策略模式

[color=red]【策略模式】定义一系列算法，把他们一个个封装起来，并且使它们可相互替换。本模式使得算法可独立于使用它的客户而变化[/color]

package com.demo.strategy;

import java.util.Arrays;

public class StrategyThree implements ComputableStrategy {

	@Override
	public double computableScore(double[] a) {
		// TODO Auto-generated method stub
		if(a.length<=2)
			return 0;
		double sum=0;
		Arrays.sort(a);
		for(int i=1;i<a.length-1;i++){
			sum=sum+a[i];
		}
		return sum/(a.length-2);
	}
}

package com.demo.strategy;

public class Application {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		double a[]={9.12,9.15,8.87,9.99,7.96,7.38};
		double b[]={8.72,8.95,9.87,8.99,8.26,8.38};
		//上下文对象
		GymnasticsGame game=new GymnasticsGame();
		//上下文对象使用统一策略
		game.setStrategy(new StrategyOne());
		System.out.println(game.getPersonScore(a));
		System.out.println(game.getPersonScore(b));
		System.out.println("-----------------");
		game.setStrategy(new StrategyTwo());
		System.out.println(game.getPersonScore(a));
		System.out.println(game.getPersonScore(b));
		System.out.println("-----------------");
		game.setStrategy(new StrategyThree());
		System.out.println(game.getPersonScore(a));
		System.out.println(game.getPersonScore(b));
	}
}

8.745000000000001
8.861666666666666
-----------------
8.702534326503933
8.84653917642559
-----------------
8.774999999999999
8.76