java 策略枚举

<pre name="code" class="java">

public enum PayrollDay {
	MONDAY,	TUESDAY,WEDNESDAY,THURSDAY,FRIDAY,SATURDAY,SUNDAY;
	private static final int HOURS_PER_SHIFT=8;
	
	double pay(double hoursWorked,double payRate){
		double basePay = hoursWorked * payRate;
		
		double overtimePay;
		
		switch (this) {
		case SATURDAY: case SUNDAY:
			overtimePay =hoursWorked* payRate/2;
		default:
			overtimePay = hoursWorked <=HOURS_PER_SHIFT? 0 :(hoursWorked - HOURS_PER_SHIFT)*payRate/2;
			break;
		}
		return basePay+ overtimePay;
	}
}


enum PayrollDay2 {
	MONDAY(PayType.WEEKDAY),
	TUESDAY(PayType.WEEKDAY),
	WEDNESDAY(PayType.WEEKDAY),
	THURSDAY(PayType.WEEKDAY),
	FRIDAY(PayType.WEEKDAY),
	SATURDAY(PayType.WEEKEND),
	SUNDAY(PayType.WEEKEND);
	
	private final PayType payType;

	private PayrollDay2(PayType payType) {
		this.payType=payType;
	}
	
	double pay(double hoursWorked,double payRate){
		return payType.pay(hoursWorked, payRate);
	}
	
	private enum PayType{
		WEEKDAY{
			double overtimePay(double hours,double payRate){
				return hours<=HOURS_PER_SHIFT?0:(hours-HOURS_PER_SHIFT)*payRate/2;
			}
		},
		WEEKEND{
			double overtimePay(double hours,double payRate){
				return hours*payRate/2;
			}
		};
		
		private static final int HOURS_PER_SHIFT=8;
		
		abstract double overtimePay(double hrs,double payRate);
		
		double pay(double hoursWorked,double payRate){
			double basePay=hoursWorked*payRate;
			return basePay+overtimePay(hoursWorked, payRate);
		}
	}
}




                
枚举策略模式(Strategy Pattern)是行为设计模式的一种,它允许你定义一系列算法,并将每个算法封装在独立的类中,然后将它们作为参数传递给一个共同的接口或抽象类。在Java中,枚举类型非常适合用来实现策略模式,因为枚举可以提供有限且预定义的选项。 Java枚举策略模式的实现通常包括以下几个步骤: 1. **接口或抽象类**:定义一个策略接口或抽象类,包含具体执行操作的方法。例如: ```java public interface PaymentStrategy { void processPayment(double amount); } ``` 2. **枚举类**:为每种策略创建一个枚举类,继承自策略接口或实现抽象类,并实现具体方法。比如: ```java public enum PaymentMethod implements PaymentStrategy { CASH("Cash", amount -> System.out.println("Processing cash payment...")), DEBIT_CARD("Debit Card", amount -> System.out.println("Processing debit card payment...")); private String name; private Function<Double, Void> processPayment; PaymentMethod(String name, Function<Double, Void> processPayment) { this.name = name; this.processPayment = processPayment; } @Override public void processPayment(double amount) { processPayment.apply(amount); } public String getName() { return name; } } ``` 3. **客户端使用**:在需要使用策略的地方,可以创建枚举类型的实例并调用其方法: ```java public class PaymentProcessor { private PaymentStrategy strategy; public void setPaymentStrategy(PaymentStrategy strategy) { this.strategy = strategy; } public void processPayment(double amount) { strategy.processPayment(amount); } } PaymentProcessor processor = new PaymentProcessor(); processor.setPaymentStrategy(PaymentMethod.CASH); processor.processPayment(100.0); ```
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