-rw-rw-r– 1 jialiang users 107 Jul 22 11:20 Bar.java
[jialiang@root java_debug_flag]$ javac -g:none Bar.java
[jialiang@root java_debug_flag]$ ls -ort
total 8
-rw-rw-r– 1 jialiang 107 Jul 22 11:20 Bar.java
-rw-rw-r– 1 jialiang 488 Jul 22 11:21 Bar.class
[jialiang@root java_debug_flag]$ javac -g:vars Bar.java
[jialiang@root java_debug_flag]$ ls -ort
total 8
-rw-rw-r– 1 jialiang 107 Jul 22 11:20 Bar.java
-rw-rw-r– 1 jialiang 591 Jul 22 11:22 Bar.class
[jialiang@root java_debug_flag]$ javac -g:vars,lines Bar.java
[jialiang@root java_debug_flag]$ ls -ort
total 8
-rw-rw-r– 1 jialiang 107 Jul 22 11:20 Bar.java
-rw-rw-r– 1 jialiang 629 Jul 22 11:22 Bar.class
[jialiang@root java_debug_flag]$ javac -g:vars,lines,sources Bar.java
[jialiang@root java_debug_flag]$ ls -ort
total 8
-rw-rw-r– 1 jialiang 107 Jul 22 11:20 Bar.java
-rw-rw-r– 1 jialiang 629 Jul 22 11:22 Bar.class
从上面的例子可以看出，没有debug信息的class文件和所有debug信息class文件的增量比是：(629-488)/488=28%
PS：在eclipse中如果开启-g:vars,lines,source
