Able to override compareTo in enum declaration

Issue #100 resolved
Jesper Öqvist created an issue

JastAddJ 7.1.1-278-gc0dea6d Java SE 7

It is possible to override compareTo in an enum declaration. This should not be allowed.

Test case:

// Test overriding final method in enum superclass (java.lang.Enum)
// .result=COMPILE_FAIL
enum Test {
        public int compareTo(Object other) {
                return 1;

Comments (4)

  1. Jesper Öqvist reporter

    This problem stems from an issue with override checking where the Comparable<T> interface is not taken into account. Since java.lang.Enum<E extends java.lang.Enum<E>> implements Comparable<E> and the compareTo(T) method in Comparable<E> have the same erased signature as Test.compareTo in the example above, the Test.compareTo method cannot implement/override the Comparable.compareTo method, and even if it could it would conflict with the final declaration of compareTo in java.lang.Enum.

  2. Jesper Öqvist reporter

    Checking of incompatible overrides due to erasure should be improved in JastAddJ, but this is better handled in a separate issue.

  3. Jesper Öqvist reporter

    Check for conflicting methods using erasure

    Fixed issue making it possible to declare a method with the same erased signature as an inherited method, yet which did not override that method.

    This was fixed by adding an explicit check for inherited methods with conflicting erased signatures. The fix uses a new attribute TypeDecl.erasedAnestorMethodsMap.

    fixes #103 (bitbucket) fixes #100 (bitbucket)

    → <<cset 25e77e0b318b>>

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