Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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What feature was introduced in Java SE5 related to method return types during inheritance?

  1. Overriding with covariant return types

  2. Static method inheritance

  3. Final method overriding

  4. Private method inheritance

The correct answer is: Overriding with covariant return types

Java SE5 introduced the concept of overriding with covariant return types in method inheritance. Covariant return types allow subclasses to override the method in the superclass with a return type that is a subclass of the original return type. This allows for more flexibility in method return types during inheritance. The other options, static method inheritance, final method overriding, and private method inheritance, are not features introduced in Java SE5 related to method return types during inheritance. Static methods can be inherited in Java, but the same method cannot have different return types in the superclass and subclass. Final methods cannot be overridden, and private methods cannot be inherited at all. Therefore, these options do not relate to the introduction of covariant return types in Java SE5.