使用JComboBox关联三个日期选项_JAVA_编程开发_程序员俱乐部

在做Swing开发时，使用三个JComboBox分别表示年月日，而我们要实现的是当改变年份时，2月的天数可以随之改变。或者月份改变时，这个月的天数随之改变。

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cb_year = new JComboBox();
jp.add(cb_year);
cb_month = new JComboBox();
jp.add(cb_month);
cb_day = new JComboBox();
jp.add(cb_day);

for(int i = 2011; i>1940; i--)
	cb_year.addItem(i);
for(int i = 1; i<=12; i++)
	cb_month.addItem(i);
for(int i=1; i<=31;i++)
	cb_day.addItem(i);

cb_year.addActionListener(new ActionListener() {
	@Override
	public void actionPerformed(ActionEvent evt) {
		 JComboBox cb = (JComboBox) evt.getSource();
		Object newItem = cb.getSelectedItem();
		int days =   getDayByYearAndMonth(Integer.parseInt(newItem.toString())
       		       ,Integer.parseInt(cb_month.getSelectedItem().toString()));
      	   	cb_day.removeAllItems();
		for(int i=1; i<=days;i++)
		cb_day.addItem(i);
	}
});

cb_month.addActionListener(new ActionListener() {
	@Override
	public void actionPerformed(ActionEvent evt) {
		JComboBox cb = (JComboBox) evt.getSource();
		Object newItem = cb.getSelectedItem();
		int days = getDayByYearAndMonth(
                        Integer.parseInt(cb_year.getSelectedItem().toString())
			,Integer.parseInt(newItem.toString())
                );
		cb_day.removeAllItems();
		for(int i=1; i<=days;i++)
			cb_day.addItem(i);
		}
});

public static int getDayByYearAndMonth(int year,int month)
	{
		if(month==2) 
			if((year%4==0&&year%100!=0)||(year%100==0&&year%400==0))
				return 29;
			else return 28;
		else if(month==1 || month==3  || month==5 || month==7 || month==8 || month==10 || month==12)
			return 31;
		else return 30;		
	}

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?我对这些不熟，就算是抛砖引玉吧~~

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