在 Java 中实例化 google-collections 的 BiMap
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To instantiate BiMap Of google-collections in Java
提问by Léo Léopold Hertz ??
How can you instantiate a Bimapof Google-collections?
如何实例化一个BimapGoogle 集合？
I've read the question Java: Instantiate Google Collection's HashBiMap
我已经阅读了问题Java: Instantiate Google Collection's HashBiMap
A sample of my code
我的代码示例
import com.google.common.collect.BiMap;
public class UserSettings {
private Map<String, Integer> wordToWordID;
UserSettings() {
this.wordToWordID = new BiMap<String. Integer>();
I get cannot instantiate the type BiMap<String, Integer>.
我明白了cannot instantiate the type BiMap<String, Integer>。
回答by Michael Myers
As stated in the linked question, you are supposed to use the create()factory methods.
如链接问题所述，您应该使用create()工厂方法。
In your case, this means changing
在你的情况下，这意味着改变
this.wordToWordID = new BiMap<String. Integer>();
to
到
this.wordToWordID = HashBiMap.create();
回答by brabster
BiMapis an interface, and as such cannot be instantiated. You need to instantiate a concrete subclass according to the properties you want, available subclasses (according to the javadoc) are EnumBiMap, EnumHashBiMap, HashBiMap, ImmutableBiMap.
BiMap是一个接口，因此无法实例化。您需要根据所需的属性实例化一个具体的子类，可用的子类（根据 javadoc）是EnumBiMap、EnumHashBiMap、HashBiMap、ImmutableBiMap。
回答by Joao Sousa
Another cool way to create a BiMap, but in this case an immutable BiMap, is using the ImmutableBiMap.Builder.
创建 BiMap 的另一种很酷的方法是使用ImmutableBiMap.Builder.
static final ImmutableBiMap<String, Integer> WORD_TO_INT =
new ImmutableBiMap.Builder<String, Integer>()
.put("one", 1)
.put("two", 2)
.put("three", 3)
.build();
http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/ImmutableBiMap.html
http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/ImmutableBiMap.html
