cannot find symbol hashmapset;

The error message "cannot find symbol hashmapset" usually means that the Java compiler cannot find the class or interface "HashSet" from the java.util package, which is used to implement a hash table data structure.

To fix this error, you can try importing the HashSet class at the beginning of your Java program using the following statement:

import java.util.HashSet;

If the error persists, you may need to check if you have the correct version of Java installed and if your classpath is set up correctly.

相关问题

cannot find symbol

"cannot find symbol" 的意思是编译器无法找到符号，通常表示编译器无法识别代码中某个标识符。可能的原因包括:
- 标识符拼写错误
- 标识符尚未声明
- 标识符的作用域不正确

如果你在编写程序时遇到了这个错误,应该检查你的代码，确保所有标识符都正确拼写，并在使用之前声明。

mvn cannot find symbol

When Maven cannot find a symbol, it means that a required class or method is missing or not available in the classpath. This error can occur due to various reasons such as:

1. Missing dependency: If a required dependency is not declared in the POM file or is not available in the local or remote repository, Maven cannot find the symbol.

2. Incorrect package name: If the package name of the class is incorrect or does not match the directory structure, Maven cannot find the symbol.

3. Compilation error: If there is a compilation error in the code, Maven cannot find the symbol.

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

1. Check the POM file for missing dependencies and add them if necessary.

2. Check the package name and directory structure of the class.

3. Check the code for compilation errors and fix them.

4. Clean and rebuild the project using the command "mvn clean install".

5. If the symbol is provided by a third-party library, make sure that the library is added to the classpath.

6. If the error persists, try running Maven in debug mode (-X option) to get more information about the error.