When a program written in Java is running, will all of its classes be all loaded into the main memory? If so, isn’t it a waste of RAM?
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When a program written in Java is running, will all of its classes be all loaded into the main memory? If so, isn’t it a waste of RAM?
No it’s fine, because of virtual address space and virtual memory. Read these:
http://en.wikipedia.org/wiki/Virtual_memory
http://en.wikipedia.org/wiki/Virtual_address_space
Virtual memory means that you can load a large amount into memory and the unused sections are saved to disc and are moved out of physical RAM.
Virtual address space means that each process (one example of a process is your Java program) has its own address space, so it does not ‘steal’ addresses from other processes.