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.