Java SE 8 Programmer II Practice Questions - Oracle Certified Professional, Java SE 8 Programmer II (Exam 1Z0-809) Exam

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Given: class Animal { String speak() { return "..."; } } class Dog extends Animal { @Override String speak() { return "Woof"; } } Animal a = new Dog(); String s = a.speak(); What is the value of s, and why?

"Woof" because virtual method invocation uses the runtime type Dog "..." because the declared type Animal determines which method runs A compile error because speak() is package-private and cannot be overridden "Woof" only if speak() is declared public in both classes

Correct Answer:

"Woof" because virtual method invocation uses the runtime type Dog

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