스트래티지 패턴 예제
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//Strategy Pattern 스트래티지 패턴 예제
interface QuackBehavior { public void quack();
} // 공통 기능을 정의하는 인터페이스 (오리는 공통적으로 꽥꽥 거리는 행동을 한다)
/////////////////// Quack class ///////////////////
class Quack implements QuackBehavior { public void quack(){ System.out.println("꽥!"); } } // 인터페이스를 상속 받아서 꽥꽥 이라는 기능을 정의한다. (오버라이딩)
///////////////// MuteQuack class ////////////////////
class MuteQuack implements QuackBehavior { public void quack(){ System.out.println("조용!"); } }
//
//////////////////////////////////////////////////////////////
class RubberQuack implements QuackBehavior { public void quack(){ System.out.println("러버 꽥!!"); } }
//////////////////////////////////////////////////////////////
class RubberFlyBehavior implements FlyBehavior{
public void fly(){
System.out.println("러버~!");
}
}
//////////////////////////////////////////////////////////////
interface FlyBehavior { public void fly(); }
//////////////////////////////////////////////////////////////
class FlyWithMings implements FlyBehavior{
public void fly(){
System.out.println("날아간다~~!");
} }
//////////////////////////////////////////////////////////////
class FlyNoWay implements FlyBehavior{
public void fly(){
System.out.println("꼼짝~!");
}
}
//////////////////////////////////////////////////////////////
class Duck{
FlyBehavior fb; QuackBehavior qb;
public void performQuack(){
qb.quack();
}
public void performFly(){ fb.fly(); }
public void shotByGun(){ qb = new MuteQuack(); fb = new FlyNoWay(); }
void setFlyBehavior(FlyBehavior fb){
this. fb = fb;
}
}
//////////////////////////////////////////////////////////////
class MallardDuck extends Duck { MallardDuck(){ qb = new Quack(); fb = new FlyWithMings(); }; }
//////////////////////////////////////////////////////////////
class DecoyDuck extends Duck{
DecoyDuck(){
qb = new MuteQuack(); fb = new FlyNoWay(); }
}
//////////////////////////////////////////////////////////////
class RubberDuck extends Duck{
RubberDuck(){
qb = new RubberQuack(); fb = new RubberFlyBehavior(); }
}
//////////////////////////////////////////////////////////////
class FlyRocketPowered implements FlyBehavior {
public void fly(){ System.out.println("날아간다 슈웅~~!!!"); } }
class MiniDuckSimulator { public static void main(String[] args) {
Duck d[] = new Duck[10];
for(int i=0; i<10; i++){
int x = (int)(Math.random()*10);
if(x%3==0){
d[i]=new MallardDuck();
}else if(x%3==1){ d[i]=new DecoyDuck(); }else{ d[i]=new RubberDuck(); } /* Duck m = new MallardDuck(); Duck d = new DecoyDuck(); Duck r = new RubberDuck();
m.performQuack(); m.performFly();
d.performQuack(); d.performFly();
r.performQuack(); r.performFly(); */ }
d[3].shotByGun(); d[5].shotByGun(); d[9].shotByGun();
for(int j=0; j<10; j++){ System.out.println((j+1)+" 번째 오리가 꽥꽥거린다"); d[j].performQuack();}
System.out.println("\n");
for(int j=0; j<10; j++){ System.out.println((j+1)+" 번째 오리가 날아다닌다");
d[j].performFly();}
Duck r = new RubberDuck(); r.setFlyBehavior(new FlyRocketPowered()); System.out.println("\n"); r.performQuack(); r.performFly();
} }
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