calendar_32_1.java

java做的一个日历

import java.applet.*;
import java.awt.*;
import java.util.Date;
public class Calendar_32_1 extends Applet
{
	Graphics g;
	Font font;
	FontMetrics font_metrics;
	Date current_date,month_to_show;
	//Date current_date;
	int width,height,year,month;
	//int width,height,year,month,date;
	int date,hour,minute,second;
	
	public void init()
	{
		g=getGraphics();
		current_date=new Date();
		year=current_date.getYear();
		month=current_date.getMonth();
		//date=current_date.getDay();
		date=current_date.getDate();
		hour=current_date.getHours();
		minute=current_date.getMinutes();
		second=current_date.getSeconds();
		month_to_show=new Date(year,month,1);
		
		Panel p=new Panel();
		add(p,"North");
		p.setBackground(Color.yellow);
		Button b1=new Button("<");
		p.add(b1);
		b1.setBackground(Color.yellow);
		Button b2=new Button(">");
		p.add(b2);
		b2.setBackground(Color.yellow);
	}
	
	public boolean action(Event e,Object o)
	{
		if(o.equals("<"))
		{
			if(--month<0)
			{
				month=11;
				year--;
			}
		}
		else
		{
			if(++month>11)
			{
				month=1;
				year++;
			}
		}
		/*year=current_date.getYear();
		month=current_date.getMonth();
		date=current_date.getDay();*/
		month_to_show=new Date(year,month,1);
		repaint();
		return true;
	}
	
	String day_of_week(int day)
	{
		switch(day)
		{
			case 0:return("Sun");
			case 1:return("Mon");
			case 2:return("Tue");
			case 3:return("Wed");
			case 4:return("Thu");
			case 5:return("Fri");
			default:return("Sat");
		}
	}
	
	String month_name(int month)
	{
		switch(month)
		{
			case 0:return("January");
			case 1:return("February");
			case 2:return("March");
			case 3:return("April");
			case 4:return("May");
			case 5:return("June");
			case 6:return("July");
			case 7:return("August");
			case 8:return("September");
			case 9:return("October");
			case 10:return("November");
			default:return("December");
		}
	}
	
	int number_of_days(int month,int year)
	{
		switch(month+1)
		{
			case 1:case 3:case 5:case 7:case 8:case 10:case 12:return(31);
			case 4:case 6:case 9:case 11:return(30);
			default:
			if((year%4==0&year%100!=0)||(year%400==0))return(29);
			else return(28);
			/*if(year%4!=0)return(28);
			else if(year%100!=0)return(29);
			else if(year%400!=0)return(28);
			else return(29);*/
		}
	}
	
	public void paint(Graphics g)
	{
		width=size().width;
		height=size().height;
		/*if(width<height)
		height=width;
		else width=height;*/
		g.setColor(Color.blue);
		//g.fillRect(0,0,size().width,size().height);
		g.fillRect(0,0,width,height);
		g.setColor(Color.white);
		for(int i=2;i<9;i++)
		{
			int y=(height*i)/8;
			g.drawLine(0,y,width,y);
		}
		int y=height/4;
		for(int i=0;i<8;i++)
		{
			int x=(width*i)/7;
			g.drawLine(x,y,x,height);
		}
		font=new Font("TimesRoman",Font.BOLD,height/20);
		g.setFont(font);
		font_metrics=g.getFontMetrics();
		/*g.drawString(month_name(current_date.getMonth())+" "+
		(1900+current_date.getYear()),0,height/8);*/
		g.drawString(month_name(month_to_show.getMonth())+" "+
		(1900+month_to_show.getYear()),0,height/8);
		g.drawString("今天此时的时间是 "+hour+":"+minute+":"+second,width*3/5,height/8);
		//y=height/4;
		for(int i=0;i<7;i++)
		g.drawString(day_of_week(i),(width*i)/7,y);
		int first_day=month_to_show.getDay();
		//int first=current_date.getDay();
		int last_day=number_of_days(month_to_show.getMonth(),month_to_show.getYear());
		//int last=number_of_days(current_date.getMonth(),current_date.getYear());
		y=(height*11)/32;
		for(int i=1;i<=last_day;i++)
		{
			if(date==i)
			{
				g.setColor(Color.green);
				g.setFont(new Font("TimesRoman",Font.BOLD,height/10));
			}
			else
			{
				g.setColor(Color.white);
				g.setFont(new Font("TimesRoman",Font.BOLD,height/20));
			}
			g.drawString(""+i,(width*first_day)/7,y);
			if(++first_day>6)
			{
				first_day=0;
				y+=height/8;
			}
		}
	}
}