//我在swing中创建自定义jcalender
//我在设置日期方面遇到问题 //i.e实际月份从星期二开始，从星期三开始 //我发现有关在日历模型中设置值的问题
//上面的代码运行正常但显示实际日期有问题 //请建议我做一些必要的修改
import java.awt.Color;
public class Calendar extends JFrame {
private JPanel contentPane;
String[] years = { "2008", "2009", "2010" ,"2011","2012","2013","2014"};
JComboBox comboBox = new JComboBox(years);
String[] months = { "January", "February", "March", "April", "May", "June", "July", "August",
"September", "October", "November", "December" };
JList list = new JList(months);
JScrollPane scrollPane = new JScrollPane(list);
CalendarModel model = new CalendarModel();
JTable table = new JTable(model);
public Calendar() {
super();
getContentPane().setLayout(null);
comboBox.setBounds(10, 10, 100, 30);
comboBox.setSelectedIndex(5);
comboBox.addItemListener(new ComboHandler());
scrollPane.setBounds(200, 10, 150, 100);
list.setSelectedIndex(10);
list.addListSelectionListener(new ListHandler());
table.setBounds(10, 150, 550, 200);
model.setMonth(comboBox.getSelectedIndex() + 1998, list.getSelectedIndex());
getContentPane().add(comboBox);
getContentPane().add(scrollPane);
table.setGridColor(Color.black);
table.setShowGrid(true);
getContentPane().add(table);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(530,300);
setVisible(true);
}
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Calendar frame = new Calendar();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public class ComboHandler implements ItemListener {
public void itemStateChanged(ItemEvent e) {
System.out.println("ItemState change Method called ");
model.setMonth(comboBox.getSelectedIndex() + 1998, list.getSelectedIndex());
table.repaint();
}
}
public class ListHandler implements ListSelectionListener {
public void valueChanged(ListSelectionEvent e) {
model.setMonth(comboBox.getSelectedIndex() + 1998, list.getSelectedIndex());
table.repaint();
}
}
}
class CalendarModel extends AbstractTableModel {
String[] days = { "Sun" , "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
int[] numDays = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
String[][] calendar = new String[7][7];
public CalendarModel() {
//setting name of days (mon,tues)
for (int i = 0; i < days.length; ++i)
{
System.out.println("day[i] *** "+days[i]);
calendar[0][i] = days[i];
}
for (int i = 1; i < 7; ++i){
for (int j = 0; j < 7; ++j)
{
System.out.println("calendar[i][j] value i ** "+i +" j value "+ j );
calendar[i][j] = " ";
}
}
}
public int getRowCount() {
return 7;
}
public int getColumnCount() {
return 7;
}
public Object getValueAt(int row, int column) {
System.out.println("get Value at ** "+calendar[row][column]);
return calendar[row][column];
}
/*
public void setValueAt(Object value, int row, int column) {
System.out.println("set Value at ** "+(String) value);
calendar[row][column] = (String) value;
}*/
public void setMonth(int year, int month) {
for (int i = 1; i < 7; ++i)
{
for (int j = 0; j < 7; ++j)
{
calendar[i][j] = " ";
}
}
java.util.GregorianCalendar cal = new java.util.GregorianCalendar();
cal.set(year, month, 1);
int offset = cal.get(java.util.GregorianCalendar.DAY_OF_WEEK) - 1;
offset += 7;
int num = daysInMonth(year, month);
for (int i = 0; i < num; ++i) {
System.out.println("offset *** "+Integer.toString(i+1));
calendar[offset / 7][offset % 7] = Integer.toString(i+1);
++offset;
}
}
public boolean isLeapYear(int year) {
System.out.println("Is Leap Year *** ");
if (year % 4 == 0)
return true;
return false;
}
public int daysInMonth(int year, int month) {
System.out.println("day In month*** ");
int days = numDays[month];
if (month == 1 && isLeapYear(year))
++days;
System.out.println("days *** "+days);
return days;
}
}
答案 0 :(得分：2)
我不知道这些是否相关但是......
public void itemStateChanged(ItemEvent e) {
int index = comboBox.getSelectedIndex();
System.out.println("index = " + index + "; " + (index + 1998));
model.setMonth(comboBox.getSelectedIndex() + 1998, list.getSelectedIndex());
table.repaint();
}
不会产生与组合框中列出的结果相匹配的结果。例如，如果您选择第一个值，则它将等于1998，而不是2008
因此，如果我从组合框中选择2013，我实际上是2003。
当我将其更改为
时public void itemStateChanged(ItemEvent e) {
int index = comboBox.getSelectedIndex();
System.out.println("index = " + index + "; " + (index + 2008));
model.setMonth(comboBox.getSelectedIndex() + 2008, list.getSelectedIndex());
table.repaint();
}
它给了我更好的结果。
我也改变了
java.util.GregorianCalendar cal = new java.util.GregorianCalendar();
到
java.util.Calendar cal = java.util.Calendar.getInstance();
如果可能，您应该避免对用户日历系统做出假设......
我也会避免null布局;）
您还应该避免在更改表格模型时调用table.repaint，而是尝试使用fireTableDataChanged方法中的setMonth
我个人会在设置选定索引之前将侦听器添加到组合框和JList，这将允许侦听器为您更新模型...
您还需要修复ListHandler，以便2008使用1998
答案 1 :(得分：1)
在setMonth方法中试试这个
public void setMonth(int year, int month)
更改
calendar[offset / 7][offset % 7] = Integer.toString(i+1);
要
calendar[offset / 7][offset % 7] = Integer.toString(i+2);
答案 2 :(得分：0)
试试这个..在偏移计算中使用 - 2 而不是 - 1 。
java.util.GregorianCalendar cal = new java.util.GregorianCalendar();
cal.set(year, month, 1);
int offset = cal.get(java.util.GregorianCalendar.DAY_OF_WEEK)- 2 ;
offset += 7;
int num = daysInMonth(year, month);
for (int i = 0; i < num; ++i) {
System.out.println("offset *** "+Integer.toString(i+1));
calendar[offset / 7][offset % 7] = Integer.toString(i+1);
++offset;