Question 1

Where do you see yourself in 5 years?

Accepted Answer

**Sample Answer:**
'In five years, I see myself as a Senior Software Engineer or Engineering Lead. I want to be a domain expert who not only writes robust architecture but also mentors junior developers. I am particularly excited about this role because your company has a strong track record of internal growth, and I believe I can build a long-term career here while taking on increasing responsibilities.'

Question 2

What is an Activity?

Accepted Answer

A single, focused thing that the user can do, which provides a window in which the app draws its UI.

Question 3

What does SEO stand for and why is it important?

Accepted Answer

'SEO stands for Search Engine Optimization. It is the process of improving a website's visibility on search engines like Google. It is crucial because higher ranking leads to more organic, unpaid traffic to the site, which increases brand awareness and potential sales.'

Tip: Mention 'organic traffic' as the key benefit.

Question 4

What is database normalization and what are its different forms? Provide examples.

Accepted Answer

Database normalization is a process used to organize a database into tables and columns to reduce data redundancy and improve data integrity. The main objective is to separate data into different tables and define relationships between them.

### Different Forms of Normalization:
1. First Normal Form (1NF): Ensures that the table has no repeating groups and that all entries are atomic.
2. Second Normal Form (2NF): Achieved when a table is in 1NF and all non-key attributes are fully functional dependent on the primary key.
3. Third Normal Form (3NF): A table is in 2NF and all the attributes are functionally dependent only on the primary key.

### Examples:
```sql
-- Sample table before normalization:
CREATE TABLE Orders (
    OrderID INT,
    ProductName VARCHAR(255),
    CustomerName VARCHAR(255),
    CustomerAddress VARCHAR(255)
);

-- After applying 1NF, separating Customers into a different table:
CREATE TABLE Customers (
    CustomerID INT PRIMARY KEY,
    CustomerName VARCHAR(255),
    CustomerAddress VARCHAR(255)
);

CREATE TABLE Orders (
    OrderID INT PRIMARY KEY,
    ProductName VARCHAR(255),
    CustomerID INT,
    FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
);
```
This example demonstrates normalization by eliminating redundancy and organizing data efficiently. It can handle edge cases like null customer addresses by ensuring proper constraints are applied.

Question 5

What are some common string manipulation techniques in Java? Provide examples of how to reverse a string and check for palindromes.

Accepted Answer

String manipulation is a crucial skill in Java. Below are two common techniques: reversing a string and checking if a string is a palindrome.

1. Reversing a String:
You can reverse a string by converting it to a character array and swapping characters:

```java
public class StringManipulation {
    public static String reverseString(String str) {
        if (str == null || str.isEmpty()) {
            return str;
        }
        StringBuilder reversed = new StringBuilder(str);
        return reversed.reverse().toString();
    }

public static void main(String[] args) {
        System.out.println(reverseString("Hello")); // Output: olleH
        System.out.println(reverseString(""));      // Output: 
        System.out.println(reverseString(null));     // Output: null
    }
}
```

2. Checking for Palindromes:
A palindrome is a string that reads the same forwards and backwards. Here's how you can check for it:

```java
public class PalindromeChecker {
    public static boolean isPalindrome(String str) {
        if (str == null) return false;
        int left = 0, right = str.length() - 1;
        while (left < right) {
            if (str.charAt(left) != str.charAt(right)) {
                return false;
            }
            left++;
            right--;
        }
        return true;
    }

public static void main(String[] args) {
        System.out.println(isPalindrome("racecar")); // Output: true
        System.out.println(isPalindrome("hello"));   // Output: false
        System.out.println(isPalindrome(null));       // Output: false
    }
}
```

In both examples, we handle edge cases such as null and empty string inputs.

SarthiQ

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