1Z0-829: Java SE 17 DeveloperDemo

Question

Given the following directory structure:

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Given the Doc class definition:

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Which two definitions of the WordDoc class are valid?

Choose three

A package p1.p2;public non-sealed class WordDoc extends Doc { }
B package p1;public final class WordDoc extends Doc {}
C package p1;non-sealed abstract class WordDoc extends Doc {}
D package p1.p2:public sealed class WordDoc extends Doc { }
E package p1;public class WordDoc extends Doc {}
F package p1;public non-sealed class WordDoc extends Doc {}

Explanation

permits WordDoc denotes p1.WordDoc. A direct subclass of a sealed class must explicitly be declared final, sealed, or non-sealed. Therefore, the final declaration and both non-sealed declarations in package p1 are valid. An abstract class may also be non-sealed; the Java Language Specification does not require such a permitted subclass to be public. The item consequently contains three valid choices, despite instructing the reader to choose two.

Learn more

Java Language Specification, Chapter 8: Classes

1Z0-829: Java SE 17 DeveloperDemo

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Notes

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