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07_[자바] 객체와 heap

Where is the data for an object and how is the lifetime of the object controlled? C++ takes the approach that control of efficiency is the most important issue, so it gives the programmer a choice. For maximum runtime speed, the storage and lifetime can be determined while the program is being written, by placing the objects on the stack (these are sometimes called automatic or scoped variables) or in the static storage area. This places a priority on the speed of storage allocation and release, and this control can be very valuable in some situations.

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The second approach is to create objects dynamically in a pool of memory called the heap. In this approach, you don’t know until run time how many objects you need, what their lifetime is, or what their exact type is. Those are determined at the spur of the moment while the program is running. If you need a new object, you simply make it on the heap at the point that you need it.

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Java uses dynamic memory allocation, exclusively. Every time you want to create an object, you use the new operator to build a dynamic instance of that object.

 

[Thinking in Java]

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