Java写的日历小程序，算法效率虽然不算很高，却是简单实用的
CalendarBean.java
import java.util.Calendar;
public class CalendarBean
{
String day[];
int year=2005,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 date=Calendar.getInstance();
date.set(year,month-1,1);
int week=date.get(Calendar.DAY_OF_WEEK)-1;
int day=0;
//判断大月份
if(month==1||month==3||month==5||month==7
||month==8||month==10||month==12)
{
day=31;
}
//判断小月
if(month==4||month==6||month==9||month==11)
{
day=30;
}
//判断平年与闰年
if(month==2)
{
if(((year%4==0)&&(year%100!=0))||(year%400==0))
{
day=29;
}
else
{
day=28;
}
}
for(int i=week,n=1;i { a[i]=String.valueOf(n) ; n++; } return a; } } CalendarFrame.java import java.awt.*; import java.awt.event.*; import javax.swing.*; public class CalendarFrame extends JFrame implements ActionListener { JLabel labelDay[]=new JLabel[42]; JTextField text=new JTextField(10); JButton titleName[]=new JButton[7]; JButton button = new JButton(); String name[]={"日","一","二","三", "四","五","六"}; JButton nextMonth,previousMonth; int year=1996,month=1; //启动程序显示的日期信息 CalendarBean calendar; JLabel showMessage=new JLabel("",JLabel.CENTER); JLabel lbl1 = new JLabel("请输入年份："); JLabel lbl2=new JLabel(" "); public CalendarFrame() { JPanel pCenter=new JPanel(); //将pCenter的布局设置为7行7列的GridLayout 布局。 pCenter.setLayout(new GridLayout(7,7)); //pCenter添加组件titleName[i] for(int i=0;i<7;i++) { titleName[i]=new JButton(name[i]); pCenter.add(titleName[i]); } //pCenter添加组件labelDay[i] for(int i=0;i<42;i++) { labelDay[i]=new JLabel("",JLabel.CENTER); pCenter.add(labelDay[i]); } text.addActionListener(this); calendar=new CalendarBean(); calendar.setYear(year); calendar.setMonth(month); String day[]=calendar.getCalendar();