1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/composition/src-api2.0-compat/api/Arithmetica.java Sat Jun 14 09:57:54 2008 +0200
1.3 @@ -0,0 +1,54 @@
1.4 +package api;
1.5 +
1.6 +/** Class to simplify arithmetical operations, improved version to compute
1.7 + * the sum for ranges, but only if one uses the new constructor to indicate
1.8 + * need for new version.
1.9 + *
1.10 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.11 + * @version 2.0
1.12 + */
1.13 +// BEGIN: design.composition.arith2.0.compat
1.14 +public class Arithmetica {
1.15 + private final int version;
1.16 +
1.17 + public Arithmetica() {
1.18 + this(1);
1.19 + }
1.20 + public Arithmetica(int version) {
1.21 + this.version = version;
1.22 + }
1.23 +
1.24 + public int sumTwo(int one, int second) {
1.25 + return one + second;
1.26 + }
1.27 +
1.28 + public int sumAll(int... numbers) {
1.29 + int sum = numbers[0];
1.30 + for (int i = 1; i < numbers.length; i++) {
1.31 + sum = sumTwo(sum, numbers[i]);
1.32 + }
1.33 + return sum;
1.34 + }
1.35 +
1.36 + public int sumRange(int from, int to) {
1.37 + switch (version) {
1.38 + case 1: return sumRange1(from, to);
1.39 + case 2: return sumRange2(from, to);
1.40 + default: throw new IllegalStateException();
1.41 + }
1.42 + }
1.43 +
1.44 + private int sumRange1(int from, int to) {
1.45 + int len = to - from;
1.46 + int[] array = new int[len + 1];
1.47 + for (int i = 0; i <= len; i++) {
1.48 + array[i] = from + i;
1.49 + }
1.50 + return sumAll(array);
1.51 + }
1.52 +
1.53 + private int sumRange2(int from, int to) {
1.54 + return (from + to) * (to - from + 1) / 2;
1.55 + }
1.56 +// END: design.composition.arith2.0.compat
1.57 +}