To put a class into a package you need to do two things.
First, put a "package declaration" at the top of the file. This looks like the word package followed by the name of the package and a ;
package dungeon;
class BugBear {
}Then you need to make sure that the .java file is in a folder matching the name of
that package.
So, for the example above, if your code was previously laid out like this
src/
BugBear.java
It needs to be changed to this.
src/
dungeon/
BugBear.java