如何在执行期间查看Java程序中每个方法所花费的时间

Question

I am trying to find the time taken by each method that my Java program calls, while executing. I do not want to litter my code with System.currentTimeMillis() . Maybe, something like a profiler or an IDE plugin, but I am not sure if that is what it is called. Can someone help me by pointing me in the right direction?

Sample code :

public static void main(String[] args){
   Obj A = new Obj();
   ObjDiff B = new ObjDiff();
   A.callMe();
   B.callMeToo();
}

Tools/Frameworks :

• Eclipse
• Struts

What I Want :

1. Time taken to instantiate Obj A ,
2. Time taken to instantiate ObjDiff B ,
3. Time taken to run A.callMe() ,
4. Time taken to run B.callMeToo()

Any help will be greatly appreciated.

Cheers,
Rohitesh

EDIT :
I have installed VisualVM and used it as a standalone app. It has been helpful. However, my primary concern is still not addressed. I cannot look at the memory/CPU usage, method wise. Any thoughts on this?

Answer 1

I would recommend VisualVM too, basic but quite useful. Recommended you run it on the same Java 7 JVM as your app top avoid compatibility issues. If you need more advanced features like tracing a user interaction with a web server, you can look at more elaborate profilers like Introscope.

Answer 2

VisualVM is a good tool. My favortine one (by far) is JProfiler. It is not free and quite expensive if you're not a company but you can evaluate it for 10 days.