Java Eclipse 中的错误：方法...来自类型...指的是缺少的类型条目
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Error in Eclipse: The method ... from the type ... refers to the missing type Entry
提问by
I'm trying to use a function that uses the Entryobject but I am getting the above error message. The function looks like this:
我正在尝试使用使用该Entry对象的函数，但收到上述错误消息。该函数如下所示：
public Entry<K,V> insert(K k, V v) throws InvalidKeyException {
//code here
}
I tried importing java.util.*but that didn't work.
我尝试导入，java.util.*但没有奏效。
Could someone please explain to me what this error message is telling me and how to resolve it?
有人可以向我解释这个错误消息告诉我什么以及如何解决它吗？
回答by atk
Trying to import java.util.*was on the right track, because you are trying to use a class that isn't in the current namespace. The reason it didn't work is because Entryisn't in the java.utilpackage. In order to import the class, you need to know what package the class is in.
尝试导入java.util.*是在正确的轨道上，因为您正在尝试使用不在当前命名空间中的类。它不起作用的原因是因为Entry它不在java.util包中。为了导入类，您需要知道类在哪个包中。
Where did you find the Entryclass? If you read Entry's javadoc, then go back and look at the javadoc and see what package it's in. If you are getting an Entryobject as the result of a call to another method, look at the javadoc for that method, then follow the link to the Entryclass, and see where Entryis defined.
你在哪里找到的Entry班级？如果您阅读了Entry的 javadoc，则返回并查看 javadoc 并查看它在哪个包中。如果您Entry通过调用另一个方法获得一个对象，请查看该方法的 javadoc，然后点击链接到Entry类，看看在哪里Entry定义。
If you are trying to use some custom Entryclass, be sure that you've defined it. If you haven't defined your custom Entryclass, it won't be defined when you try to use it.
如果您尝试使用某个自定义Entry类，请确保您已经定义了它。如果你没有定义你的自定义Entry类，当你尝试使用它时它不会被定义。
回答by wchargin
It's an inner classof Map.
这是一个内部类的Map。
Either
任何一个
import java.util.Map.Entry;
or
或者
public Map.Entry<K,V> insert(K k, V v) throws InvalidKeyException {
//code here
}
