The heap is where Java objects are stored. Sometimes it is called the garbage collectible heap because this is the only area in which the garbage collector runs, ensuring that there is as much free memory as possible.
Base 16 numbering system in which 0-9 and A-F represent the numbers 0 through 15. Java hexadecimals are prefixed with 0x. Note that the letters used to represent a hexadecimal number are not case sensitive—that is, 0xAFC is identical to 0xafc.