Java, A Beginner's Guide, 5th Edition, 5th Edition

Try This 5-2 A Queue Class

QDemo.java

As you may know, a data structure is a means of organizing data. The simplest data structure is the array, which is a linear list that supports random access to its elements. Arrays are often used as the underpinning for more sophisticated data structures, such as stacks and queues. A stack is a list in which elements can be accessed in first-in, last-out (FILO) order only. A queue is a list in which elements can be accessed in first-in, first-out (FIFO) order only. Thus, a stack is like a stack of plates on a table—the first down is the last to be used. A queue is like a line at a bank—the first in line is the first served.

What makes data structures such as stacks and queues interesting is that they combine ...