Help with command line arguments

[LyndsayJ]

Hi, I am working on a java program for my class where I have to rewrite a code that checks whether the input is a palindrom by passing the string as a command-line argument.
Here is the code that I have to rewrite. PLEASE HELP!!

import javax.swing.JOptionPane;
 
public class CheckPalindrome
{
    public static void main(String [] args)
    {
        String s = JOptionPane.showInputDialog("Enter a string");
 
        String output = "";
 
        if(isPalindrome(s))
            output = s + " is a palindrome.";
        else
            output = s + " is not a palindrome.";
 
        JOptionPane.showMessageDialog(null, output);
    }
 
    public static boolean isPalindrome(String s)
    {
        int low = 0;
 
        int high = s.length() - 1;
 
        while(low < high)
        {
            if(s.charAt(low) != s,charAt(high))
                return false;
 
            low++;
            high--;
        }
        return true;
    }
}
 

[dmjpro]

welcome to TSDN

u r trying to compare the first half characters and the last half characters.
is this right to check a string .... palyndrom????

what J2SE version u r using????
there r lot of APIs ..... handling with string.

if u r using Swing then why r u having main function?????

and one more thing .... ur Q. title is related to command line arguments, but u have not used this.......

so at the end i totally mess up.....would u be more clear???

[r035198x]

Hi, I am working on a java program for my class where I have to rewrite a code that checks whether the input is a palindrom by passing the string as a command-line argument.
Here is the code that I have to rewrite. PLEASE HELP!!

import javax.swing.JOptionPane;
 
public class CheckPalindrome
{
    public static void main(String [] args)
    {
        String s = JOptionPane.showInputDialog("Enter a string");
 
        String output = "";
 
        if(isPalindrome(s))
            output = s + " is a palindrome.";
        else
            output = s + " is not a palindrome.";
 
        JOptionPane.showMessageDialog(null, output);
    }
 
    public static boolean isPalindrome(String s)
    {
        int low = 0;
 
        int high = s.length() - 1;
 
        while(low < high)
        {
            if(s.charAt(low) != s,charAt(high))
                return false;
 
            low++;
            high--;
        }
        return true;
    }
}
 

Could you tell us what specific problem you have with this.

[LyndsayJ]

Could you tell us what specific problem you have with this.

I thought I was specific...I have to rewrite the code that I posted in my original message so that I pass the input as a command line argument...rath er than entering the date using input dialog boxes...BUT, I figured it out...that's for responding though!

[cnorthcutt]

I have the same problem also. What did you come up with?

Hi, I am working on a java program for my class where I have to rewrite a code that checks whether the input is a palindrom by passing the string as a command-line argument.
Here is the code that I have to rewrite. PLEASE HELP!!

import javax.swing.JOptionPane;
 
public class CheckPalindrome
{
    public static void main(String [] args)
    {
        String s = JOptionPane.showInputDialog("Enter a string");
 
        String output = "";
 
        if(isPalindrome(s))
            output = s + " is a palindrome.";
        else
            output = s + " is not a palindrome.";
 
        JOptionPane.showMessageDialog(null, output);
    }
 
    public static boolean isPalindrome(String s)
    {
        int low = 0;
 
        int high = s.length() - 1;
 
        while(low < high)
        {
            if(s.charAt(low) != s,charAt(high))
                return false;
 
            low++;
            high--;
        }
        return true;
    }
}
 

[dmjpro]

Hi, I am working on a java program for my class where I have to rewrite a code that checks whether the input is a palindrom by passing the string as a command-line argument.
Here is the code that I have to rewrite. PLEASE HELP!!

import javax.swing.JOptionPane;
 
public class CheckPalindrome
{
    public static void main(String [] args)
    {
        String s = JOptionPane.showInputDialog("Enter a string");
 
        String output = "";
 
        if(isPalindrome(s))
            output = s + " is a palindrome.";
        else
            output = s + " is not a palindrome.";
 
        JOptionPane.showMessageDialog(null, output);
    }
 
    public static boolean isPalindrome(String s)
    {
        int low = 0;
 
        int high = s.length() - 1;
 
        while(low < high)
        {
            if(s.charAt(low) != s,charAt(high))
                return false;
 
            low++;
            high--;
        }
        return true;
    }
}
 

So you don't want to use Swing :-)
So simply do it .............

//String s = JOptionPane.showInputDialog("Enter a string");
//now change this line to..............
String s = args[0];
 

If you want to check whether user passes the arguments then you can also do it..

if(args.length==0) return;
 

Enjoy the code.

Debasis Jana

[r035198x]

I have the same problem also. What did you come up with?

Why don't you post what you've done so far?