Java what kind of variables are placed in the heap

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August 23, at pm. Upir says:. February 17, at am. Pieter says:. January 12, at pm. Prabhath says:. January 4, at am. Vel says:. December 16, at am. Sudhakar says:. Also one good reason why method members shall be on stack is that if they would not than the method could not be recursively called. First, method variables are called local variables. The 3 things: variable model generated object reference to that object, stored in a variable are quite different, do not mess them up.

Alexei Kaigorodov Alexei Kaigorodov I think I have told the same thing which you are telling. Also, there is only 2 thing one is reference and one is actual space created for object. So, your 3 points is actually 2 I think, "variable model" is same as "reference to that object, stored in a variable".

Jayesh Nope. References may be stored in different variables, or in no one. Variables may contain different values, — Alexei Kaigorodov.

Jayesh same variable may contain different values in different moments of time. Do you think that a handbag is the same as things in it?

You are right but as the discussion was going on memory part, I think generated object in heap is where you handbag is and values inside it will be at same place where handbag is created, so that they can store it, so "generated object" and "reference to that object, stored in a variable" will be at same place always, am I correct?

Jayesh No, not always. Reference can be in a stack frame, as in my code example. And anyway, "at the same place" does not mean "the same". If you store my phone number in your phone's memory, will your phone and my phone number be the same? Object are stored in the Heap. The object reference stored in the stack. Static variable stored in the method area. Prerequisite: Memory layout of C program. Java variable placed on stack or heap Asked ago.

Active 3 hr before. Viewed times. Let's consider. I can't define type to set an array of objects in a variable React. Botpress - Custom Component access to session variable React function calling and accessing variables Environmental variables are undefined in react Create React App. I don't know if that made it into the spec, or, even if it did, if any implementations take advantage of it. So for now, it's safe to say that all objects are always on the heap, and only local variables are on the stack.

Dattatraya Tembare. Dear All, Here one important thing has missed, it will clear all doubts. Hope these will clear the picture.

Already covered. Not missed. I'm not sure why you'd think the picture wasn't clear already. Youtube Video. In method code, only if you create any object then it will go in heap else all local variables will go in stack. What Campbell stated was correct. All the executable code for method bodies goes on the heap.

It's only local variables that go on the stack. It seems to suggest that a method's executable code goes on the stack, which is false. If that's not what it's trying to say, it should be clearer in how it's worded. It also talks about stack variables being "flushed", as if there's some active process to remove or clear them. That's not how it works. The stack pointer simply gets reset to its previous value. The old values of the variables are still there on the stack until another stack frame overwrites them.

False, what Campbell stated was correct. In a method code, we not only create objects but we also create local variables, so we can't say that whole method code will go on heap,i think so. It doesn't matter what we create. There's no reason that the executable code has to live in the same region of memory as the data it refers to.

The executable code exists exactly once for each method, and it goes in the method area which is part of the heap. Executable code never goes on the stack.