I guess what I'm asking is....

[Ashanen]

....the simplest way to have a very small Java program (eg "hello world")
actually entered in a text area, and when an " execute button" is pressed, it
will actually execute it as a program.

At present I am using that the tasks for the button would have to include
saving the text area contents as a Java file, then calling a dos process
somehow to compile and execute it. But I am unclear on how to do that (get it
to call the DOS process). Or even whether this is the simplest way of doing
this!

 

[KC Wong]

...the simplest way to have a very small Java program (eg "hello world")

actually entered in a text area, and when an " execute button" is pressed, it
will actually execute it as a program.

At present I am using that the tasks for the button would have to include
saving the text area contents as a Java file, then calling a dos process
somehow to compile and execute it. But I am unclear on how to do that (get it
to call the DOS process). Or even whether this is the simplest way of doing
this!

That is already done and available for free...
Visit http://www.beanshell.org/ and see for yourself.

 

[Phil Earnhardt]

...the simplest way to have a very small Java program (eg "hello world")
actually entered in a text area, and when an " execute button" is pressed, it
will actually execute it as a program.

At present I am using that the tasks for the button would have to include
saving the text area contents as a Java file, then calling a dos process
somehow to compile and execute it. But I am unclear on how to do that (get it
to call the DOS process). Or even whether this is the simplest way of doing
this!

Servlet engines are essentially doing this: going through the
compile-execute process and running the code. If you are really doing
"Hello, world!" kind of text-based stuff, that's a way to do it.

--phil

 

[Andrew Thompson]

...the simplest way to have a very small Java program (eg "hello world")
actually entered in a text area, and when an " execute button" is pressed, it
will actually execute it as a program.

to compile it start here..
http://groups.google.com/[email protected]

 

[Ashanen]

Is there a simple way go call a dos process or get a windows bat file to
execute by an instruction in the event handler for a JButton?

 

[Herman Timmermans]

Is there a simple way go call a dos process or get a windows bat file to
execute by an instruction in the event handler for a JButton?

Yes, use something like this :

import Java.lang.*;
import Java.io.*;

public class RuntimeExecTest {
public static void main(String[] args) {
Runtime rt = Runtime.getRuntime();
String[] callAndArgs = { "Notepad.exe",
"D:\\TEMP\\Test.txt" };
try {
Process child = rt.exec(callAndArgs);
child.waitFor();
System.out.println("Process exit code is:
" + child.exitValue());
}
catch(IOException e) {
System.err.println(
"IOException starting process!");
}
catch(InterruptedException e) {
System.err.println(
"Interrupted waiting for process!");
}
}
}

Hope this helps you further, brgds Herman

 

[Ashanen]

Herman

Thank you for that information