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5d9ee7efee
- 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.
35 lines
622 B
Kotlin
Vendored
35 lines
622 B
Kotlin
Vendored
import java.util.ArrayList
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import java.util.Arrays
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abstract class A {
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abstract fun foo(): List<String>
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}
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interface B {
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fun foo(): ArrayList<String> = ArrayList(Arrays.asList("B"))
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}
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open class C : A(), B {
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override fun foo(): ArrayList<String> = super<B>.foo()
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}
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interface D {
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fun foo(): Collection<String>
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}
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class E : D, C()
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fun box(): String {
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val e = E()
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var r = e.foo()[0]
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val d: D = e
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val c: C = e
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val b: B = e
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val a: A = e
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r += d.foo().iterator().next()
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r += c.foo()[0]
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r += b.foo()[0]
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r += a.foo()[0]
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return if (r == "BBBBB") "OK" else "Fail: $r"
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}
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