Magic Literals

NOTE: This page / space is still a work in progress.

Magic numbers:

Any numbers apart from 0, -1, 1 should be in a (clearly named) constant local or global constant (constants are marked with the final keyword).

Magic Numbers: Good Style

public class Circle {

	public static final double NUM_COLS = 10;
	public static double printStars() {
		for (int i = 0; i < NUM_ROWS; i++) {
			System.out.print("*");
		}
	}
}

Magic Numbers: Bad Style

public class Circle {
	public static double printStars() {
		for (int i = 0; i < 10; i++) {
			System.out.print("*");
		}
	}
}