效果圖:

主要思想：日歷最核心的功能就是能顯示某年某月對應的日期和星期幾。因此只要實現傳入具體的年份和月份，得到一組存放了日期的數組a[ ]即可。其中數組的大小設置成42，要考慮的問題是當月的第一天對應星期幾。日期數組中的前七個，肯定包含了當月的第一天，把這一天找到，將“1”填入，后面的日期依次累加直到加完該月最后一天為止。

MyCalendar類：

得到用于顯示日期數組a[ ]

import java.util.Calendar;public class MyCalendar {String day[];int year = 2020,month=0;public String[] getDay() {return day;}public void setDay(String[] day) {this.day = day;}public int getYear() {return year;}public void setYear(int year) {this.year = year;}public int getMonth() {return month;}public void setMonth(int month) {this.month = month;}private boolean isLeapYear() {if(this.year%4==0 && this.year%100!=0){return true;}else if(this.year%400==0){return true;}elsereturn false;}//獲得顯示數組public String[] getCalendar(){Calendar calendar=Calendar.getInstance();String a[]=new String[42];calendar.set(year,month-1,1);int weekday=calendar.get(Calendar.DAY_OF_WEEK)-1;int day=0;int days = 31;if (this.month == 4 || this.month == 6 || this.month == 9 || this.month == 11)days = 30;if (this.month == 2 && isLeapYear())days = 29;if (this.month == 2 && !isLeapYear())days = 28;for(int i = weekday,n=1;i< weekday +days;i++){a[i]=String.valueOf(n);n++;}return a;}}

MyFrame類：

創造顯示面板，主要用到JTable。

public class MyFrame extends JFrame implements ActionListener {//存儲數據MyCalendar calendar = new MyCalendar();JComboBox choiceYear,choiceMonth;JTable table = null;JPanel root = new JPanel();JLabel lyear, lmonth;private Object[] name = {'日','一','二','三','四','五','六'};private TableModel tableModel = new DefaultTableModel(name,6);// private static int row = 6;// private static int column = 7;public MyFrame(String title) {super(title);this.setContentPane(root);root.setLayout(new BorderLayout());//年月選擇欄choiceYear=new JComboBox();choiceMonth=new JComboBox();lyear=new JLabel('年');lmonth=new JLabel('月 ');for(int i=1990;i<2050;i++)choiceYear.addItem(i);choiceYear.addActionListener(this);for(int i=1;i<=12;i++)choiceMonth.addItem(i);choiceMonth.addActionListener(this);JPanel pNorth=new JPanel();pNorth.add(choiceYear);pNorth.add(lyear);pNorth.add(choiceMonth);pNorth.add(lmonth);root.add(pNorth,BorderLayout.NORTH);// 表格初始化setYearAndMonth( 1990, 1);}//設置年月日public void setYearAndMonth(int y,int m){calendar.setYear(y);calendar.setMonth(m);String day[]=calendar.getCalendar();Vector<Object> rowData = new Vector<>();int row = 0;int column = 0;for(int i = 0; i< 42; i++) {row = i / 7;column = i % 7;tableModel.setValueAt(day[i], row, column);}// 創建 JTable，直接重寫 isCellEditable()，設為不可編輯table = new JTable(tableModel){@Overridepublic boolean isCellEditable(int row, int column){return false;} };JScrollPane scrollPane = new JScrollPane(table);root.add(scrollPane, BorderLayout.CENTER);// 添加到主界面 table.setFillsViewportHeight(true); table.setRowSelectionAllowed(true); // 整行選擇table.setRowHeight(30); } public void actionPerformed(ActionEvent e){//選擇年份if (e.getSource()==choiceYear){calendar.setYear((Integer) choiceYear.getSelectedItem());String day[]=calendar.getCalendar();Vector<Object> rowData = new Vector<>();int row = 0;int column = 0;for(int i = 0; i< 42; i++) {row = i / 7;column = i % 7;tableModel.setValueAt(day[i], row, column);}table = new JTable(tableModel){@Overridepublic boolean isCellEditable(int row, int column){return false;} };JScrollPane scrollPane = new JScrollPane(table);root.add(scrollPane, BorderLayout.CENTER);// 添加到主界面 table.setFillsViewportHeight(true); table.setRowSelectionAllowed(true); // 整行選擇table.setRowHeight(30); }//選擇月份else if (e.getSource()==choiceMonth){calendar.setMonth((Integer) choiceMonth.getSelectedItem());String day[]=calendar.getCalendar();Vector<Object> rowData = new Vector<>();int row = 0;int column = 0;for(int i = 0; i< 42; i++) {row = i / 7;column = i % 7;tableModel.setValueAt(day[i], row, column);}}table = new JTable(tableModel){@Overridepublic boolean isCellEditable(int row, int column){return false;} };JScrollPane scrollPane = new JScrollPane(table);root.add(scrollPane, BorderLayout.CENTER);// 添加到主界面 table.setFillsViewportHeight(true); table.setRowSelectionAllowed(true); // 整行選擇table.setRowHeight(30); }}

ShowView類：

用于顯示窗口，照抄即可，無需理解。

import java.awt.Container;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;public class ShowView{ private static void createGUI() {// 語法：因為MyFrame是JFrame的子類，所以可以這么寫 JFrame frame = new MyFrame('日歷'); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 設置窗口的其他參數，如窗口大小 frame.setSize(400, 300);// 顯示窗口 frame.setVisible(true); } public static void main(String[] args) { // 此段代碼間接地調用了 createGUI()javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() {createGUI(); } }); }}

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