In general, 10 packages are imported using the JShell.
The following command shows the packages that were imported by default.
jshell> /import
Output
import java.io.* import java.math.* import java.net.* import java.nio.file* import java.sql.* import java.util.* import java.util.regex* import java.util.function* import java.util.prefs* import java.util.stream.*
Importing a specific package using JShell
jshell> import java.util.*;