Java：实例化Google Collection的HashBiMap [英] Java: Instantiate Google Collection's HashBiMap

问题描述

我正在使用Eclipse，并且我已将 google-collect.1.0-rc2.jar 添加为引用库。但不知怎的，这仍然不起作用：

I'm using Eclipse, and I've added google-collect.1.0-rc2.jar as a referenced library. Yet somehow this still doesn't work:

import com.google.common.collect.HashBiMap;

public class Odp {        
    //...

    HashBiMap<Character, Integer> charOcc =
        HashBiMap<Character, Integer>.create();    
}

Eclipse出现以下错误：

Eclipse gives the following errors:

此行的多个标记

Multiple markers at this line

• 无法解析HashBiMap


• 无法解析Character.Integer


• 令牌，，。上的语法错误。预期


• 令牌。上的语法错误，删除此令牌


• 类Odp的方法create（）未定义

• HashBiMap cannot be resolved
• Character.Integer cannot be resolved
• Syntax error on token ",", "." expected
• Syntax error on token ".", delete this token
• The method create() is undefined for class Odp

我做错了什么？

其他谷歌的东西，像乔纳一样，工作得很好。 （但Joiner不是通用的。）

Other Google stuff, like Joiner, works fine. (But Joiner is not generic.)

推荐答案

调用静态泛型函数时，不传递类型参数：

When calling static generic functions, you don't pass the type parameters:

 HashBiMap<Character, Integer> charOcc = HashBiMap.create();

你真的不应该编写实现类代码，所以你最好不要做

Also really you shouldn't code to the implementation class, so you're better off doing

 Map<Character, Integer> charOcc = HashBiMap.create();

或

 BiMap<Character, Integer> charOcc = HashBiMap.create();

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