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Suppose that you want to adjust your way of calculating movie ratings by introducing weights. You could insert those weights into the movie-rating method directly:
public class Movie {
// Define movieRating:
public static int movieRating (int s, int a, int d) {
return 6 * s + 13 * a + 11 * d;
}
}
Such direct insertion is not a good idea, however. Sprinkling numbers throughout a program creates problems, as a program grows, because you easily can forget where such numbers are located.
A safer approach is to use variables. You cannot use local variables, however, because local variables exist only during the execution of their corresponding blocks.