1Z0-811 1Z0-811 Java Methods and Scope 2

Question 1

What is the purpose of the `this` keyword inside an instance method?

Accepted Answer

It refers to the current object instance

Answer

The `this` keyword refers to the current instance of the class and is used to access its fields and methods.

Question 2

Which access modifier restricts a method's visibility to the same class only?

Accepted Answer

private

Answer

The `private` access modifier makes a method accessible only within the class in which it is declared.

Question 3

Can a `static` method access instance variables directly?

Accepted Answer

No, because static methods belong to the class, not an instance

Answer

Static methods do not have access to instance variables directly because they are not associated with any object instance.

Question 4

Which of the following is true about variable shadowing in Java?

Accepted Answer

It occurs when a local variable has the same name as an instance variable

Answer

Variable shadowing occurs when a local variable or parameter has the same name as an instance variable, hiding the instance variable within that scope.

Question 5

What is the difference between pass-by-value and pass-by-reference in the context of Java method arguments?

Accepted Answer

Java uses pass-by-value; for objects, the reference value (address) is passed

Answer

Java always passes arguments by value; for object types, the value passed is the reference (memory address) of the object, not the object itself.

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

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

1Z0-811 1Z0-811 Java Methods and Scope 2