最近忽然对Java萌生了极大的兴趣，之前有选修过Java课程但是没怎么认真学，但近日不知因何迷恋上了Java，因此我趁热打铁，天天钻研Java，编写程序，下面是我学习过程中自己写一个练习作，实现了一个带界面的日历，在此与广大程序爱好者分享一下，希望大家多多指教：

程序界面:

http://s12/middle/6759f4614850e63cba02b&690

//DataTime.java

import java.util.*;

public class DateTime
{
 Calendar date=Calendar.getInstance();
 isLeapYear leapYear=new isLeapYear();
 int year,month,dayofweek,februaryDays;
 String monthDays[];

 DateTime(int year,int month)
 {
     this.year=year;
  this.month=month;
  date.set(year,month-1,1);
  dayofweek=date.get(Calendar.DAY_OF_WEEK)-1;
  if(leapYear.isLeapYear(year))
   februaryDays=28;
  else
   februaryDays=29;
 }

 public String[] getMonthDays()
 {
     if(month==2)
   monthDays=new String[dayofweek+februaryDays];
  else if(month==4||month==6||month==9||month==11)
   monthDays=new String[dayofweek+30];
  else
   monthDays=new String[dayofweek+31];
  
  for(int i=0;i<dayofweek;i++)
   monthDays[i]="**";
  for(int i=dayofweek,n=1;i<monthDays.length;i++)
  {
      if(n<=9)
    monthDays[i]=" "+String.valueOf(n);
   else
    monthDays[i]=String.valueOf(n);
   n++;
  }
  return monthDays;

 }
}

//WindowCalendar.java  此文件为主程序

import java.awt.*;
import java.awt.event.*;
import javax.swing.JOptionPane;
//import java.util.*;

class Win extends Frame implements ItemListener,MouseListener,Runnable
{
 int monthes,year,day;
 Thread threadTime;
 DateTime dateTime;
 NowDate nowDate=new NowDate();
 SureExit sureExit;
 Choice choiceMonth;
 List   yearList;
 TextArea text;
 TextField textTime,textNowDate;
 Panel panelDate,panelNorth,panelTime,panelNowDate;
 Label label=new Label("^_^**********日期**********^_^");
 Label labelTime=new Label("时间：");
 Label labelNowDate=new Label("当前日期：");
 String month[]={"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"};
    String monthDays[];
 String nowMonthDays[];

 Win(String s)
 {
  super(s);
  threadTime=new Thread(this);
     choiceMonth=new Choice();
  yearList=new List(1,false);
  text=new TextArea(7,22);
  textTime=new TextField(15);
  textNowDate=new TextField(12);
  panelDate=new Panel();
  panelNorth=new Panel();
  panelTime=new Panel();
  panelNowDate=new Panel();
  sureExit=new SureExit(this,"确定对话框",false);

        for(int i=0;i<12;i++)
   choiceMonth.add(""+month[i]);
  for(int i=1900;i<=2100;i++)
   yearList.add(""+i);
  panelDate.add(label);
  panelNowDate.add(labelNowDate);
  panelNowDate.add(textNowDate);
  add(panelDate);
  panelNorth.add(yearList);
  panelNorth.add(choiceMonth);
  add(panelNorth);
  add(text);
  add(panelNowDate);
  add(labelTime);
  add(textTime);
  
  choiceMonth.addItemListener(this);
  yearList.addItemListener(this);
  textTime.addMouseListener(this);
  addWindowListener(new WindowAdapter()
                    {
                        public void windowClosing(WindowEvent e)
         {
         
          sureExit.setVisible(true);
         }
        });

        Font font=new Font("宋体",Font.PLAIN,15);
        text.setFont(font);
  text.setBackground(Color.cyan);
  text.setForeground(Color.red);
  Font f=new Font("黑体",Font.BOLD,15);
  label.setFont(f);
  labelTime.setFont(f);
  labelNowDate.setFont(f);
  labelNowDate.setForeground(Color.blue);
  label.setForeground(Color.blue);
  labelTime.setForeground(Color.blue);
  labelTime.setBackground(Color.orange);
  labelNowDate.setBackground(Color.orange);
  label.setBackground(Color.orange);
  
  text.setEditable(false);
  textTime.setEditable(false);
  textTime.setForeground(Color.red);
  textTime.setFont(f);
  textTime.setBackground(Color.green);
  textNowDate.setEditable(false);
  textNowDate.setForeground(Color.red);
  textNowDate.setBackground(Color.green);
  textNowDate.setFont(f);
  
  choiceMonth.select(nowDate.getMonth()-1);
  int y=nowDate.getYear()-1900;
  yearList.select(y);
  day=nowDate.getDay();
  int m=nowDate.getMonth();
  y=y+1900;
  textNowDate.setText(""+y+"年"+m+"月"+day+"日");
  setMonthDays();
  
  setLayout(new FlowLayout());
  setBounds(200,150,250,330);
  setVisible(true);
  validate();
  
  threadTime.start();
 }

 public void run()
 {
     while(true)
  {
   java.util.Date date=new java.util.Date();
   Dates dates=new Dates();
   String time=date.toString().substring(11,19);
   textNowDate.setText(dates.year+"年"+dates.month+"月"+dates.day+"日");
   textTime.setText(time+"  星期"+dates.week);
   try
   {
    threadTime.sleep(1000);
   }
   catch (InterruptedException e)
   {
   }

  }
 }

 public void mouseEntered(MouseEvent e)
 {
     TextField text1=(TextField)e.getSource();
  text1.setBackground(Color.cyan);
 }

 public void mouseExited(MouseEvent e)
 {
     TextField textField=(TextField)e.getSource();
  textField.setBackground(Color.green);
 }

 public void mouseReleased(MouseEvent e){}
 public void mousePressed(MouseEvent e){}
 public void mouseClicked(MouseEvent e){}

 public void setMonthDays()
 {
  text.setText("日 一 二  三 四 五 六");
  
  nowMonthDays=nowDate.getMonthDays();
  for(int i=0;i<nowMonthDays.length;i++)
  {
      if(i%7==0)
    text.append("\n");
   text.append(""+nowMonthDays[i]+" ");
  }
 }

 public void itemStateChanged(ItemEvent e)
 {
     monthes=choiceMonth.getSelectedIndex()+1;
  year=1900+yearList.getSelectedIndex();
  dateTime=new DateTime(year,monthes);
  monthDays=dateTime.getMonthDays();
  
  text.setText("日 一 二  三 四 五 六");
  for(int i=0;i<monthDays.length;i++)
  {
      if(i%7==0)
    text.append("\n");
   text.append(""+monthDays[i]+" ");
  }
 }
}

class WindowCalendar
{
 public static void main(String[] args)
 {
  Win win=new Win("日期和时间");
 }
}
//isLeapYear.java

public class isLeapYear
{
 boolean isLeapYear(int year)
 {
   if(year%4==0&&year%100!=0||year%400==0)
    return true;
   else
    return false;
 }
}

//NowDate.java

import java.util.*;

public class NowDate
{
 Calendar nowDate=Calendar.getInstance();
 int day,month,year,dayofweek,februaryDays,hour,minute,second;
 isLeapYear leapYear=new isLeapYear();
 String monthDays[];
 NowDate()
 {
     month=nowDate.get(Calendar.MONTH)+1;
  year=nowDate.get(Calendar.YEAR);
  day=nowDate.get(Calendar.DAY_OF_MONTH);
  hour=nowDate.get(Calendar.HOUR_OF_DAY);
  minute=nowDate.get(Calendar.MINUTE);
  second=nowDate.get(Calendar.SECOND);
  nowDate.set(year,month-1,1);
  dayofweek=nowDate.get(Calendar.DAY_OF_WEEK)-1;
 }

 public String[] getMonthDays()
 {
     if(leapYear.isLeapYear(year))
   februaryDays=28;
  else
   februaryDays=29;

  if(month==2)
   monthDays=new String[28+dayofweek];
  else if(month==4||month==6||month==9||month==11)
   monthDays=new String[30+dayofweek];
  else
   monthDays=new String[31+dayofweek];

        for(int i=0;i<dayofweek;i++)
   monthDays[i]="**";
       
  for(int i=dayofweek,n=1;i<monthDays.length;i++)
  {
      if(i<=9)
    monthDays[i]=" "+String.valueOf(n);
   else
    monthDays[i]=String.valueOf(n);
   n++;
  }
  return monthDays;
 }

 public int getMonth()
 {
     return month;
 }

 public int getYear()
 {
     return year;
 }

 public int getDay()
 {
     return day;
 }

 public int getHour()
 {
     return hour;
 }
 
 public int getMinute()
 {
     return minute;
 }

 public int getSecond()
 {
     return second;
 }
}
//SureExit.java

import java.awt.*;
import java.awt.event.*;

public class SureExit extends Dialog implements ActionListener
{
 static final int YES=1,NO=0;
 int message=-1;
 Button buttonYes,buttonNo;
 Panel panelButton,panelLabel;
 Label label=new Label("确定退出？",Label.CENTER);
 SureExit(Frame f,String s,boolean b)
 {
  super(f,s,b);
     buttonYes=new Button("Yes");
  buttonNo=new Button("No");
  panelButton=new Panel();
  panelLabel=new Panel();
  

  panelLabel.add(label);
  panelButton.add(buttonYes);
  panelButton.add(buttonNo);
  add(panelLabel);
  add(panelButton);

  buttonYes.addActionListener(this);
  buttonNo.addActionListener(this);
  addWindowListener(new WindowAdapter()
                    {
                        public void windowClosing(WindowEvent e)
         {
             setVisible(false);
         }
        });

  setLocation(250,200);
  setSize(140,120);
  setLayout(new FlowLayout());
 }

 public void actionPerformed(ActionEvent e)
 {
     if(e.getSource()==buttonYes)
  {
      message=YES;
   System.exit(0);
   setVisible(false);
  }
  else if(e.getSource()==buttonNo)
  {
      message=NO;
   setVisible(false);
  }
 }

 public int getMessage()
 {
     return message;
 }
}
//Dates.java

import java.util.*;

class Dates
{
 String year,month,day,week;
 Dates()
 {
     Calendar calendar=Calendar.getInstance();
     calendar.setTime(new Date());
     year=String.valueOf(calendar.get(Calendar.YEAR));
  month=String.valueOf(calendar.get(Calendar.MONTH)+1);
  day=String.valueOf(calendar.get(Calendar.DAY_OF_MONTH));
  week=String.valueOf(calendar.get(Calendar.DAY_OF_WEEK)-1);
 }
}