Difference Between Pointer And Reference Pdf File

Difference between pointer and reference pdf file

Difference between pointer and reference pdf file

The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day.

Difference between pointer and reference pdf file

The content of your character is your choice. Day by day, what you do is who you become.

Difference between pointer and reference pdf file

Your integrity is your destiny - it is the light that guides your way. The GC will make a reference count for cleanup.

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If the count becomes 1 the object will be GC'd. The 1 reference will be that of the garbage collector. Originally posted by Adam Richards: In other languages, a Java "reference" might be called a pointer or address.

Difference between pointer and reference pdf file

Hope that clarifies rather than obfuscates! Originally posted by Ilja Preuss: The "new" operator creates a new object of the ClassA type on the heap and returns a reference to the object. The reference is then assigned to the obj variable. As obj is a local variable, it lives on the stack. Does that help? Originally posted by Stuart Ash: To add, the starting point to make the distinction is the lifetime-predictability of the variable reference.

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Since, for objects, the lifetime is unpredictable, they are always in the heap. For in-method variables primitives and references , like Ilja explains, the lifetime is predictable, and hence in the stack.

Difference between pointer and reference pdf file

For instance variables primitives and references , the lifetime is unpredictable, hence the heap. This holds for both references and primitives.

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I hope this properly summarizes the concept. Forum: Beginning Java. Vijay Raj. I am reading about garbage collection and I am really getting confused by therse two terms. When we say that an object is garbage collected, do we mean the memory allocated by new to obj is being garbage collected.

Is there any text that explains about the heap, stack frame pictorally or using an java code example.

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I am not able to make a picture of whats happening in the background. Ilja Preuss. The "new" operator creates a new object of the ClassA type on the heap and returns a reference to the object. Stuart Ash. Perhaps TIJ gives the best explanation for this.

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What happens to the memory space in the heap. Is this where garbage collection comes into the picture. It collects the garbage from the heap. Stuart Goss. It may help to think "garbage collectable heap" and not just "heap".

When there is no reference to this memory on the gc-heap, then the gc removes the memory the next time it decides to clean up.

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Pradeep Kadambar. All the references are stored on the stack. Hope I am not making things more complex. Did someone suggest otherwise?

If the reference is stored in an instance variable aka field , it's stored on the heap, obviously. Only local variables including parameters are stored on the stack.

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No, java garbage collectors don't use reference counts, but more sophisticated algorithms. With only reference counting, an object that is only referenced by unreachable objects wouldn't get garbage collected, leading to memory leaks due to reference circles.

Just imagine an object referencing itself.

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Adam Richards. In other languages, a Java "reference" might be called a pointer or address. Ken Blair. When the variable is not a primitive you mean. To add, the starting point to make the distinction is the lifetime-predictability of the variable reference. Any objections to this?

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The above sums it up fine? Sounds good to me. The reason that the lifetime place a vital role in deciding between heap and stack is that stack space gets allocated when entering a method, and deallocated when the method is left.

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That is, we need to exactly know how much space is needed while the method is executed, and the space is only available during the lifetime of the method.

Hi Stuart I was very confused about this concept and even was going through other threads in which this is discussed.

Difference between pointer and reference pdf file

But your concept of lifetime makes it clear for what is stored on heap and what is stored on stack. Thanks very much. That's what you're going with?

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I prefer this tiny ad:. Boost this thread! Singleton Class and Garbage collection. Will this cause a memory leak?