Stack cannot be resolved to a type

"Stack cannot be resolved to a type"的错误通常是由于未导入java.util.Stack包导致的。要解决这个问题，你需要在代码中添加以下导入语句：

import java.util.Stack;

如果你已经添加了这个导入语句，那么你需要检查一下你的代码中是否有其他错误，例如拼写错误或未创建却被使用的变量等。

相关问题

SmbmsUser cannot be resolved to a type

The error message "SmbmsUser cannot be resolved to a type" typically occurs when the compiler or IDE cannot find the definition of the class or interface named "SmbmsUser". This usually happens when the required import statement is missing or when the class is not properly imported.

To resolve this issue, you can try the following steps:

1. Verify that you have imported the correct package containing the "SmbmsUser" class. You can add an import statement at the top of your code file:

   import com.example.package.SmbmsUser;

2. Ensure that the required dependency or library containing the "SmbmsUser" class is correctly added to your project. If you are using a build tool like Maven or Gradle, check your project configuration file (e.g., pom.xml or build.gradle) for any missing dependencies.

3. Double-check if the "SmbmsUser" class exists and is accessible in your project's source code. Ensure that the class is properly defined and not misspelled.

4. If you are working in an IDE, perform a clean and rebuild of your project to refresh the classpath and resolve any potential compilation issues.

If none of these steps solve the problem, please provide more information about your project structure, the relevant code snippet where you are encountering this error, and any additional error messages or stack traces. This will help in providing a more specific solution.

KDTreeSearcher cannot be resolved to a type 需要引入什么库 Java代码

这个错误提示通常是因为缺少对 KDTreeSearcher 类型的引用。这个类型通常属于某个库或者框架，你需要在代码中引入该库或者框架，并且确保已经将库文件加入到了项目的 classpath 中。

具体需要引入哪个库取决于你的代码中使用了哪些类和方法。你可以在 Google 或者 Stack Overflow 上搜索这个类的相关信息，看看哪些库提供了该类型的实现，并且为你的项目添加相应的依赖。

如果你已经知道了使用 KDTreeSearcher 类型的库，可以在代码中添加类似于下面这样的 import 声明：

import com.example.kdtree.KDTreeSearcher;

其中 `com.example.kdtree` 应该是你所使用的库的包名。