public class PalindromeString {
public static void main(String args[])
{
Scanner sca =new Scanner(System.in);
System.out.println(" Enter Number or string to check whether it is palindrome");
while (sca.hasNext()){
String input=sca.nextLine();
if(!input.matches("^\\d*$")){ // check for if ( string contain numbers..?)
isPalindrome(input); // call to isPalindrome(String str) method
if(isPalindrome(input)){
System.out.println("you Entered " +input + " is Palindrome ");
}
else{
System.out.println("you Entered " +input + " is NOT Palindrome");
}
}
if( input.matches("^\\d*$")){
// System.out.println("you entered number");
if(isPalindrome(input)){
System.out.println("you Entered " +input + " is Palindrome ");
}
else{
System.out.println("you Entered " +input + " is NOT Palindrome");
}
}
}
}
public static boolean isPalindrome(String str) {
int i;
int n=str.length();
String revstr="";
for(i=n-1;i>=0;i--)
revstr=revstr+str.charAt(i);
if(revstr.equals(str))
return true;
else
return false;
}
public static boolean isPalindrome(int number) {
int palindrome = number; // copied number into variable
int reverse = 0;
while (palindrome != 0) {
int remainder = palindrome % 10;
reverse = reverse * 10 + remainder;
palindrome = palindrome / 10;
}
// if original and reverse of number is equal means
// number is palindrome in Java
if (number == reverse) {
return true;
}
return false;
}
}
Output : Enter Number or string to check whether it is palindrome adi4444ida you Entered adi4444ida is Palindrome
In code
if( input.matches("^\\d*$")) ("^\\d*$")) is regex
You can read more about regex in followiong link.
Know Regex
Play around it
If any problem in code let me know.
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