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package ae.naveed;

import java.util.Scanner;

public class FindPalindrome {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(;
        char[] inputString = scanner.nextLine().toCharArray();
        int i = 0, j = inputString.length - 1;

        while (j > i ) {
            if (inputString[i] != inputString[j]) {


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@MappedSuperclass vs. @Inheritance

MappedSuperClass must be used to inherit properties, associations, and methods. Entity inheritance must be used when you have an entity, and several sub-entities. You can tell if you need one or the other by answering this questions: is there some other entity in the model which could have an association with the base class? If yes, then the base class is in fact an entity, and you should use entity inheritance. If no, then the base class is in fact a class that contains attributes and methods that are common to several unrelated entities, and you should use a mapped superclass. For example: You can have several kinds of messages: SMS messages, email messages, or phone messages. And a person has a list of messages. You can also have a reminder linked to a message, regardless of the kind of message. In this case, Message is clearly an entity, and entity inheritance must be used. All your domain objects could have a creation date, modification date and ID, and you could thus

Hashmap Keyset and EntrySet difference.

If you're concerned about performance when iterating through your hash map, I suggest you have a look at  LinkedHashMap . From the docs: Iteration over the collection-views of a LinkedHashMap requires time proportional to the size of the map, regardless of its capacity. Iteration over a HashMap is likely to be more expensive, requiring time proportional to its capacity. HashMap.entrySet() The source-code for this implementation is available. The implementation basically just returns a new  HashMap.EntrySet . A class which looks like this: private final class EntrySet extends AbstractSet < Map . Entry < K , V >> { public Iterator < Map . Entry < K , V >> iterator () { return newEntryIterator (); // returns a HashIterator... } // ... } and a  HashIterator  looks like private abstract class HashIterator < E > implements Iterator < E > { Entry < K , V > next ; // next entry to ret