Remove/Add import statement in Java class file

I need to replace the import statement in java class due to package changes.

**Current:**
`import org.springframework.security.annotation.*;`

**Expected**
`import org.springframework.security.access.annotation.*;`

However, I don't find any spoon class/method to remove or add import statement.
one way to add import (which I already tried) is to use any class from new package so that spoon will import automatically but it does not remove old import and causes compilation error.

Help on how to remove and add import statement is appreciated!