033 - For Loop Challenge 2 (optional)

Write code that will take in a String input and check to see if it is a palindrome or not.

 

A palindrome means that the characters are the same forwards and backwards, ignoring spaces.

 

Examples of palindromes:

• racecar

• was it a car or a cat I saw

• never odd or even

• rats live on no evil star

 

Your check should be case insensitive too. For example, "Bob" is a palindrome, despite the first B being capitalized.

 

Your program will print out "true" if it's a palindrome and "false" if not.

 

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Solution

import java.util.Scanner;
 
class Main {
  public static void main(String[] args) {
        Scanner inp = new Scanner(System.in);
        System.out.print("In:");
        String s = inp.nextLine().trim();
        s=s.replaceAll(" ","");//remove space
        s=s.toLowerCase(); //do all the same
        
        boolean flag =true; //true =palindromes false=not palindromes
        int mid=s.length()/2; //search mid
        for(int i=0;i<mid;i++) {
            if(s.charAt(i)!=s.charAt(s.length()-1-i)) {
                flag=false;
            }
        }
           System.out.println(!flag?"false":"true");
      }
    }