Given a string str, the task is to find whether the string is a palindrome or not in Java without using library methods.
Input: str = “abba”
Input: str = “geeks”
Approach: Take two pointers i pointing to the start of the string and j pointing to the end of the string. Keep incrementing i and decrementing j while i < j and at every step check whether the characters at these pointers are same or not. If not then the string is not a palindrome else it is.
Below is the implementation of the above approach:
Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready.