Small Interview Tip

🔹 Small Interview Tip

 
Difference between == and .equals() in Java

You can say:

• == → compares memory address

• .equals() → compares actual value/content

Example:

String a = "hello";
String b = "hello";

System.out.println(a == b);      // may be true
System.out.println(a.equals(b)); // always true

In Java, == does not compare the content of strings.

It compares the memory reference (address) of the objects.
So even if both strings look the same, == will often return false, and your program goes to the else block.
✅ Correct Way
Use .equals() to compare string values.
if(orignal.equals(change)) {
    System.out.println(text + " is a palindrome");
} else {
    System.out.println(text + " is not a palindrome");
}

✔ Corrected Code
public class Palindrome {

    public static void main(String[] args) {

        String text = "level";
        String reverse = "";

        int size = text.length();

        for(int i = 0; i < size; i++) {
            reverse = text.charAt(i) + reverse;
        }

        System.out.println("Reverse String " + reverse);
        System.out.println("Original String " + text);

        String original = text.toUpperCase();
        String change = reverse.toUpperCase();

        if(original.equals(change)) {
            System.out.println(text + " is a palindrome");
        } else {
            System.out.println(text + " is not a palindrome");
        }
    }
}

Output
Reverse String level
Original String level
level is a palindrome