HELP for Compile java programe !

Question

Hello All,
i want to make java programe by which i can compile java programes
and when i compile java programe from my programe then
i shoul get compiled status means programe compile successfuly
or not compile.
if any example i m thanksfull.
onlyforjava.

Answer 1

how about if compile fail?
the process obj seems return value 0 as it run successful.
I haven't try this, but I have experienced the process obj returns 0 if the executed command has some routine to handle error cases, in which, error will not halt the system.
So, I recommand the following scenario.
1. let say, if your java is test.java. check the existence of file test.class.
If, it exists, get its modified time.
2. compile the java code with
Procress p = Runtime.exec(new String[]{"javac", "test.java"});
3. get the error string if any.
InputStream in = new BufferedInputStream(p.getInputStream());int read;while ((read = in.read()) != -1){  System.out.println((char)read);}
4. handle error with the exitValue
if (p.exitValue() != 0){  System.out.println("warning.");}
5. check again the file test.class if it is a newly created file.
6. if it is newly created, compile success. Else, failed.