是否可以在 Java 中返回 HashMap 对象？
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Is it possible to return a HashMap object in Java?
提问by user6437583
I have a method that maps keywords to a certain value. I want to return the actual hashmap so I can reference its key/value pairs
我有一种方法可以将关键字映射到某个值。我想返回实际的哈希图，以便我可以引用它的键/值对
回答by Cache Staheli
Yes. It is easily possible, just like returning any other object:
是的。这很容易实现，就像返回任何其他对象一样：
public Map<String, String> mapTheThings(String keyWord, String certainValue)
{
Map<String, String> theThings = new HashMap<>();
//do things to get the Map built
theThings.put(keyWord, certainValue); //or something similar
return theThings;
}
Elsewhere,
别处，
Map<String, String> actualHashMap = mapTheThings("keyWord", "certainValue");
String value = actualHashMap.get("keyWord"); //The map has this entry in it that you 'put' into it inside of the other method.
Note, you should prefer to make the return type Mapinstead of HashMap, as I did above, because it's considered a best practice to always program to an interface rather than a concrete class. Who's to say that in the future you aren't going to want a TreeMapor something else entirely?
请注意，您应该更喜欢使用 return typeMap而不是HashMap，就像我上面所做的那样，因为始终将程序编程为 interface 而不是具体的 class被认为是最佳实践。谁能说将来你不会TreeMap完全想要一个或其他东西？
