Main.java:37: error: incompatible types: Cage<Animal> cannot be converted to Cage<? extends Pet>
        touchPet( animalCage ); // forbid :-)
                  ^
Main.java:41: error: incompatible types: Cage<Fox> cannot be converted to Cage<? extends Pet>
        touchPet( foxCage ); // forbid :-)
                  ^
Main.java:45: error: incompatible types: Cage<Cat> cannot be converted to Cage<? super Pet>
        pushPet( catCage ); // forbid :-)
                 ^
Main.java:46: error: incompatible types: Cage<Dog> cannot be converted to Cage<? super Pet>
        pushPet( dogCage ); // forbid :-)
                 ^
Main.java:47: error: incompatible types: Cage<Fox> cannot be converted to Cage<? super Pet>
        pushPet( foxCage ); // forbid :-)
                 ^
Main.java:49: error: incompatible types: Cage<Animal> cannot be converted to Cage<Pet>
        replacePet( animalCage ); // forbid :-)
                    ^
Main.java:51: error: incompatible types: Cage<Cat> cannot be converted to Cage<Pet>
        replacePet( catCage ); // forbid :-)
                    ^
Main.java:52: error: incompatible types: Cage<Dog> cannot be converted to Cage<Pet>
        replacePet( dogCage ); // forbid :-)
                    ^
Main.java:53: error: incompatible types: Cage<Fox> cannot be converted to Cage<Pet>
        replacePet( foxCage ); // forbid :-)
                    ^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
9 errors