1Z0-811 Java Methods and Scope Flashcards

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

Answer: It refers to the current object instance

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

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

Answer: private

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

Can a `static` method access instance variables directly?

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

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

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

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

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

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

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

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

Which of the following correctly declares a varargs parameter in a method?

Answer: public void print(String... args)

Varargs is declared using an ellipsis (`...`) after the type, allowing a method to accept zero or more arguments of that type.