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I learned that class fields are stored in the heap, but where are methods stored? In the heap or somewhere else? are they inline?
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Static information (interface & class boxes) and instance information (object boxes) are stored in the heap. Method information is stored in the run-time stack.
Methods and variables(inside methods) are stored in the stack. Objects and Instance variables are stored inside the heap. When an object is called inside a stack method it has a pointer to the heap object.
The "Method" "Lives" in the code space. It is not on the stack or the heap. An object is created on the heap that has a pointer for each of its methods. That object lives in the heap, but the methods it points to are in code.
Methods are stored somewhere else in the memory. Notice that methods are per-class, not per-instance. So typically, the number of methods doesn't change over the run-time of a program (there are exceptions). In traditional models, the place where the methods live is called the "code segment". In .net, it's more difficult: the methods originally live in the assembly, and get mapped into the process memory. There, the just-in-time compiler creates a second copy of some methods in native code; this copy gets executed. The JIT code may get created and deleted several times during the runtime, so it is practical to view it also as living "in Heap".
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Class methods are stored together with all code in a dedicated segment of program memory meant specifically for storing code. Each method's code is stored once.
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