效果圖:

主要思想：日曆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陣列a[ ]即可。其中陣列的大小設定成42，要考慮的問題是當月的第一天對應星期幾。日期陣列中的前七個，肯定包含了當月的第一天，把這一天找到，將“1”填入，後面的日期依次累加直到加完該月最後一天為止。

MyCalendar類：

得到用於顯示日期陣列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;
}else

return false;
}


//獲得顯示陣列
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 {
//儲存資料
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);



}

//設定年月日
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);

}


// 建立 JTable，直接重寫 isCellEditable()，設為不可編輯
table = new JTable(tableModel){
@Override
public boolean isCellEditable(int row,int column)
{
return false;
}  
};
JScrollPane scrollPane = new JScrollPane(table);
root.add(scrollPane,BorderLayout.CENTER);

// 新增到主介面  
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],column);

}
table = new JTable(tableModel){
@Override
public boolean isCellEditable(int row,BorderLayout.CENTER);

// 新增到主介面  
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],column);

}
}
table = new JTable(tableModel){
@Override
public boolean isCellEditable(int row,BorderLayout.CENTER);

// 新增到主介面  
table.setFillsViewportHeight(true);  
table.setRowSelectionAllowed(true); // 整行選擇
table.setRowHeight(30);  

}


}

ShowView類：

用於顯示視窗，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，所以可以這麼寫
    JFrame frame = new MyFrame("日曆");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    
    // 設定視窗的其他引數，如視窗大小
    frame.setSize(400,300);
    
    // 顯示視窗
    frame.setVisible(true);
    
    
  }
  
  public static void main(String[] args)
  {
    // 此段程式碼間接地呼叫了 createGUI()
    
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run()
      {
        createGUI();
      }
    });

  }
}

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