 使用此方法打印该月的日历.

*/

void printMonth() {

/* 将该月份起始处的天数留空. */

int initialSpaces = 0;

try {

/* 获取月份名称. */

String monthName = checkMonth();

System.out.println();

System.out.println("\t\t\t " + year + " 年 " + monthName );

System.out.println();

} catch (ArrayIndexOutOfBoundsException ae) {

System.out.println("超出范围 ..........");

System.exit(0);

}

GregorianCalendar cal = new GregorianCalendar(year, month, 1);

System.out.println("\t日\t一\t二\t三\t四\t五\t六");

initialSpaces = cal.get(Calendar.DAY_OF_WEEK) - 1;

/* 获取天数. */

int daysInMonth = checkDays();

/* 检查是否为闰年并为二月增加一天. */

if (cal.isLeapYear(cal.get(Calendar.YEAR)) && month == 1) {

++daysInMonth;

}

for (int ctr = 0; ctr < initialSpaces; ctr++) {

System.out.print("\t");

}

for (int ctr = 1; ctr <= daysInMonth; ctr++) {

/* 为单个日期添加空格. */

if (ctr <= 9) {

System.out.print(" ");

}

System.out.print("\t" + ctr);

/* 检查行的末尾. */

if ((initialSpaces + ctr) % 7 == 0) {

System.out.println();

} else {

System.out.print(" ");

}

}

System.out.println();

}

}

class J7上机2 {

protected J7上机2() {

}

public static void main(String[] args) {

int month, year;

if (args.length == 2) {

System.out.println("显示日历");

System.out.println();

int mon = Integer.parseInt(args[0]);

month = mon - 1;

year = Integer.parseInt(args[1]);

} else {

Calendar today = Calendar.getInstance();

month = today.get(Calendar.MONTH);

year = today.get(Calendar.YEAR);

}

ViewMonth mv = new ViewMonth(month, year);

mv.printMonth();

}

}

给你

import javax.swing.JOptionPane;

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=31;break;

case 2:{

if(((year%4==0)&&(year%100!=0))||(year%400==0))

days=29;

else

days=28;

break;

}

case 3:days=31;break;

case 4:days=30;break;

case 5:days=31;break;

case 6:days=30;break;

case 7:days=31;break;

case 8:days=31;break;

case 9:days=30;break;

case 10:days=31;break;

case 11:days=30;break;

case 12:days=31;break;

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=1;i<7;i++){

if(i

str+=" ";

else{

str+=" "+j+" ";

j++;

}

}

str+="\n";

end:

for(int i=7-week+1;i<=this.dayOfMonth();){

for(int j=0;j<7;j++){

if(i<10)

str+=" "+i+" ";

else

str+=i+" ";

i++;

if(i>this.dayOfMonth())

break end;

}

str+="\n";

}

JOptionPane.showMessageDialog(null,str);

}

}

import javax.swing.JOptionPane;

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){我爱编程网

if(month>12)

this.month=month%12;

else

this.month=month;

}

private int dayOfMonth(){

int days=0;

switch(month){

case 1:days=31;break;

case 2:{

if(((year%4==0)&&(year%100!=0))||(year%400==0))

days=29;

else

days=28;

break;

}

case 3:days=31;break;

case 4:days=30;break;

case 5:days=31;break;

case 6:days=30;break;

case 7:days=31;break;

case 8:days=31;break;

case 9:days=30;break;

case 10:days=31;break;

case 11:days=30;break;

case 12:days=31;break;

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=1;i<7;i++){

if(i

str+=" ";

else{

str+=" "+j+" ";

j++;

}

}

str+="\n";

end:

for(int i=7-week+1;i<=this.dayOfMonth();){

for(int j=0;j<7;j++){

if(i<10)

str+=" "+i+" ";

else

str+=i+" ";

i++;

if(i>this.dayOfMonth())

break end;

}

str+="\n";

}

JOptionPane.showMessageDialog(null,str);

}

}