1Z0-811 1Z0-811 Java Methods and Scope 3

Question 1

What is method chaining in Java?

Accepted Answer

Calling multiple methods sequentially on the same object by returning `this`

Answer

Method chaining allows multiple method calls to be linked on the same object when each method returns `this` or another object.

Question 2

Which of the following method signatures would cause a compilation error due to ambiguity in overloading?

Accepted Answer

void test(int a) and int test(int a)

Answer

Two methods with the same name and parameter list but different return types are not valid overloads and cause a compilation error.

Question 3

What does it mean for a method to be `final`?

Accepted Answer

It cannot be overridden in a subclass

Answer

A `final` method cannot be overridden by subclasses, ensuring its behavior remains unchanged in the inheritance hierarchy.

Question 4

In Java, where can a local variable be declared?

Accepted Answer

Anywhere inside a block where it is needed

Answer

Local variables in Java can be declared anywhere inside a block, but they must be initialized before use.

Question 5

Which statement about abstract methods is correct?

Accepted Answer

Abstract methods have no body and must be implemented by concrete subclasses

Answer

An abstract method has no implementation body and requires any concrete (non-abstract) subclass to provide its implementation.

(1Z0-811) Oracle Java SE11 Programmer Practice Test