package Strategy_Pattern;
/*
* head first 设计模式 完整代码练习
*
* 1.策略模式（封装算法，让算法之间可以相互代替。<好处：使得算法的变化独立于使用算法的客户。>）
*
*
* */
public abstract class Strategy_Pattern_Duck {
FlyBehaver flyBehaver;
EatDifference eatDifference;
// 习惯写空的构造方法
public Strategy_Pattern_Duck() {
};
// 用接口来实现具体的算法
public void flyPerform() {
flyBehaver.fly();
}
public void eatPerform() {
eatDifference.eat();
}
}
package Strategy_Pattern;
interface FlyBehaver {
// 飞行的方法
void fly();
}
class FlywhitB implements FlyBehaver {
@Override
public void fly() {
// TODO Auto-generated method stub
System.out.println("FlywhitB");
}
}
class FlywhitA implements FlyBehaver {
@Override
public void fly() {
// TODO Auto-generated method stub
System.out.println("FlywhitA ");
}
}
package Strategy_Pattern;
public interface EatDifference {
void eat();
}
class EatApple implements EatDifference {
@Override
public void eat() {
// TODO Auto-generated method stub
System.out.println("this is duck eatting Apple!");
}
}
class EatBanana implements EatDifference {
@Override
public void eat() {
// TODO Auto-generated method stub
System.out.println("this is duck eatting banana!");
}
}
package Strategy_Pattern;
public class WhiteDuck extends Strategy_Pattern_Duck {
public WhiteDuck() {
// 具体的whiteDuck有具体的eat和fly的方法
flyBehaver = new FlywhitB();
eatDifference = new EatApple();
}
public void sayHello() {
System.out.println("这是WhiteDuck！");
}
}
package Strategy_Pattern;
public class Test {
public static void main(String arg[]) {
Strategy_Pattern_Duck d = new WhiteDuck();
d.eatPerform();
d.flyPerform();
((WhiteDuck) d).sayHello();
}
}
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