How to write a program to determine if year is leap year or not

[Luis-Fernando]

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Hi,
I am last year B.Sc.IT student. I just started learning java language. In our last tutorial our sir has given us one program like write a program to determine if year is leap year or not. I tried various method but I unable to write that program. Please if you know any logic behind it then give it to me.
thank you.

[Praetor]

Here is the program.

import java.util.*;
import java.io.*;

public class LeapYear{
  public static void main(String[] args) throws IOException{
    BufferedReader inter = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Enter year : ");
    int y;
    try{
      y = Integer.parseInt(in.readLine());
      if(y < 1900 || y > 2100){
        System.out.print("enter year that is less than 2101 and greater than 1899.");
        System.exit(0);
      }
      GregorianCalendar c = new GregorianCalendar();
      if(c.isLeapYear(y))
        System.out.print("Enter year is leap year.");
      else
        System.out.print("Enter year is not leap year.");
    }
    catch(NumberFormatException ne){
      System.out.print(ne.getMessage() + " is not a proper number.");
      System.out.println("Please proper number.");
      System.exit(0);
    }
  }
}

[Katty]

I think this is one of the most simplest progran I have written.

public class LeapYear {

public static void main(String[] args) {
 
int y = 2004;

if(y % 4 == 0)

System.out.println("Year " + y + " is Leap year");

else

System.out.println("Year " +  + " is not Leap year");
}
}

[Zecho]

Use following code to write ptogram.

GregorianCalendar cal1 = new GregorianCalendar();
    boolean opt = cal1.isLeapYear(1998); 
    opt = cal1.isLeapYear(2000);        
    opt = cal1.isLeapYear(0);

[Reegan]

import java.text.ParseException;

public class MainClass {

  public static void main(String[] args) throws ParseException {
    System.out.println(isLeapYear(2000));
  }

  public static boolean isLeapYear(int y) {

    if (y < 0) {
      return false;
    }

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