Visualization of the Java classes [closed]

Question

I'm very new to programming and I have the following question.

I have a class:

class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); // Display the string.
    }
}

I wish I could see the heaps, threads (internally & externally) that this program used etc.

Are there any tools for it?

Answer 1

Use a debugger, like integrated in Netbeans or Eclipse.

aslo this profiler might be helpful, but it is very advanced.

http://visualvm.java.net/ which is integrated in any recent jvm. But you cannot really see which Thread THIS particular code runs in.

Answer 2

Look at following links:

Java VisualVM

IBM HeapAnalyzer

How can I see what is in my heap in Java?

Viewing live heap in Eclipse