class Fruit{}
class Apple extends Fruit{}
class Banana extends Fruit{}
class Orange extends Fruit{}
class FruitFactory{
public static Fruit produceFruit(String name){
if("香蕉".equals(name)){
return new Banana();
}
if("蘋果".equals(name)){
return new Apple();
}
if("橘子".equals(name)){
return new Orange();
}
return null;
}
}
class Test{
public static void main(String[] args){
Apple a = FruitFactory.produceFruit("蘋果");
System.out.println(a);
}
}
總結
以上是不完善的工廠模式,如果子類有20個,可以寫到你砸鍵盤
工廠設計模式是爲了將new對象的過程獨立出來,這樣就不會存在亂new對象的問題了
2.代理設計模式
interface NET{
void connection();
}
class RealCon implements NET{
public void connection(){
System.out.println("連接成功");
}
}
class ProxyCon implements NET{
public static void railData(String username,String password){
if("admin".equals(username)){
if("admin".equals(password)){
System.out.println("驗證成功");
connection();
}
}
}
public void connection(){
new RealCon().connection();
}
}