设计模式--策略模式

<!--设计模式之Strategy Pattern -行为型模式--策略模式>
// 定义了算法族，分别封装起来，让他们之间可以相互替换，此模式让算法的变化独立于使用算法的客户

Demo1---FACTORY METHOD
鸭子有飞行和鸣叫两种行为，而不同的鸭子，它的飞行行为和鸣叫行为各不相同，如何创建一个程序实现
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package model;

public abstract class Duck {
/**
* 飞行行为
*/
FlyBehavior flyBehavior;

/**
* 叫声行为
*/
QuackBehavior quackBehavior;

//抽象方法
public Duck(){

}

public void setFlyBehavior(FlyBehavior flyBehavior) {
this.flyBehavior = flyBehavior;
}

public void setQuackBehavior(QuackBehavior quackBehavior) {
this.quackBehavior = quackBehavior;
}

public abstract void display();

//委托给行为类
public void performFly(){
flyBehavior.fly();
}

//委托给行为类
public void performQuack(){
quackBehavior.quack();
}

public void swim(){
System.out.println("All ducks float,even decoys!");
}

}

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package model;

import dao.FlyWithSwing;

import dao.Quack;

public class MallarDuck extends Duck{

@Override
public void display() {
// TODO Auto-generated method stub
System.out.println("I'm real Mallard duck");
}

public MallarDuck(){
quackBehavior = new Quack();
flyBehavior = new FlyWithSwing();
}

}

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package model;

import dao.FlyNoWay;

import dao.Quack;

public class ModelDuck extends Duck{

@Override
public void display() {
// TODO Auto-generated method stub
System.out.println("I'm a model duck!!");
}

public ModelDuck(){
flyBehavior = new FlyNoWay();
quackBehavior = new Quack();
}

}

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package model;

public interface FlyBehavior {
public void fly();

}

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package model;

public interface QuackBehavior {
public void quack();

}

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package dao;

import model.FlyBehavior;

public class FlyNoWay implements FlyBehavior{

@Override
public void fly() {
// TODO Auto-generated method stub
System.out.println("I can't fly!!");
}

 

}

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package dao;

import model.FlyBehavior;

public class FlyRocketPowered implements FlyBehavior{

@Override
public void fly() {
// TODO Auto-generated method stub
System.out.println("I'm flying with a rocket!");
}

}

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package dao;

import model.FlyBehavior;

public class FlyWithSwing implements FlyBehavior {

@Override
public void fly() {
System.out.println("I'm flying！！");
}

}

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package dao;

import model.QuackBehavior;

public class MuteQuake implements QuackBehavior{

@Override
public void quack() {
// TODO Auto-generated method stub
System.out.println("silence");
}

}

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package dao;

import model.QuackBehavior;

public class Quack implements QuackBehavior {

@Override
public void quack() {
System.out.println("Quack");
}

}

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package dao;

import model.QuackBehavior;

public class Squake implements QuackBehavior{

@Override
public void quack() {
// TODO Auto-generated method stub
System.out.println("Squake");
}

}