1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/samples/composition/src-api2.0-enum/api/Arithmetica.java Sat Jun 14 09:58:03 2008 +0200
1.3 @@ -0,0 +1,59 @@
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.enum
1.14 +public class Arithmetica {
1.15 + private final Version version;
1.16 + public enum Version { VERSION_1_0, VERSION_2_0 }
1.17 +
1.18 + public Arithmetica() {
1.19 + this(Version.VERSION_1_0);
1.20 + }
1.21 + public Arithmetica(Version version) {
1.22 + this.version = version;
1.23 + }
1.24 +
1.25 + public int sumRange(int from, int to) {
1.26 + switch (version) {
1.27 + case VERSION_1_0:
1.28 + return sumRange1(from, to);
1.29 + case VERSION_2_0:
1.30 + return sumRange2(from, to);
1.31 + default:
1.32 + throw new IllegalStateException();
1.33 + }
1.34 + }
1.35 +// END: design.composition.arith2.0.enum
1.36 +
1.37 + public int sumTwo(int one, int second) {
1.38 + return one + second;
1.39 + }
1.40 +
1.41 + public int sumAll(int... numbers) {
1.42 + int sum = numbers[0];
1.43 + for (int i = 1; i < numbers.length; i++) {
1.44 + sum = sumTwo(sum, numbers[i]);
1.45 + }
1.46 + return sum;
1.47 + }
1.48 +
1.49 +
1.50 + private int sumRange1(int from, int to) {
1.51 + int len = to - from;
1.52 + int[] array = new int[len + 1];
1.53 + for (int i = 0; i <= len; i++) {
1.54 + array[i] = from + i;
1.55 + }
1.56 + return sumAll(array);
1.57 + }
1.58 +
1.59 + private int sumRange2(int from, int to) {
1.60 + return (from + to) * (to - from + 1) / 2;
1.61 + }
1.62 +}