概念
結構
代碼
package design.simplefactory;
public class FruitFactory {
/**
* get方法, 獲得所有產品對象
*/
public static Fruit getFruit(String type) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
// if ("apple".equalsIgnoreCase(type)) {
// return Apple.class.newInstance();
// } else if ("banana".equalsIgnoreCase(type)) {
// return Banana.class.newInstance();
// } else {
// System.err.println("找不到相應的實例化類");
// }
// return null;
// 改進
Class<?> fruit = Class.forName(type);
return (Fruit) fruit.newInstance();
}
}
抽象package design.simplefactory;
public interface Fruit {
void get();
}
具體產品
package design.simplefactory;
public class Apple implements Fruit {
@Override
public void get() {
System.out.println("蘋果");
}
}
package design.simplefactory;
public class Banana implements Fruit {
@Override
public void get() {
System.out.println("香蕉");
}
}
測試類package design.simplefactory;
public class MainClass {
public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
FruitFactory.getFruit("design.simplefactory.Apple").get();
FruitFactory.getFruit("design.simplefactory.Banana").get();
}
}