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I'm making this code for class but it will only display the number of days as 28 29 or 30. Im new to Java and would really appreciate help.

```
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package days;
/**
*
* @author Curtie
*/import javax.swing.JOptionPane;
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
//Get user input
String month = JOptionPane.showInputDialog("Enter the number of the month you want to know the days of.");
String year = JOptionPane.showInputDialog("What year is your month in?");
//Convert string to integer
int years = Integer.parseInt(year);
int months = Integer.parseInt(month);
//Intitialize variable days
int days = 0;
//Code to determine if leap year for February
if(months == 2){
if((years % 4 == 0 && years % 100 != 0) || (years % 400 == 0)) days = 29;
else days = 28;}
if(months == 1) days = 31;
if(months == 3) days = 31;
if(months == 5) days = 31;
if(months == 7) days = 31;
if(months == 8) days = 31;
if(months == 10) days = 31;
if(months == 12) days = 31;
else days = 30;
JOptionPane.showMessageDialog(null, days);
}
}
```