如今的農場有三種水果:Grape、Strawberry、Apple.app
一名園丁在管理整個農場,向市場提供現有的水果:ui
public class FruitGardener {
public static Fruit factory(String which)throws NoFruitException{
if(which.equalsIgnoreCase("apple")){
return new Apple();
}else if(which.equalsIgnoreCase("grape")){
return new Grape();
}else if(which.equalsIgnoreCase("strawberry")){
return new Strawberry();
}else{
throw new NoFruitException("Wrong fruit request!");
}
}
}
public class NoFruitException extends Exception {
public NoFruitException(String msg){
super(msg);
}
}
水果都是這樣的.水果接口:
public interface Fruit {
//生長
void grow();
//收穫
void harvest();
//種植
void plant();
}接口
蘋果是這樣的:it
public class Apple implements Fruit{
public void grow() {
System.out.println("Apple is growing...");
}
public void harvest() {
System.out.println("Apple has been harvested.");
}
public void plant() {
System.out.println("Apple has bean planted.");
}
}
葡萄是這樣的:
public class Grape implements Fruit{
public void grow() {
System.out.println("Grape is growing...");
}
public void harvest() {
System.out.println("Grape has bean harvested.");
}
public void plant() {
System.out.println("Grape has bean planted.");
}
}io
草莓是這樣的:
public class Strawberry implements Fruit{
public void grow() {
System.out.println("Strawberry is growing...");
}
public void harvest() {
System.out.println("Strawberry has bean harvested.");
}
public void plant() {
System.out.println("Strawberry has bean planted.");
}
}
市場是這樣的:
try{
FruitGardener.factory("grape");
FruitGardener.factory("Apple");
FruitGardener.factory("strawberry");
}catch(NoFruitException ex){
}
最近香蕉價格漲停,可是這個園丁不會種,老闆考慮是換一個園丁或者讓這個園丁去osc培訓種香蕉呢?不管如何加班是必定的了 class