Wildcard (star) imports like `import java.util.*;` are prohibited in the codebase as they reduce code readability and can cause naming conflicts. Always import specific classes individually. Configure your IDE to disallow wildcard imports: - In IntelliJ IDEA: Navigate to Editor -> Code Style -> Java -> Imports and set 'Class count to use import with *' to 999. - The same setting should be applied for 'Names count to use static import with *'. Instead of: ```java import java.util.*; ``` Use: ```java import java.util.List; import java.util.Map; import java.util.Set; ``` This makes dependencies explicit and avoids potential name conflicts when classes with the same name exist in different packages.