Java面試題目！【原始碼分析設計模式 2
六、程式碼例項
1、UML類圖
2、程式碼架構
3、具體程式碼
（1）order包包
package com.guor.abstractFactory.order;
import com.guor.abstractFactory.pizza.Pizza;
//一個抽象工廠模式的抽象層(介面)
public interface AbsFactory {
//讓下面的工廠子類來 具體實現
public Pizza createPizza(String orderType);
}
package com.guor.abstractFactory.order;
import com.guor.abstractFactory.pizza.BJCheesePizza;
import com.guor.abstractFactory.pizza.BJPepperPizza;
import com.guor.abstractFactory.pizza.Pizza;
//這是工廠子類
public class BJFactory implements AbsFactory {
@Override public Pizza createPizza(String orderType) { System.out.println("~使用的是抽象工廠模式~"); Pizza pizza = null; if(orderType.equals("cheese")) { pizza = new BJCheesePizza(); } else if (orderType.equals("pepper")){ pizza = new BJPepperPizza(); } return pizza; }
}
package com.guor.abstractFactory.order; import com.guor.abstractFactory.pizza.LDCheesePizza; import com.guor.abstractFactory.pizza.LDPepperPizza; import com.guor.abstractFactory.pizza.Pizza; public class LDFactory implements AbsFactory { @Override public Pizza createPizza(String orderType) { System.out.println("~使用的是抽象工廠模式~"); Pizza pizza = null; if (orderType.equals("cheese")) { pizza = new LDCheesePizza(); } else if (orderType.equals("pepper")) { pizza = new LDPepperPizza(); } return pizza; } }
package com.guor.abstractFactory.order;
import com.guor.abstractFactory.pizza.Pizza;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class OrderPizza {
AbsFactory factory;
// 構造器
public OrderPizza(AbsFactory factory) {
setFactory(factory);
}
private void setFactory(AbsFactory factory) {
Pizza pizza = null;
String orderType = ""; // 使用者輸入
this.factory = factory;
do {
orderType = getType();
// factory 可能是北京的工廠子類，也可能是倫敦的工廠子類
pizza = factory.createPizza(orderType);
if (pizza != null) { // 訂購ok
pizza.prepare();
pizza.bake();
pizza.cut();
pizza.box();
} else {
System.out.println("訂購失敗");
break;
}
} while (true);
}
// 寫一個方法，可以獲取客戶希望訂購的披薩種類
private String getType() {
try {
BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
System.out.println("input pizza 種類:");
String str = strin.readLine();
return str;
} catch (IOException e) {
e.printStackTrace();
return "";
}
}
}
package com.guor.abstractFactory.order;
public class PizzaStore {
public static void main(String[] args) {
new OrderPizza(new BJFactory());
}
}
```
（2）pizza包包
```
package com.guor.abstractFactory.pizza;
public class BJCheesePizza extends Pizza {
@Override
public void prepare() {
setName("北京的乳酪pizza");
System.out.println("北京的乳酪pizza 準備原材料");
}
}
package com.guor.abstractFactory.pizza;
public class BJPepperPizza extends Pizza {
@Override
public void prepare() {
setName("北京的胡椒pizza");
System.out.println(" 北京的胡椒pizza 準備原材料");
}
}
package com.guor.abstractFactory.pizza;
public class LDCheesePizza extends Pizza{
@Override
public void prepare() {
setName("倫敦的乳酪pizza");
System.out.println(" 倫敦的乳酪pizza 準備原材料");
}
}
package com.guor.abstractFactory.pizza;
public class LDPepperPizza extends Pizza{
總結
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