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POCS type explanation needed on how heap and the stack work interms of reference variables and primitive variables in java for a non-CS guy
 

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  1. POCS type explanation needed on how heap and the stack work interms of reference variables and primitive variables in java for a non-CS guy
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    <p>I need a CS kind of explanation on how the following 2 methods work differently from each other. I do not have a CS background (studied accounting .. blaahh) so please elaborate where you think is necessary. So java is a pass by value language from what I've read.</p> <p>Consider the below primitive method. What exactly is it going to do in the background? The bit equivalence of lets say <code>int myvar =7;</code> will be made a copy of and passed into the method? How, please elaborate?</p> <pre><code>public void changePrim(int var){ var = 100; System.out.println("in change prim:"+ var); } </code></pre> <p>Next, the below method is going to have a variable passed into it that will be of type Person.</p> <pre><code>public void changePersonObject(Person p) { p.setAge(100); p.setFirstName("Lost"); p.setLastName("Boy"); // p = new Person("Lost", "Boy", 24, 100); // this creates new. why? } </code></pre> <p>So the first primitive argument method didn't change the int variable that was passed in to it from the client. Why does the second butcher the Person object's first and last name? Please elaborate with some emphasis in Computer Science. I'm learning that in parallel along with how java works. So bits and bytes would be deliciously devoured. Thank you. </p>
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    1. COI'm not going to write an article explaining how stacks work, but the basic answer to what you're getting at is that Java passes values to methods, and those values show up as local variables inside the methods. If the value is a reference to an object, replacing the local variable (`p = new Person();`) won't affect the object passed in, but *using* the reference value to locate an object and change it will change the same object that the calling code is looking at.
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    2. CONo this is not a duplicate. i need explanation in CS. I need the bits and bytes. What and how is something going on the stack and heap!
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    3. COMaybe this [Stack Overflow Convo](http://stackoverflow.com/questions/19623563/where-does-java-reference-variable-stored) will get you a little bit closer.
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