12.1 Array-Based Data Structures
“Well, I’ll eat it,” said Alice, “and if it makes me grow larger, I can reach the key; and if it makes me grow smaller, I can creep under the door; so either way I'll get into the garden.”
—LEWIS CARROLL, Alice’s Adventures in Wonderland
In Java, you can read the length of an array as data when the program is running, but once your program creates an array of that length, it cannot change the length of the array. For example, suppose you write a program to record customer orders for a mail-order house, and suppose you store all the items ordered by one customer in an array order of objects of a class called OrderItem. You could ask the user for the number of items in an order, store the number in a variable called ...
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