Java program to find a pallindrome

Question

I am a beginner in Java programming. I was a making a program to find if the entered word is a pallindrome or not can someone please tell me the logic i should use to make the given program?

typing that exact question into google gives you plenty of results — UnholySheep, Sep 15 '16 at 14:16
Basically a palindrome is a word where the last character is equal to the first character. The second from the front equals the second from the rear and so on... Do you see the pattern? ;-) — DBX12, Sep 15 '16 at 14:17
You should really try to find a solution first and come back here when you are stuck and need help. For a simple solution try iterating over your input from both directions simultaneously and compare the characters. — Florian Link, Sep 15 '16 at 14:18
The easiest way I can think is to reverse the characters in the word and then compare that to the original word. This post explains how to reverse a word in Java: http://stackoverflow.com/questions/7569335/reverse-a-string-in-java#7569370 — Mike Taverne, Sep 15 '16 at 14:19
boolean isPalindrome = new StringBuilder(input).reverse().toString().equals(input); — Adriaan Koster, Sep 15 '16 at 14:24

Tim Biegeleisen · Accepted Answer · 2016-09-15T14:37:55.417

boolean isPalindrome(String input) {
    for (int i=0; i < input.length() / 2; ++i) {
        if (input.charAt(i) != input.charAt(input.length() - i - 1)) {
            return false;
        }
    }

    return true;
}

This solution is self explanatory, the only edge case requiring explanation is what happens for words with an odd number of letters. For an input containing an odd number of letters, the middle element will not be touched by the loop, which is OK because it has no effect on whether the input is a palindrome.

Java program to find a pallindrome

1 Answers1