shorten the script

[baum]

I've written an application that determines whether an input (a 5-digit number) is a palindrome or not.

1. After I've finished the code, it's long and not readable. Would you give me hints of an alternate method?

2. After the user has inputted a 6 or more digit long
number, or a 4 or less digit long number, an error message will be displayed and the application will be terminated. Would you give me some hints to let the user enter a number again?

Thank you.

The code:

import javax.swing.JOptionPane;

public class Palindrome {

public static void main( String args[] )
{
String testNum;
int testVal;

testNum = JOptionPane.showInputDialog ( "Input a five-digit integer" );

testVal = Integer.parseInt( testNum );

if ( testVal >= 100000 )
JOptionPane.showMessageDialog(
null, "The input is more than five-digit long",
"Test Result", JOptionPane.ERROR_MESSAGE );

else
if ( testVal <10000 )
JOptionPane.showMessageDialog(
null, &quot;The input is less than five-digit long&quot;,
&quot;Test Result&quot;, JOptionPane.ERROR_MESSAGE );

else
if (
(
( testVal - testVal % 10000 )
/ 10000
)
==
( testVal % 10000 % 1000 % 100 % 10 )
&&
(
(
( testVal % 10000 ) - (testVal % 10000 % 1000 )
)
/ 1000
)
==
(
(
(testVal % 10000 % 1000 % 100 )
- ( testVal % 10000 % 1000 % 100 % 10 )
)
/ 10
)
)
JOptionPane.showMessageDialog(
null, &quot;The input is a palindrome&quot;,
&quot;Test Result&quot;, JOptionPane.INFORMATION_MESSAGE );

else
JOptionPane.showMessageDialog(
null, &quot;The input is not a palindrome&quot;,
&quot;Test Result&quot;, JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );
}

}

 

[vgg]

Hi,

Instead of writing everything in main just have a method and test all your conditions and check for the user's input.
If the input is not as specified,display the appropriate message and call the same function again,recursively.

VGG