Thus spake Hercule Li - TDC/BJ (hl108890@xxxxxxxxxxx):
> Hi Terry,
>
> The below is a java program , and it is a applet,
> so can't be run directly.
>
> Would you pls. tell me how to run it with netscape ?
>
> Thanks
> Dong
>
>
> import java.awt.*;
> import java.applet.*;
>
> public class Applet1 extends Applet {
> public void paint(Graphics g) {
> g.drawString("First applet", 10, 10);
> }
> } ///:~
I haven't too many experience of Java. But I have an example
that could show how to implement Java applet on web. A java
based program called DigitalClock.java (source code), compile
it to bycodes file - DigitalClock.class by using JDK, write
your HTML file including this java applet.
Source code is a little bit long. But it doesn't matter.
You can outline which part you need.
Cheers,
--
Terrence Miao
ITS of University of Macquarie ... __o
(03) 8344 0361 t.miao@xxxxxxxxxxxxxxxxxx ... -\<,
http://igloo.its.unimacq.edu.au ... (_)/(_) ..
DigitalClock.java
-----------------
import java.util.*;
import java.awt.*;
import java.applet.*;
import java.net.URL;
import java.net.MalformedURLException;
// Steffen Thorsen 1996
public class DigitalClock extends Applet implements Runnable {
Thread timer = null;
int width, height, tz ;
final int bars[]= {95,5,118,117,45,121,123,69,127,125,0};
Color CBack, CFront, CBorder;
int bwidth,bsize,bspace,bdsize,between,bulletsize,startdst,sluttdst, bordersize ;
int xoffset, yoffset, clockw, clockh;
Color far[];
String lastdate = "00:00:00" ,today=lastdate;
public void init() {
int x,y;
far=new Color[7];
bsize = readarg("barsize",8);
bwidth = readarg("barwidth", 3 );
bspace = readarg("barspace", 1 );
bulletsize = readarg("bulletsize",(1 + bsize/4));
between = readarg("between", (1 + bsize/4) );
bordersize = readarg("bordersize", 0);
startdst = readarg("dststart" ,0 );
sluttdst = readarg("dstend", 0);
if (bsize<2) {bsize=2;}
if (bwidth>bsize/2) {bwidth=bsize/2;}
bdsize=bsize-1;
CFront=colorFromString(getParameter("text"),Color.black);
CBack=colorFromString(getParameter("bgcolor"),Color.lightGray);
CBorder=colorFromString(getParameter("bordercolor"),Color.blue);
Date dat = new Date(); tz = -dat.getTimezoneOffset();
if (((tz+1000) % 10)==9) {tz++;}
String un = getParameter("tz"); if (un != null) {tz=(Integer.valueOf(un).intValue());};
tz*=60;
clockw=(int) 6*bsize+bulletsize*2+12*bspace+7*between;
/*=6*(bsize+bspace*2+between) + (between+bsize/4+1)*2;*/
clockh=3*bspace+2*bsize;
width=size().width; height=size().height;
xoffset=(width-clockw)/2;
yoffset=(height-clockh)/2;
calcval();
}
private int readarg(String argtext, int defverdi) {
String argvalue = getParameter(argtext);
return( (argvalue == null) ? defverdi : (Integer.valueOf(argvalue).intValue()));
}
private void calcval() {
String ts, tm, tt;
int s, m, h;
Date dat = new Date();
int tid=(int) (System.currentTimeMillis() /1000) + tz;
if ((tid>=startdst)&&(tid<sluttdst)) {tid+=3600;}
s=tid % 86400;
h=s / 3600;
m=(s % 3600)/60;
s%=60;
ts = String.valueOf(s);
tm = String.valueOf(m);
tt = String.valueOf(h);
if(s<10) {ts = "0" + ts;}
if(m<10) {tm = "0" + tm;}
if(h<10) {tt = "0" + tt;}
today = tt + ":" + tm + ":" + ts + "--------";
}
public void update(Graphics g) {
calcval();
tegnny(g,true);
}
public void paint(Graphics g) {
if (bordersize>0) {
g.setColor(CBorder);
g.fillRect(0,0,width,height);
}
g.setColor(CBack);
g.fillRect(bordersize,bordersize,width-bordersize*2,height-bordersize*2);
tegnny(g,false);
}
public boolean mouseDown(java.awt.Event evt, int x, int y) {
try {
URL homepage=new URL("http://www.stud.unit.no/USERBIN/steffent/javaclock.pl";);
getAppletContext().showDocument(homepage);
}
catch (MalformedURLException e){}
return true;
}
private void tegnny(Graphics g,boolean ny) {
int a, b, xh;
xh = xoffset ;
for(int i=0; i<8 ; i++) {
a=(int) today.charAt(i) ;
b=(int) lastdate.charAt(i) ;
if ((a>47) && (a<58)) {
if ((b!=a)|| (!ny)) {
tegndigit(g,true,xh,a-48);}
xh+=bsize+bspace*2+between;
}
else {
if (!ny) {
g.setColor(CFront);
g.fillOval(xh+(between-bulletsize)/2,bsize*2/3+yoffset,bulletsize,bulletsize);
g.fillOval(xh+(between-bulletsize)/2,bspace+bsize*4/3+yoffset,bulletsize,bulletsize);
}
xh+=between+bulletsize;
}
}
lastdate = today;
}
private void tegndigit(Graphics g,boolean ny,int x,int val) {
int y=yoffset,x0,y0,bw2;
int offy=1- bwidth % 2;
int x2=bspace*2+bsize-1;
int y2=bspace*2+bsize+offy+y-1;
int y3=y2+bspace+bsize;
int y1=bspace/2+bspace+bsize+y;
val=bars[val];
for(x0=0;x0<7;x0++) {
far[x0]=(val>63) ? CFront : CBack;
val=(val % 64)*2;
}
// Overste
g.setColor(far[0]);
for(x0=0;x0<bwidth;x0++) { g.drawLine(x+bspace+x0,y+x0,x+bspace+bdsize-x0,y+x0);}
// Vertikale overst
g.setColor(far[3]);
for(x0=0;x0<bwidth;x0++) {g.drawLine(x+x0,y+bspace+x0,x+x0,y+bdsize+bspace-x0);}
g.setColor(far[4]);
for(x0=0;x0<bwidth;x0++) {g.drawLine(x+x2-x0,y+bspace+x0,x+x2-x0,y+bdsize+bspace-x0);}
// Midt-planken
g.setColor(far[1]);
bw2=(bwidth+1)/2;
for(x0=0;x0<bw2;x0++) {
g.drawLine(x+bspace+x0,y1-x0,x+bspace+bdsize-x0,y1-x0);
g.drawLine(x+bspace+x0,y1+offy+x0,x+bspace+bdsize-x0,y1+offy+x0);
}
// Nederste
g.setColor(far[5]);
for(x0=0;x0<bwidth;x0++) {g.drawLine(x+x0,y2+bspace+x0,x+x0,y2+bdsize+bspace-x0);}
g.setColor(far[6]);
for(x0=0;x0<bwidth;x0++) {g.drawLine(x+x2-x0,y2+bspace+x0,x+x2-x0,y2+bdsize+bspace-x0);}
g.setColor(far[2]);
for(x0=0;x0<bwidth;x0++) {g.drawLine(x+bspace+x0,y3-x0,x+bdsize+bspace-x0,y3-x0);}
}
private Color colorFromString(String s,Color defaultColor) {
Integer i;
try {
i=Integer.valueOf(s,16);
return new Color(i.intValue());
} catch (NumberFormatException e) {return defaultColor;}
}
public void start() {
if(timer == null)
{
timer = new Thread(this);
timer.start();
}
}
public void stop() {
timer = null;
}
public void run() {
while (timer != null) {
try {Thread.sleep((int) (1020 - System.currentTimeMillis() % 1000));} catch (InterruptedException e){}
repaint();
}
timer = null;
}
}
DigitalClock.html
-----------------
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Microsoft FrontPage 2.0">
<title></title>
</head>
</body>
<P>
<APPLET WIDTH=88 HEIGHT=20 CODE="DigitalClock.class"></APPLET>
</P>
</body>
</html>
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