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CyC2018 2018-06-04 16:19:17 +08:00
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@ -633,7 +633,95 @@ public class Client {
### 意图
定义算法框架,并将一些步骤的实现延迟到子类。通过模板方法,子类可以重新定义算法的某些步骤,而不用改变算法的结构。
定义算法框架,并将一些步骤的实现延迟到子类。
通过模板方法,子类可以重新定义算法的某些步骤,而不用改变算法的结构。
### 类图
<div align="center"> <img src="../pics//c3c1c0e8-3a78-4426-961f-b46dd0879dd8.png"/> </div><br>
### 实现
冲咖啡和冲茶都有类似的流程,但是某些步骤会有点不一样,要求复用那些相同步骤的代码。
<div align="center"> <img src="../pics//11236498-1417-46ce-a1b0-e10054256955.png"/> </div><br>
```java
public abstract class CaffeineBeverage {
final void prepareRecipe() {
boilWater();
brew();
pourInCup();
addCondiments();
}
abstract void brew();
abstract void addCondiments();
void boilWater() {
System.out.println("boilWater");
}
void pourInCup() {
System.out.println("pourInCup");
}
}
```
```java
public class Coffee extends CaffeineBeverage{
@Override
void brew() {
System.out.println("Coffee.brew");
}
@Override
void addCondiments() {
System.out.println("Coffee.addCondiments");
}
}
```
```java
public class Tea extends CaffeineBeverage{
@Override
void brew() {
System.out.println("Tea.brew");
}
@Override
void addCondiments() {
System.out.println("Tea.addCondiments");
}
}
```
```java
public class Client {
public static void main(String[] args) {
CaffeineBeverage caffeineBeverage = new Coffee();
caffeineBeverage.prepareRecipe();
System.out.println("-----------");
caffeineBeverage = new Tea();
caffeineBeverage.prepareRecipe();
}
}
```
```html
boilWater
Coffee.brew
pourInCup
Coffee.addCondiments
-----------
boilWater
Tea.brew
pourInCup
Tea.addCondiments
```
### JDK

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