Java Reference
In-Depth Information
} else {
return NORTH;
}
}
}
Now that we have our completed enumeration, we need a test program to see how it works. Listing
3-17 shows a program class that does the job.
Listing 3-17. A test class for our enumeration
package com.bryantcs.examples.enumExample;
public class EnumExample {
public static void main(String[] args) {
int[] compassPoints = {22, 77, 144, 288};
for (int i = 0; i < compassPoints.length; i++) {
System.out.println(compassPoints[i] + " degrees is (very roughly) "
+ Direction.findCardinalDirection(compassPoints[i]));
}
for (Direction d : Direction.values()) {
System.out.println(d + " is " + d.getDegrees() + " degrees.");
}
}
}
EnumExample
produces the output in the console shown in Listing 3-18.
Listing 3-18. EnumExample output
22 degrees is (very roughly) NORTH
77 degrees is (very roughly) EAST
144 degrees is (very roughly) SOUTH
288 degrees is (very roughly) WEST
NORTH is 0 degrees.
EAST is 90 degrees.
SOUTH is 180 degrees.
WEST is 270 degrees.
Summary
In this chapter, we learned the basics about the various data types that are available in Java. We found
out:
•
The size restrictions of the various numeric data types
•
How the
boolean
data type works
How
char
variables and
String
objects work and a bit about how they can interact
•
