Hello, can anyone tell me how I can convert a .java file into .class file with an executable bytecode.
Thanks
+1
A:
To get a .class file you have to compile the .java file.
The command for this is javac. The manual for this is found here (Windows)
In short:
javac File.java
Peter Smit
2009-08-18 20:20:03
+4
A:
Use the javac program that comes with the JDK (visit java.sun.com if you don't have it). The installer does not automatically add javac to your system path, so you'll need to add the bin directory of the installed path to your system path before you can use it easily.
Jonathan
2009-08-18 20:20:17
+15
A:
A .java file is the code file.
A .class file is the compiled file.
It's not exactly "conversion" - it's compilation. Suppose your file was called "herb.java", you would write (in the command prompt):
javac herb.java
It will create a herb.class file in the current folder.
It is "executable" only if it contains a static void main(String[]) method inside it. If it does, you can execute it by running (again, command prompt:)
java herb
Aviad Ben Dov
2009-08-18 20:21:55
Note. Javac expects a FILENAME (hence the herb.java) and Java expects a CLASSNAME (hence herb). That difference bites most beginners.
Thorbjørn Ravn Andersen
2009-08-19 09:00:03
Not only that, `java` expects a fully qualified name and expects them to be in a directory structure based on the package structure, while javac can deal with files being anywhere.
Aviad Ben Dov
2009-08-19 17:36:30
+7
A:
I would suggest you read the appropriate sections in The Java Tutorial from Sun:
http://java.sun.com/docs/books/tutorial/getStarted/cupojava/win32.html
Thorbjørn Ravn Andersen
2009-08-18 20:26:47
A:
After compiling it you can jar it.
java -jar AppName.jar
http://windowstipoftheday.blogspot.com/2005/10/setting-jar-file-association.html
Avery
2009-08-18 20:35:34
This command (java -jar AppName.jar) does not jar it up, it executes something that has already been jarred as an executable jar file. In order to put a .class file into a jar, you would use the jar command; as in "jar -cf myjar.jar classes/*" In order to create a jar that can be executed with the java -jar command you need to specify the main class in the manifest file. This is all well beyond the scope of the original question, so if you want to know more, google "create executable jar".
digitaljoel
2009-08-18 21:12:32