40 lines
1020 B
Java
40 lines
1020 B
Java
//: patterns/strategy/StrategyPattern2.java
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// ©2015 MindView LLC: see Copyright.txt
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package patterns.strategy;
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import java.util.function.*;
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import static com.mindviewinc.util.PrintArray.*;
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// "Context" is now incorporated:
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class FindMinima2 {
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Function<double[], double[]> algorithm;
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FindMinima2() { leastSquares(); } // default
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// The various strategies:
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void leastSquares() {
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algorithm = (line) -> new double[] { 1.1, 2.2 };
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}
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void perturbation() {
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algorithm = (line) -> new double[] { 3.3, 4.4 };
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}
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void bisection() {
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algorithm = (line) -> new double[] { 5.5, 6.6 };
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}
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double[] minima(double[] line) {
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return algorithm.apply(line);
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}
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}
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public class StrategyPattern2 {
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public static void main(String args[]) {
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FindMinima2 solver = new FindMinima2();
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double[] line = {
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1.0, 2.0, 1.0, 2.0, -1.0,
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3.0, 4.0, 5.0, 4.0 };
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printArray(solver.minima(line));
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solver.bisection();
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printArray(solver.minima(line));
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}
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} /* Output:
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1.1, 2.2
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5.5, 6.6
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*///:~
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