EPAM Systems Interview Questions, Process, and Tips

Medium level questions

Q1. Find duplicates in a string
Ans. 
Use a hash set to find duplicates in a string efficiently.
• Create a hash set to store characters as you iterate through the string.

• If a character is already in the hash set, it is a duplicate.

• Return the set of duplicates found.
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Q2. Balanced parenthesis
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Q1. Shift related questions
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Q2. Compensation about current company
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Good Programming code simple but complex

Q1. Tell me About yourself
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Q2. Tell me about your framework
Ans. 
My framework is a data-driven automation framework built using Selenium WebDriver and TestNG.
• Built using Selenium WebDriver for web automation

• Utilizes TestNG for test case management and execution

• Follows data-driven approach for test data separation

• Includes reporting features for test result analysis
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Q3. Explain Static keyword in Java
Ans. 
Static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.
• Static variables are shared among all instances of a class.

• Static methods can be called without creating an object of the class.

• Static blocks are used to initialize static variables.

• Static keyword can also be used to create static nested classes.
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Q4. Explain FInal Keyword in java
Ans. 
Final keyword in Java is used to restrict the user from changing the value of a variable, making it a constant.
• Final keyword can be applied to variables, methods, and classes.

• Final variables must be initialized and cannot be reassigned.

• Final methods cannot be overridden in subclasses.

• Final classes cannot be subclassed.
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Q5. Diff between abstract and interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can extend only one abstract class but can implement multiple interfaces.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract for cla...read more
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Q1. Two Sum to a given sum
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Q1. Longest Palindome Substring
Ans. 
Find the longest palindrome substring in an array of strings.
• Iterate through each string in the array

• Check for palindromes within each string

• Keep track of the longest palindrome found
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Q1. How tree set works

Ans. 

Tree set is a sorted set implementation based on a binary search tree.

• Tree set stores elements in sorted order using a binary search tree

• It does not allow duplicate elements

• Operations like add, remove, and search have O(log n) time complexity

• Example: TreeSet treeSet = new TreeSet<>();

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