Java 日历的小程序

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

1. import java.util.Calendar;   
2.  
3. public class CalendarBean   
4. {   
5.        String day[];   
6.        int year=2005,month=0;          
7.        public void setYear(int year)   
8.        {   
9.            this.year=year;   
10.        }   
11.          
12.        public int getYear()   
13.        {   
14.            return year;   
15.        }   
16.          
17.        public void setMonth(int month)   
18.        {   
19.            this.month=month;   
20.        }   
21.          
22.        public int getMonth()   
23.        {   
24.            return month;   
25.        }   
26.          
27.        public String[] getCalendar()   
28.        {   
29.            String a[]=new String[42];   
30.            Calendar date=Calendar.getInstance();   
31.            date.set(year,month-1,1);   
32.            int week=date.get(Calendar.DAY_OF_WEEK)-1;   
33.            int day=0;   
34.             
35.            //判断大月份  
36.            if(month==1||month==3||month==5||month==7 
37.              ||month==8||month==10||month==12)   
38.            {   
39.                day=31;   
40.            }   
41.              
42.            //判断小月  
43.            if(month==4||month==6||month==9||month==11)   
44.            {   
45.                day=30;   
46.            }   
47.              
48.            //判断平年与闰年  
49.            if(month==2)   
50.            {   
51.                if(((year%4==0)&&(year%100!=0))||(year%400==0))   
52.                {   
53.                    day=29;   
54.                }   
55.                  
56.                else   
57.                {   
58.                    day=28;   
59.                }   
60.             }   
61.              
62.            for(int i=week,n=1;i<week+day;i++)   
63.            {   
64.                    a[i]=String.valueOf(n) ;   
65.                    n++;   
66.            }              
67.            return a;   
68.         }   
69. }  

CalendarFrame.java

1. import java.awt.*;   
2. import java.awt.event.*;   
3. import javax.swing.*;  
4.  
5. public class CalendarFrame extends JFrame implements ActionListener   
6. {   
7.        JLabel labelDay[]=new JLabel[42];   
8.        JTextField  text=new JTextField(10);  
9.        JButton titleName[]=new JButton[7];   
10.        JButton button = new JButton();  
11.        String name[]={"日","一","二","三", "四","五","六"};   
12.        JButton nextMonth,previousMonth;   
13.        int year=1996,month=1; //启动程序显示的日期信息  
14.        CalendarBean calendar;   
15.        JLabel showMessage=new JLabel("",JLabel.CENTER);   
16.        JLabel lbl1 = new JLabel("请输入年份：");  
17.        JLabel lbl2=new JLabel("      ");  
18.  
19.        public CalendarFrame()   
20.        {   
21.            JPanel pCenter=new JPanel();   
22.              
23.          //将pCenter的布局设置为7行7列的GridLayout 布局。   
24.            pCenter.setLayout(new GridLayout(7,7));    
25.              
26.          //pCenter添加组件titleName[i]  
27.            for(int i=0;i<7;i++)   
28.            {   
29.                titleName[i]=new JButton(name[i]);   
30.                pCenter.add(titleName[i]);   
31.            }   
32.  
33.          //pCenter添加组件labelDay[i]  
34.            for(int i=0;i<42;i++)   
35.            {   
36.                labelDay[i]=new JLabel("",JLabel.CENTER);   
37.                pCenter.add(labelDay[i]);  
38.            }   
39.              
40.            text.addActionListener(this);  
41.            calendar=new CalendarBean();   
42.            calendar.setYear(year);   
43.            calendar.setMonth(month);   
44.            String day[]=calendar.getCalendar();   
45.  
46.            for(int i=0;i<42;i++)   
47.            {   
48.                labelDay[i].setText(day[i]);   
49.            }   
50.  
51.            nextMonth=new JButton("下月");   
52.            previousMonth=new JButton("上月");   
53.            button=new JButton("确定");  
54.              
55.            //注册监听器  
56.            nextMonth.addActionListener(this);   
57.            previousMonth.addActionListener(this);   
58.            button.addActionListener(this);  
59.              
60.            JPanel pNorth=new JPanel(),  
61.            pSouth=new JPanel();   
62.            pNorth.add(showMessage);    
63.            pNorth.add(lbl2);    
64.            pNorth.add(previousMonth);   
65.            pNorth.add(nextMonth);   
66.            pSouth.add(lbl1);          
67.            pSouth.add(text);  
68.            pSouth.add(button);  
69.            showMessage.setText("日历："+calendar.getYear()+"年"+ calendar.getMonth()+"月" );  
70.            ScrollPane scrollPane=new ScrollPane();   
71.            scrollPane.add(pCenter);   
72.            add(scrollPane,BorderLayout.CENTER);// 窗口添加scrollPane在中心区域   
73.            add(pNorth,BorderLayout.NORTH);// 窗口添加pNorth 在北面区域   
74.            add(pSouth,BorderLayout.SOUTH);// 窗口添加pSouth 在南区域。  
75.  
76.         }   
77.         
78.         public void actionPerformed(ActionEvent e)   
79.         {   
80.             if(e.getSource()==nextMonth)   
81.             {   
82.                 month=month+1;   
83.                 if(month>12)   
84.                 month=1;   
85.                 calendar.setMonth(month);   
86.                 String day[]=calendar.getCalendar();   
87.  
88.                 for(int i=0;i<42;i++)   
89.                 {  
90.                     labelDay[i].setText(day[i]);   
91.                 }   
92.              }   
93.             else if(e.getSource()==previousMonth)   
94.             {   
95.                 month=month-1;                
96.                 if(month<1)   
97.                 month=12;   
98.                 calendar.setMonth(month);   
99.                 String day[]=calendar.getCalendar();   
100.  
101.                 for(int i=0;i<42;i++)   
102.                 {   
103.                     labelDay[i].setText(day[i]);   
104.                 }   
105.              }   
106.             else if(e.getSource()==button)  
107.             {  
108.                 month=month+1;                
109.                 if(month>12)                  
110.                       month=1;                
111.                 calendar.setYear(Integer.parseInt(text.getText()));               
112.                 String day[]=calendar.getCalendar();                  
113.                 for(int i=0;i<42;i++)  
114.                 {  
115.                     labelDay[i].setText(day[i]);  
116.                 }  
117.             }  
118.           showMessage.setText("日历："+calendar.getYear()+"年"+calendar.getMonth()+"月" );   
119.        }   
120. }   
121.  
122.    

CalendarMainClass .java

1. import javax.swing.JFrame;  
2. import javax.swing.UIManager;  
3.  
4. public class CalendarMainClass   
5. {   
6.         public static void main(String args[])   
7.         {   
8.              try {  
9.                  UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); //windows界面风格  
10.               }catch (Exception e) {  
11.                 e.printStackTrace();  
12.               }  
13.               CalendarFrame frame=new CalendarFrame();   
14.               frame.setBounds(100,100,360,300);   
15.               frame.setTitle("日历小程序");  
16.               frame.setLocationRelativeTo(null);//窗体居中显示  
17.               frame.setVisible(true);   
18.               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
19.         }   
20. }  

程序的效果图：

本文转自 lingdududu 51CTO博客，原文链接：