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Java 8 rules for method overrides:

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- base class method wins against a (default) interface method,
so an abstract base class method should always be implemented
in a derived class;

- interface methods clash regardless of abstract/default
with possibly undefined behavior at run-time,
so a class or interface should always define its own method
for methods inherited from multiple interfaces and not from base class;

- meaningful diagnostics for class inheriting conflicting JVM signatures.
Since no override will happen under Java 8 rules,
ACCIDENTAL_OVERRIDE is misleading for this case;

- update testData.
This commit is contained in:
Dmitry Petrov
2015-10-07 14:43:39 +03:00
parent 82c0265cb3
commit 5d9ee7efee
46 changed files with 381 additions and 212 deletions
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compiler/testData/diagnostics/tests/java8Overrides/defaultVsAbstract.txt
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+38
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package
public abstract class ADerived : ILeft, IRight {
public constructor ADerived()
public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public open override /*2*/ /*fake_override*/ fun foo(): kotlin.Unit
public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
}
public final class CDerived : ILeft, IRight {
public constructor CDerived()
public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public open override /*2*/ /*fake_override*/ fun foo(): kotlin.Unit
public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
}
public interface IDerived : ILeft, IRight {
public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public open override /*2*/ /*fake_override*/ fun foo(): kotlin.Unit
public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
}
public interface ILeft {
public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public open fun foo(): kotlin.Unit
public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
}
public interface IRight {
public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
public abstract fun foo(): kotlin.Unit
public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
}