What is a Palindrome?
A palindrome is a Number/String that is the same after reverse.
Example 1: 5445,6556,455554.
Example 2: mom, repaper, tenet.
Write a program to check the given string palindrome or not?
Solution 1: By using StringBuffer.
public class PalindromeSolution1{
public static void isPalindrome(String paliString) {
/* Here we are reversing string by using StringBuffer API and setting in to
another string.*/
String reversepaliString = new StringBuffer(paliString).reverse().toString();
/*
* Here we are checking both strings equals or not if it's equals
* given string is a Palindrome or else not a Palindrome.
* */
if (paliString.equals(reversepaliString)) {
System.out.println(paliString + " is Palindrome");
} else {
System.out.println(paliString + " is not Palindrome");
}
}
public static void main(String[] args){
isPalindrome("mom");
isPalindrome("repaper");
isPalindrome("clarifyall");
}
}mom is Palindrome
repaper is Palindrome
Solution 2: By using for loop.
public class PalindromeSolution2{
public static void isPalindrome(String paliString) {
String reverseString = "";
/*
* Here we are reversing given string and setting in to anther string
* */
for (int i=paliString.length()-1;i>=0;i--) {
reverseString = reverseString + paliString.charAt(i);
}
/*
* Here we are checked given string and reversed string same or not
* if same given string is palindrome else given string not palondrome.
*/
if (paliString.equalsIgnoreCase(reverseString)) {
System.out.println(paliString+" is palindrome.");
} else {
System.out.println(paliString+" is not palindrome.");
}
}
public static void main(String[] args){
isPalindrome("tenet");
isPalindrome("repaper");
isPalindrome("java");
}
}Output:
tenet is
java is not
