A PriorityQueue is a list that always keeps its items sorted based on some rule, like smallest to largest. So, when you take an item out, you always get the one with the highest (or lowest) priority.

There are two pools of memory that are available to you as a C++ programmer: the stack and the heap. Until now, we’ve been using the stack. This video (9:30) explains the difference between the stack ...

Stack and heap memory must be allocated statically by the programmer but calculating the space required is notoriously difficult for all but the smallest embedded systems.

When you create a new object in Java,aClass a = new aClass();memory is dynamically allocated on the process's heap to store the object instance. A reference to this object is created on the stack ...