Can someone Pls help me with writing a program to display the day when we enter the date Month and year?

Answer 1

import java.time.LocalDate;
import java.util.Scanner;

public class Testclass {

public static void main(String[] args) {
// Getting user input
System.out.println("Please enter Date (yyyy-mm-dd):");
Scanner in = new Scanner(System.in);
String inputDate = in.nextLine();
// Converting to int
String[] splitDate = inputDate.split("-");
int year = Integer.valueOf(splitDate[0]);
int month = Integer.valueOf(splitDate[1]);
int day = Integer.valueOf(splitDate[2]);
// Weekday of the given date
LocalDate localDate = LocalDate.of(year, month, day);
System.out.println(localDate.getDayOfWeek());
}
}

Note: there is no Exceptionhandling if the user enters bad values.

Answer 2

Here are the steps:

1) Create variables year_code, month_code, code (all int). Initialise them to 0.

2) Prompt user for year, month and date. Store these values in variables year, month, date respectively (all int).

3) Use the % operator to find out the first 2 and last 2 digits of the year. We'll store the first 2 digits in a variable f2d and last 2 digits in l2d.

4) Set year_code to l2d, then increase its value by (l2d / 4). year_code should have 1.25 times the value of l2d, ignoring remainders.

5) Look at f2d. Initialise j to f2d % 4. If j is 1, add 5 to year_code; if j is 2, add 3 instead; if j is 3, add 1 instead; if j is 0, leave it.

6) year_code %= 7

7) Look at the month. Convert it to numbers 1 - 12 for simplicity's sake.

8) If month is 1 and it's not a leap year, set month_code to 6. If it's a leap year, set it to 5.

For simplicity's sake (mc is month_code):
month: 1, mc: 6, if leap then mc: 5
month: 2, mc: 2, if leap then mc: 1
month: 3 or 11, mc: 2
month: 4 or 7, mc: 5
month: 5, mc: 0
month: 6, mc: 3
month: 8, mc: 1
month: 9 or 12, mc: 4
month: 10, mc: 6

9) Add the date, month_code and year_code together. Store the result in code.

10) code %= 7

11) If code is 0, print "Sunday"; if code is 1, print "Monday", if code is 2, print "Tuesday", etc.

12) We're done!

Hopefully this is helpful.

Answer 3

Just to confirm, do you mean day of the week (Monday, Tuesday, etc.)?

Answer 4

I'm sorry, I only have a C# code for that.

Answer 5

Yes @ Samuel Neo

Answer 6

Why don't you explain me the logic in brief @Samuel Neo

Answer 7

Apparently there's a getDayOfWeek() method in Java as shown in Roland's answer.
You can use that.