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策略模式
分别封装行为接口，实现算法族，超类里放行为接口对象，在子类里具体设定行为对象。
原则就是：分离变化部分，封装接口，基于接口编程各种功能。
此模式让行为算法的变化独立于算法的使用者。
类结构图：
示例代码：
package com.flybehavior;
public interface FlyBehavior {
void fly();
}
package com.flybehavior;
public class BadFlyBehavior implements FlyBehavior {
@Override
public void fly() {
// TODO Auto-generated method stub
System.out.println("--Bad Fly--");
}
}
package com.flybehavior;
public class GoodFlyBehavior implements FlyBehavior {
@Override
public void fly() {
// TODO Auto-generated method stub
System.out.println("--Good FlyBehavior--");
}
}
package com.flybehavior;
public class NoFlyBehavior implements FlyBehavior {
@Override
public void fly() {
// TODO Auto-generated method stub
System.out.println("--No FlyBehavior--");
}
}
package com.quackbehavior;
public interface QuackBehavior {
void quack();
}
package com.quackbehavior;
public class GaGaQuackBehavior implements QuackBehavior {
@Override
public void quack() {
// TODO Auto-generated method stub
System.out.println("--GaGa--");
}
}
package com.quackbehavior;
public class GeGeQuackBehavior implements QuackBehavior {
@Override
public void quack() {
// TODO Auto-generated method stub
System.out.println("--Ge Ge--");
}
}
package com.quackbehavior;
public class NoQuackBehavior implements QuackBehavior {
@Override
public void quack() {
// TODO Auto-generated method stub
System.out.println("--No Quack--");
}
}
package com.duck;
import com.flybehavior.FlyBehavior;
import com.quackbehavior.QuackBehavior;
public abstract class Duck {
FlyBehavior mFlyBehavior;
QuackBehavior mQuackBehavior;
public Duck() {
}
public void Fly() {
mFlyBehavior.fly();
}
public void Quack() {
mQuackBehavior.quack();
}
public abstract void display();
public void setmFlyBehavior(FlyBehavior mFlyBehavior) {
this.mFlyBehavior = mFlyBehavior;
}
public void setmQuackBehavior(QuackBehavior mQuackBehavior) {
this.mQuackBehavior = mQuackBehavior;
}
public void swim() {
System.out.println("--I‘m swimming--");
}
}
package com.duck;
import com.flybehavior.GoodFlyBehavior;
import com.quackbehavior.GaGaQuackBehavior;
public class GreenHeadDuck extends Duck {
public GreenHeadDuck() {
mFlyBehavior = new GoodFlyBehavior();
mQuackBehavior = new GaGaQuackBehavior();
}
@Override
public void display() {
// TODO Auto-generated method stub
System.out.println("--RedHeadDuck--");
}
}
package com.duck;
import com.flybehavior.BadFlyBehavior;
import com.quackbehavior.GeGeQuackBehavior;
public class RedHeadDuck extends Duck {
public RedHeadDuck() {
mFlyBehavior = new BadFlyBehavior();
mQuackBehavior = new GeGeQuackBehavior();
}
@Override
public void display() {
// TODO Auto-generated method stub
System.out.println("--RedHeadDuck--");
}
}
package com.duck;
import com.flybehavior.NoFlyBehavior;
import com.quackbehavior.NoQuackBehavior;
public class StimulateDuck {
public static void main(String[] args) {
Duck mGreenHeadDuck = new GreenHeadDuck();
Duck mRedHeadDuck = new RedHeadDuck();
System.out.println("******GreenHeadDuck******");
mGreenHeadDuck.display();
mGreenHeadDuck.Fly();
mGreenHeadDuck.Quack();
mGreenHeadDuck.swim();
System.out.println("******RedHeadDuck******");
mRedHeadDuck.display();
mRedHeadDuck.Fly();
mRedHeadDuck.Quack();
mRedHeadDuck.swim();
System.out.println("******after change******");
mRedHeadDuck.setmFlyBehavior(new NoFlyBehavior());
mRedHeadDuck.Fly();
mRedHeadDuck.setmQuackBehavior(new NoQuackBehavior());
mRedHeadDuck.Quack();
}
}
输出
******GreenHeadDuck****** --RedHeadDuck-- --Good FlyBehavior-- --GaGa-- --I‘m swimming-- ******RedHeadDuck****** --RedHeadDuck-- --Bad Fly-- --Ge Ge-- --I‘m swimming-- ******after change****** --No FlyBehavior-- --No Quack--
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原文地址：http://www.cnblogs.com/chengzi123/p/4781903.html
