I've been wondering what the exact meaning of Runtime.getRuntime().totalMemory(), Runtime.getRuntime().freeMemory(), and Runtime.getRuntime().maxMemory() is.
My understanding is, Runtime.getRuntime().totalMemory() returns the total memory my process is using. Is that correct?
How about freeMemory() and maxMemory()?
You can see the results in MB format, with the division of 1024 x 1024 which is equal to 1 MB.
int dataSize = 1024 * 1024;
System.out.println("Used Memory : " + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory())/dataSize + " MB");
System.out.println("Free Memory : " + Runtime.getRuntime().freeMemory()/dataSize + " MB");
System.out.println("Total Memory : " + Runtime.getRuntime().totalMemory()/dataSize + " MB");
System.out.println("Max Memory : " + Runtime.getRuntime().maxMemory()/dataSize + " MB");