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This example illustrates how to make swing program to find the factorial number. In this example you can see that, when user run this program on console then a input box will be appear for entering a number which user want to find factorial. When user enter correctly the integer value then the output will display on the message box.
Source Code of Factorial1.java
import java.io.*;
import javax.swing.JOptionPane;
public class Factorial1
{
public static void main(String args[])
throws IOException
{
int n,fact=1;
try
{
String input = JOptionPane.showInputDialog(
"Welcome to Factorial program Enter n: ");
n = Integer.parseInt(input);
if(n<0)
{
JOptionPane.showMessageDialog
(null,"factorial not possible n="+n);
}
else if(n==0)
{
JOptionPane.showMessageDialog
(null,"factorial of 0=1");
}
else if(n>0)
{
int tem=n;
while(n>0)
{
fact=fact*n;
n--;
}
JOptionPane.showMessageDialog
(null,"factorial of "+tem+"="+fact);
}
}catch (Exception e)
{
JOptionPane.showMessageDialog
(null,e.getMessage()+": please inter integer no");
}
}
} |
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