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creating batch file for java application


this is in execute method()

 Process p = Runtime.getRuntime().exec(command, env);

System.out.println(r.execute(" C:\\Program Files\\Java\\jdk1.6.0_21\\bin\\javac demo.java” , null));
System.out.println(r.execute(" C:\\Program Files\\Java\\jdk1.6.0_21\\bin\\java demo”, null));

i want to run demo.java from this code i used timer class also.
i got the error "Illegal execution time" i dont know why
when i run this program in eclipse it does not give me output
but when i run this on command prompt then it gives me error
can anyone help me
Thanks in advanced!!!!!!!!


You seem to be having problems running DOS commands from within Java.

The problem is, you can't do that as if you were typing in command prompt.

This thread explains it short but with the essentials:

To create a batch file, simply open notepad, type the code you'd type in command prompt, save as, and end your file name with ".bat".

In case you have lots of code, it might be easier to make a batchfile, either through the method described above, or through Java IO to write the file, and execute that from within your java program.



i want to run demo.java from this code

Normally files with the .java extension contain text that is a source for a java program. You "run" the .class file that is created by the javac compiler.

If you want to "run"/execute the .class file you could call its main method directly:
demo.main(new String[]{});

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