clear screen prompt using java code

[krunalpatel1410]

hi,
i want implement clear screen function in menu item ...
when click on clear screen menu then command prompt's all screen is clear . and command prompt display...

if it possible then guide(hint)/code for solution for this problem ..

as soon as possible...

please i m in big trouble...."

[paul pasciak]

Nobody can help you because they do not
know what you mean by a "screen."

Maybe it's a panel,
maybe it's a canvas,
maybe it's a frame,
maybe it's the console.

People may be waiting for a clearer
description of what you want to clear.

[toadaly]

My guess is you are referring to a terminal window? If so, then the simplest approach is to use Runtime.exec to issue the command, since it is platform specific.

[masijade]

System.out.println() about 100 times.

[krunalpatel1410]

hi,
sorry i m not specify ..
now...
when ever click on clear button then it clear the applet screen and reload and the command prompt session continue..

actually i m using command prompt in my applet ,,, i don't want to clear command prompt....but when clear button click then clear screen but prompt is running../
if u help then please give me idea for implementation or how i start..

[paul pasciak]

I will assume you already know how to make
your code respond to an actionEvent.

A tricky part of applets to to know that
they are ALWAYS clearing and repainting
themselves.

Your task is to interfer with this cycle somehow.
The cycle begins when the applet is nudged into
repainting itself.

You don't see this in your code, but the applet
jumps to code called "update(Graphics g)".
This code clears the applet, then jumps to
your "paint(Graphics g){ .. }" method.

My advice is that you play with the "update(Graphics g)"
method by overriding it. Try something like

public void update(Graphics g){
  setBackground(Color.orange);
  paint(g);
}

to get the feel of how it fits into the "paint(Graphics g)"
process.


Later, have your clearButton's actionListener set a

boolean eraseGraphics;

flag and experiment by testing this flag within
"the update(Graphics g)" method.

[krunalpatel1410]

hi,
thanks for giving this help..

but if u give one example code then easily understand..

menu is implemented in applet..

help me i m in trouble and i m in beginner in applet ......

[paul pasciak]

You might have several BIG issues that need
to be covered with your applet. I'm covering
one detail that you can easily experiment on
in your applet (by the way, I updated #6 in
this thread because I left out some important
parts).

The "update(Graphics g)" method is responsible
for clearing the applet's display. OVERRIDE IT
with this code:

public void update(Graphics g){
  setBackground(Color.orange);
  paint(g);
}

Then override it with this code:

public void update(Graphics g){
  setBackground(Color.black);
  paint(g);
}

Then override it with this code:

public void update(Graphics g){
  setBackground(Color.cyan);
  paint(g);
}

Then override it with this code:

public void update(Graphics g){
  setBackground(Color.red);
  paint(g);
}

This underscores a pivitol concept in
painting graphics in AWT. If you can't
do the above and gain anything from
it, this tells me something about you.

[krunalpatel1410]

hi,
thanks for this help..
i am join lots up forum ,but you give satisfy answer ..
if u give me whole code then i easily implemented ...
i m beginner.. i have no time to learn full applet stuff .....because.. i have dead line in my work...

i want to combine this code with my applet class..
which i m implement in my application which contain SSH/TELNET applet JTA26.jar file which provide facility for ssh connection to server.. with command prompt

so that's why i need complaint code ..because here very complexity to combine this code ....

i want to implement clear screen portion into my application menu...
so.. if you give complete code then it is good for me.

[paul pasciak]

I'm confused.
Your request sounds like this:

"I am a giant, as big as a mountain.
I need a bandage. I will not tell you
where I need the bandage, but I
insist that you find my wound and
mend it."

First I thought you referred to a simple
applet, now it sounds like you are
referring to complex, proprietary code.