lect10c
lists, cont

A way of keeping track of a whole bunch of data.

Task:

declare a variable to hold a list of Doubles.
initialize it, so that it holds (a reference to) an empty list.
Write a loop to add(insert) the numbers 10,20,30,40,...,1000.
(What's our index variable? Hmmm, what's our accumulator variable?)
Write a loop to add(insert) the numbers from the keyboard.
we'll write a method which is given a list of Doubles, and it finds the maximum of all the contents. (What is the signature for this method?)

Handy tip: here's a method which will create a list for you, which instead of being initially empty, it initally holds whatever arguments you pass in ¹: java.util.Arrays.asList(3.3, 4.4, 5.5)

¹Note that if you pass in Doubles, you'll get an List<Double>. If you pass in (say) booleans, they'll get auto-boxed into their wrapper class Booleans and asList will create a List<Boolean>. All good and fair. But what if we pass in zero input, as in Arrays.asList() -- what type of list to we get back? Uh-oh! Try it. ↩

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©2008, Ian Barland, Radford University
Last modified 2008.Nov.10 (Mon) Please mail any suggestions
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lect10clists, cont

lect10c
lists, cont