The following code example demonstrates how to Form a Palindrome by Removing One Digit in Java.

When a number is the same as its reverse, it is a palindrome. In the following program, first, check whether the given number is a palindrome or not. If it is a palindrome, then return -1. Otherwise, remove a digit from the number to make it a palindrome and return that digit. It is assumed that the number has only one digit that can be adjusted to make it a palindrome,

For example, let the number=12421, then return -1 since the number is a palindrome.

When the number = 234382, return 8. Because, if we remove 8 from the number, the number will become palindrome.

Similarly, when number= 91221, return 9.

Also, if the number = 781876, return 6.

``````public class FormPalindrome
{
public static void main(String[] args)
{
System.out.println(formAPalindrome(381483));
System.out.println(formAPalindrome(12121));
System.out.println(formAPalindrome(98118));
System.out.println(formAPalindrome(251532));
}
public static int formAPalindrome(int my_num)
{
String str, str1, str2="";
str=Integer.toString(my_num);
StringBuilder sb=new StringBuilder(str);
str1=sb.reverse().toString();
if(str.equals(str1))
{
return -1;
}
else
{
int num=0;
for(int i=0;i<str.length();i++)
{
str2=str.substring(0, i)+str.substring(i+1);
sb=new StringBuilder(str2);
str1=sb.reverse().toString();
if(str2.equals(str1))
{
num=str.charAt(i)-'0';
break;
}
}
return num;
}
}
}``````

Output