http://ant.apache.org/manual/tutorial-HelloWorldWithAnt.html#enhance 중
Enhance the build file
빌드파일 향상시키기
Now we have a working buildfile we could do some enhancements: many time you are referencing the same directories, main-class and jar-name are hard coded, and while invocation you have to remember the right order of build steps.
이제 작동하는 빌드파일이
