StrategyPatternWikiOne.java

import java.util.function.Function;

public class StrategyPatternTest {

public static void main(String[] args) {
	
	Function<Double, Double> normalStrategy =  (Double d) -> d;
	Function<Double, Double> happyHourStrategy =  (Double d) -> d * 0.5;
		
	Customer firstCustomer = new Customer(normalStrategy);

	// Normal billing
	firstCustomer.add(1.0, 1);

	// Start Happy Hour
	firstCustomer.setStrategy(happyHourStrategy);
	firstCustomer.add(1.0, 2);

	// New Customer
	Customer secondCustomer = new Customer(happyHourStrategy);
	secondCustomer.add(0.8, 1);
	// The Customer pays
	firstCustomer.printBill();

	// End Happy Hour
	secondCustomer.setStrategy(normalStrategy);
	secondCustomer.add(1.3, 2);
	secondCustomer.add(2.5, 1);
	secondCustomer.printBill();
		
	}
}