Question

Java Program 4: Methods Purpose: To practice using both void and value-returning methods and understand when, where, and how to use them. The following problem employs the use of both void and value-returning methods: (Be sure to start with an algorithm to help you organize your ideas and provide a blueprint as to how to approach the problem. Think about what kind of return type your method will need. Carefully examine and follow ALL the program specifications (for full credit). Leap Year Program: Design a program that asks the user to enter a four-digit year and then determines if that year is a leap year. Your program must contain at least the following four methods according to the following descriptions: (Note that your main method will consist primarily of calls to these four methods).. Methods: 1) displayInstructions : this method will tell the user what the program does, what to input, and what will be displayed as a result of running the program. It will not return any value nor will it need any formal parameters. 2) getYear has no formal parameters. It only asks the user to input a year and then returns that year as an integer value. 3) isLeap method has a formal integer parameter called year. It determines if a year is a leap year, and then returns a Boolean value (true or false) depending on whether the year is a leap year or not. How to determine if a year is a leap year? Rule: a year is a leap year if it is divisible by 4, but not divisible by 100, except when it is divisible by 400. (Hint: think about using the modulus operator here.) 4) displayResults has two formal parameters, the year and a boolean variable containing the value returned from method isLeap. This method will not need to return a value. It will simply display the year and display whether or not that year is a leap year. Be sure to carefully examine and follow ALL the above program specifications as described. When coding your methods, a technique that experienced programmers often use is to code one method at a time and test it to make sure it works before moving to the next method. This will really simplify your debugging process considerably. Is strongly suggest you employ this step-by-step process. Screen results for this program might look like this: First Run: This program asks you to enter a year as a 4 digit number. The output will indicate whether the year you entered is a leap year or not. Enter a year: 2010 2010 is not a leap year. Second Run: This program asks you to enter a year as a 4 digit number. The output will indicate whether the year you entered is a leap year. Enter a year: 2008 2008 is a leap year. Third Run: This program asks you to enter a year as a 4 digit number. The output will indicate whether the year you entered is a leap year. Enter a year: 1900 1900 is not a leap year. Fourth Run: This program asks you to enter a year as a 4 digit number. The output will indicate whether the year you entered is a leap year. Enter a year: 2000 2000 is a leap year. Lab Submission Guidelines: Be sure to make your program user friendly and add prologue comments at the top of your program as well as JavaDoc comments at the beginning of each method (follow JavaDoc examples in the text or in my PowerPoint slides).

Answer 1

Thanks for the question.

Below is the code you will be needing  Let me know if you have any doubts or if you need anything to change.

Thank You !

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import java.util.Scanner;

public class LeapYearChecker {


    public static void main(String[] args) {


        displayInstruction();
        int year = getYear();
        boolean isLeapYear = isLeap(year);
        displayResults(year, isLeapYear);

    }

    /*
    Method accepts year and the leap year status
    Method prints the year and the if its a leap year or not
     */
    private static void displayResults(int year, boolean isLeapYear) {

        if (isLeapYear) {
            System.out.println( year + " is a leap year.");
        } else {
            System.out.println( year + " is not a leap year.");
        }
    }

    // displayInstructions
    private static void displayInstruction() {

        System.out.println("This program asks you to enter a year as a 4 digit number." +
                "The output will indicate whether the year you entered is a leap year.");

        System.out.println();
    }

    /*
       Method ask user for a year
       Methos returns the year as int
     */
    private static int getYear() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a year: ");
        int year = scanner.nextInt();
        return year;
    }

    /*
        Method accept an int for the year
        Method returns boolean if the year was a leap year else false if not
     */
    private static boolean isLeap(int year) {

        boolean flag = false;
        if (year % 400 == 0) {
            flag = true;
        } else if (year % 100 == 0) {
            flag = false;
        } else if (year % 4 == 0) {
            flag = true;
        } else {
            flag = false;
        }
        return flag;
    }

}

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let me know if you have any doubts or if you need anything to change.

If you are satisfied with the solution, please rate the answer.

Thanks!

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