在Effective Java书中实现Builder接口

Question

我正在阅读Joshua Bloch的Effective Java。在16页的顶部，他说：

Note that our NutritionFacts.Builder class could be declared to implement 
Builder<NutritionFacts>. 

但是，不管是“生成器”实现“生成器”界面，因为有一个命名空间冲突存在，如：

public static class Builder implements Builder<NutritionFacts>... 

我应该重新命名内部静态类到像NutritionFacts.NutritionBuilder或什么？

这里是他提供的建造者模式：

// Builder Pattern 
public class NutritionFacts { 
private final int servingSize; 
private final int servings; 
private final int calories; 
private final int fat; 
private final int sodium; 
private final int carbohydrate; 

public static class Builder { 
    // Required parameters 
    private final int servingSize; 
    private final int servings; 

    // Optional parameters - initialized to default values 
    private int calories  = 0; 
    private int fat   = 0; 
    private int carbohydrate = 0; 
    private int sodium  = 0; 

    public Builder(int servingSize, int servings) { 
     this.servingSize = servingSize; 
     this.servings = servings; 
    } 

    public Builder calories(int val) 
     { calories = val;  return this; } 
    public Builder fat(int val) 
     { fat = val;   return this; } 
    public Builder carbohydrate(int val) 
     { carbohydrate = val; return this; } 
    public Builder sodium(int val) 
     { sodium = val;  return this; } 

    public NutritionFacts build() { 
     return new NutritionFacts(this); 
    } 
} 

private NutritionFacts(Builder builder) { 
    servingSize = builder.servingSize; 
    servings  = builder.servings; 
    calories  = builder.calories; 
    fat   = builder.fat; 
    sodium  = builder.sodium; 
    carbohydrate = builder.carbohydrate; 
} 
} 

Answer 1

你可以完全限定接口名。

即：

public static class Builder implements my.package.Builder<NutritionFacts> {