Runtime - why is freeMemory() not showing memory consumed correctly?

Question

Below is the code snippet to examine the memory

public class TestFreeMemory {

    public static void main(String ... args){

        Runtime rt = Runtime.g         


        

Answer 1

It's a good question since you are expecting an INCREASE in memory usage to be reflected it seems a logical test. You can assume this behaviour is because the Heap management and garbage collection system is somewhat more complex that a simple Free vs Allocated boundary. Allocation is probably done in chunks much bigger than your one String + one Integer and so free memory is likely to be counted by summing up free chunks.