CSIS 110 – Lecture 36
Chapter 8 - Arrays
Reading: 8.1 to 8.2.3 (pages 381 – 389)
8.4 to 8.6 (pages 396 – 417)
Arrays and Methods
Assigning values to array elements in methods
Last time we looked what happens when you modify the values of array elements inside
of a method. We saw that because an array is a reference type, changes to the values of
the array elements affect the original array.
Let's look at ArrayCount.java
Let's look at ArrayCopy.java again.
[Draw pix]
Command Line Parameters
We've seen this since the first week of class: public static void main( String[] args )
String[] args is an array of Strings that is passed to the main method when you start a
program. The Strings are set to the command line parameters. For example:
java MyProgram one two three
java MyProgram hello world
java MyProgram junk "stuff things" objects
Look at MyProgram.java. Make sure to show a quoted string as a command line
parameter.
Look at Roots2. java
Returning an array from a method
We can pass arrays to methods as parameters. A method's return type can also be an array
type.
[public] [static] <returnType> <name> ( <parameterList> )
We've seen returnTypes such as int, float, boolean, double, void, Point, String,...
How about int[], double[], Point[], ...
