Which of the following expressions correctly returns an...

Which of the following expressions correctly returns an integer that represents the month of a LocalDate object named hireDate?
a. getMonth(hireDate)
b. getMonthValue(hireDate)
c. hireDate.getMonthValue()
d. hireDate.setMonthValue()

Key Concepts

LocalDate

LocalDate is a class within the Java Date and Time API that represents a date without a time-zone, encapsulating year, month, and day. It is immutable and provides methods to retrieve individual components of the date, making it a fundamental tool for date manipulation in Java.

Method Invocation in Object-Oriented Programming

In Java, methods attached to objects are invoked using dot notation, allowing developers to access an object's behavior. This precise syntax ensures that methods are called on valid object instances, thereby properly encapsulating functionality within objects.

Java Date and Time API

The Java Date and Time API is a collection of classes and methods integrated into the Java programming language to facilitate date and time operations. It includes various classes designed to handle dates, times, intervals, and periods, ensuring that date-time management is both intuitive and reliable.

getMonthValue Method

The getMonthValue() method is a member of the LocalDate class in Java that returns the month as an integer value. This method is specifically designed to extract the numeric month from a date, providing a simple and effective way of accessing date components.

Transcript

00:01 Okay, here we have a problem from barron's ap science 7th edition computer science.

00:07 This is a, this book question i think was missing the actual mystery class that it was referencing, not the date class.

00:17 I think the numerate algorithm just messed up the way to pull the actual question.

00:23 So to reference here, this is book question 13 in the book.

00:28 And i just pulled it from the actual book itself.

00:32 So here we have a class mystery and it's got two methods in it.

00:37 One is the strange method, which is going to take two x and two parameters, both integers, one's named x, one's y.

00:44 It's going to take the x parameter and add y to it and reference itself here.

00:50 And y is going to equal y times x.

00:55 And that's after the instance variable x is given a new value up here.

01:00 And then those values are printed out.

01:03 And then next in our, this is our main method.

01:06 This is actually going to instantiate everything and use the strange method here.

01:10 We have two variables declared a and b, six and three.

01:15 And i'm just going to do a manual debug here to kind of demonstrate what happens here.

01:18 So six and three, so a is equal to six at the beginning and b is equal to three, just to clarify.

01:31 And they're going to be passed through the strange method at the beginning, or the second part of the main argument here.

01:39 So we have x is equal to three in this case, and then y is equal to six, because this is also equal to b.

01:54 This is equal to a at this point.

01:57 But just to clarify, x is the instance variable of a.

02:04 A is still holding its own value, same as y.

02:08 Y, or sorry, b is holding its own value and a is holding its own value...

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