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java的解释程序_JAVA改错和程序解释

發(fā)布時間：2024/2/28 编程问答 39 豆豆

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JAVA改錯和程序解釋

這是我看書打的,,但運行時有個錯誤....說符號找不到是什么原因..另外判斷秒針,分針,時針位置是怎么算來的,,看不懂,,希望明白的解釋下

import java.awt.*;

import java.util.Date;

import java.applet.Applet;

import java.util.Calendar;

import java.text.SimpleDateFormat;

public class CLOCK extends Applet implements??Runnable

{

private Thread athread;

private SimpleDateFormat sdateformat;

private int second_lastx=0,second_lasty=0;

private int minute_lastx=0,minute_lasty=0;

private int hour_lastx=0,hour_lasty=0;

public void??init(){

this.setBackground(Color.white);

this.athread=null;

this.sdateformat=new SimpleDateFormat("yyyy年mm月dd日hh時mm分ss秒a EEEEE");

}

public void paint(Graphics g)

{

Calendar rightnow=Calendar.getInstance();

int second=rightnow.get(Calendar.SECOND);

int minute=rightnow.get(Calendar.MINUTE);

int hour=rightnow.get(Calendar.HOUR);

int center_x=this.getWidth()/2;

int center_y=60;

int second_x=(int)(Math.cos(second*Math.PI/30-Math.PI/2)*45+center_x);

int second_y=(int)(Math.sin(second*Math.PI/30-Math.PI/2)*45+center_y);

int minute_x=(int)(Math.cos(minute*Math.PI/30-Math.PI/2)*40+center_x);

int minute_y=(int)(Math.sin(minute*Math.PI/30-Math.PI/2)*40+center_y);

int hour_x=(int)(Math.cos((hour*30+minute/2)*Math.PI/180-Math.PI/2)*30+center_x);

int hour_y=(int)(Math.sin((hour*30+minute/2)*Math.PI/180-Math.PI/2)*30+center_y);//這里是怎么來的？？

g.setFont(new Font("TimesRoman",Font.PLAIN,14));

g.setColor(Color.blue);

g.drawOval(center_x-50,center_y-50,100,100);

g.setColor(Color.darkGray);

g.drawString("9",center_x-45,center_y+3);

g.drawString("3",center_x+40,center_y+3);

g.drawString("12",center_x-5,center_y-37);

g.drawString("6",center_x-3,center_y+45);

g.setColor(this.getBackground());

if(second_x!=second_lastx||second_y!=second_lasty)

g.drawLine(center_x,center_y,second_lastx,second_lasty);

if(minute_x!=minute_lastx||minute_y!=minute_lasty)

{

g.drawLine(center_x,center_y-1,minute_lastx,minute_lasty);

g.drawLine(center_x-1,center_y,minute_lastx,minute_lasty);

}

if(hour_x!=hour_lastx||hour_lasty!=hour_lasty)

{

g.drawLine(center_x,center_y-1,hour_lastx,hour_lasty);

g.drawLine(center_x-1,center_y,hour_lastx,hour_lasty);

}

g.setColor(Color.darkGray);

g.drawString(sdateformat.format(new Date(),0,150));

g.setColor(Color.blue);

g.drawLine(center_x,center_y,second_x,second_y);

g.drawLine(center_x,center_y-1,minute_x,minute_y);

g.drawLine(center_x-1,center_y,minute_x,minute_y);

g.drawLine(center_x,center_y-1,hour_x,hour_y);

g.drawLine(center_x-1,center_y,hour_x,hour_y);

second_lastx=second_x;

second_lasty=second_y;

minute_lastx=minute_x;

minute_lasty=minute_y;

hour_lastx=hour_x;

hour_lasty=hour_y;

}

public void start()

{

if(athread==null)

{

athread=new Thread(this);

athread.start();

}

public void stop()

{

if(athread!=null)

{

athread.interrupt();

athread=null;

}

public void run()

{

while(athread!=null)

{

repaint();

try{

athread.sleep(1000);}

catch(InterruptedException e){

}

[[it] 本帖最后由 zacom 于 2008-10-2 22:06 編輯 [/it]]

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